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1. 1 09/97 CB-258 LB361 LPG / NH3 Compressor
2. LB361 LPG / NH3 Compressor These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.
3. 3 09/97 CB-258 LB361 LPG / NH3 Compressor The LB361 compressor is suitable for many applications, but the most common is the transfer and vapor recovery of liquefied gases such as propane, butane, and anhydrous ammonia. The non-lubricated cylinder design of the LB361 allows the transfer of these products without contamination of the products and is capable of transferring up to 200 gallons per minute (760 lpm). Typically the LB361 is driven by a 10 or 15 HP driver in the 650 to 800 rpm range. Be sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributorBe sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributor
4. 4 09/97 CB-258 LITERATURE Be sure you have the proper literature before starting work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
Literature is available on the web at:
blackmercompressor.com
or from your Blackmer distributor.
5. 5 09/97 CB-258 Tools The tools normally required for small machine service will be adequate. A small strap wrench is useful as well as a good spanner. The Blackmer spanner p/n 790316 has 1/4” pins and is used for piston removal. A flat scraper and inside snap ring pliers are also needed.
Blackmer offers a complete tool kit which has all of the hand tools necessary to dismantle the machine.
On larger machines a small hoist might be needed for one man to do the job, depending on the environment. Generally, two men can handle the disassembly of any Blackmer machine.
6. 6 09/97 CB-258 Nameplate On the side of every Blackmer compressor is a nameplate which doubles as an access opening for inspecting the piston rod.
The nameplate will show the compressor’s model number, serial number, ID number, and oil capacity.
The compressor ID is a coded number that fully describes the compressor’s construction.
Make certain that you have these identifying numbers when you call your Blackmer distributor for parts or service assistance.
7. 7 09/97 CB-258 LB361 Compressor Blackmer offers a variety of LPG transfer compressors.
The LB362 is similar to the LB361 shown in this presentation but has two seals separated by a distance piece on each piston rod.
Smaller models:
LB161 / LB162 [7.5 bhp (5.5 kw)]
Larger models:
LB601 / LB602 [40 bhp (30 kw)]
LB942 [50 bhp (37 kw)] Blackmer offers a variety of two-stage compressors.
The HDL372 is similar to the HD372 shown in this presentation but is liquid cooled. It has a water cooled head and cylinder for lower metal temperatures and longer life of wearing parts. It is also fitted with a water cooled intercooler to keep gas temperatures at acceptable levels for continuous duty.
The smaller HD172 air-cooled model is rated for 10 bhp (7.5 kw).
The larger HD612 (air-cooled) and HDL612 (liquid cooled) models are rated for 40 bhp (30 kw).Blackmer offers a variety of two-stage compressors.
The HDL372 is similar to the HD372 shown in this presentation but is liquid cooled. It has a water cooled head and cylinder for lower metal temperatures and longer life of wearing parts. It is also fitted with a water cooled intercooler to keep gas temperatures at acceptable levels for continuous duty.
The smaller HD172 air-cooled model is rated for 10 bhp (7.5 kw).
The larger HD612 (air-cooled) and HDL612 (liquid cooled) models are rated for 40 bhp (30 kw).
8. 8 09/97 CB-258 Pressure Gauges Blackmer compressors are typically fitted with a pressure gauge on both the suction and discharge. The gauges are fitted with a pulsation dampener to eliminate much of the vibration of the gauge needle making it easier to read and extending the life of the pressure gauge.
Both suction and discharge pressure gauges should be installed on every compressor.
9. 9 09/97 CB-258 Valve Caps and Hold Down Screws Remove the valve caps to access the valves. Note the metal gasket under each cap; these should be replaced rather than reused.
After the valve caps have been removed, the valve hold down screws can be removed with a 3/8” Allen wrench. To prevent possible damage to the valves during assembly, the hold down screws must be completely removed from the valve cover plates.
10. 10 09/97 CB-258 Valve Cover Plates .
11. 11 09/97 CB-258 Valves With the cover plates removed, the valve spacers, valves and gaskets may be taken out.
A liquid relief device in the suction valve post helps protect the compressor in case liquid enters the cylinder area. It consists of a ball and spring relief valve which will allow liquid to be returned to the suction piping if necessary.
The discharge valve is held in place by a solid post.
Make certain the metal valve gaskets are removed with each valve as they may be difficult to see in the head. The valve gaskets are normally aluminum and must be replaced when the valves are removed.
12. 12 09/97 CB-258 Cylinder Head To remove the cylinder head, unbolt the two center head bolts from the top of the head and the six head bolts from the bottom of the head.
The two center head bolts on models with flat head gaskets have metal gaskets which are normally not reusable.
After the cylinder head bolts have been removed, the head may be lifted from the cylinder.
13. 13 09/97 CB-258 Head Gasket and Piston Nut The LB361 head is sealed to the cylinder with a flat head gasket. Carefully use a flat scraper or putty knife to remove the old gasket material before installing a new one.
The LB361A and LB361B use O-rings to seal the cylinders.
The piston nut is removed with an adjustable spanner. This spanner has two 1/4” pins which fit into holes in the top of the piston nut. Note the nylon locking device on the piston nut.
14. 14 09/97 CB-258 Piston Removal Once the piston nut has been removed, the spanner is used to unscrew the piston from the rod. Under each piston is a thick washer and one, or more, shims. These shims adjust the height of the piston in the cylinder. This is referred to as the “deck height”. Unless a major part has been changed, the deck height should not need adjustment. Changing the piston, crosshead assembly, cylinder body, main bearings or crankshaft may require adjustment of the deck height.
Rotate the crankshaft to bring the other piston to top-dead-center for removal. Each piston is fitted with three piston rings. Each ring has a stainless steel expander between it and the piston. Install each piston ring with the bevel on the inside facing up. The ring and expander gaps should be staggered at 180° intervals during installation.
15. 15 09/97 CB-258 Cylinder With the pistons removed, the cylinder can be unbolted and removed to gain access to the packing boxes. Two O-rings seal the bottom of the cylinder.
Notice the passage in the bottom of the cylinder between the bores. This allows gas to move from one cylinder to the other as the pistons move up and down.
16. 16 09/97 CB-258 Packing Box Removal The packing boxes are secured by a hold down screw which is removed with the same adjustable spanner that was used on the piston nut and piston. Note that the hold down screw also has a nylon insert that keeps it in place.
The packing boxes may now be lifted off the rod. O-rings seal the bottom side of the packing boxes.
17. 17 09/97 CB-258 Packing Box disassembly To remove the seals (packing) from the box:
Remove the top snap ring with a pair of inside snap ring pliers. Depress the spring with a screwdriver handle to make this operation easier.
18. 18 09/97 CB-258 Rod Seals With the snap ring removed, the top washer, spring, middle washer, seal rings, bottom washer and retainer ring can all be removed.
The seal consists of three types of rings. One ring is a male ring, next a series of V-rings, then a female ring.
On LB361 compressors, the spring and male ring will be at the top and the female ring will be at the bottom.
19. 19 09/97 CB-258 Piston Rod Inspection The piston rods and the top on the crossheads are visible through the opening when the nameplate is removed.
The crosshead guide is secured to the crankcase by six bolts.
20. 20 09/97 CB-258 Crankcase and Crosshead With the crosshead guide removed, the crosshead / piston rods are visible. The flat gasket on top of the crankcase may require the use of a flat scraper to remove completely.
The oil dipstick is located in the access cover. On current models, it is located adjacent to the access cover. The oil viscosity and capacity are found in the Instruction Manual.
21. 21 09/97 CB-258 Removal of the crankcase access cover and gasket permits access to the connecting rods. After the bottom cap of the connecting rod has been removed, the piston rod / crosshead and the top half of the connecting rod may be lifted off from above. Crosshead & Connecting Rod Removal
22. 22 09/97 CB-258 The connecting rod and crosshead assembly are separated by removing the wrist pin in a bench press. Note that the wrist pin has a plastic retainer plug on each end.
The piston rod is permanently secured to the crosshead at the factory and no attempt should be made to separate them. Final machining is done to the assembled crosshead / rod which precludes their reassembly once separated. The grooves in the crosshead are lubrication channels.
The small end of the connecting rod has a bronze bushing and is lubricated via and internal port running the length of the connecting rod. Crosshead and Connecting Rod
23. 23 09/97 CB-258 Crosshead and Connecting Rod (cont’d) A precision insert split shell bearing is located at the big [journal] end. Tabs on the bearing shells fit into slots in the rod and bearing cap. These retain the shells and align the oil feed holes.
The LB361 uses a bronze bushing on a steel wrist pin at the small end of the conrod. The oil admission hole in the bearing or bushing must align with the oil supply hole in the connecting rod small end. When the bronze wrist pin bushing is replaced, it must be honed to final dimension after being pressed into the connecting rod
The rod and cap are matched sets, do not mix. Match marks must align when assembling bearing cap to connecting rod.
24. 24 09/97 CB-258 The oil pressure adjustment screw includes an O-ring, lock nut, spring and ball. Turn the screw inward (clockwise) to increase the oil pressure setting.
The oil pickup tube with washers, O-ring and strainer fits in the crankcase under the bearing carrier. If any foreign material is noticed in the strainer, its source should be quickly identified to prevent reoccurrence of the problem.
The pipe plug next to the oil pickup tube opening is the crankcase oil drain.
Some units will be fitted with an external oil filter (not shown). Oil Pressure adjustment, Strainer
25. 25 09/97 CB-258 Oil Pump This photo shows the oil pump used in the LB361 and LB361A. The LB361B uses a different pump.
Remove the oil pump cover and O-ring to withdraw the oil pump. Notice the small O-ring on the pump shaft and the bronze bushing in the bearing carrier.
The oil pump cover can be installed with either left or right rotation arrow visible. When installing the cover, make sure that the arrow at the TOP of the cover indicates the desired rotation direction.
26. 26 09/97 CB-258 The photo shows the bearing carrier / oil pump used in the LB361 and LB361A. The LB361B uses a different style.
The entire bearing carrier / oil pump assembly, with gasket, can be removed intact. This allows the crankshaft to be removed.
Note the slot in the end of the oil pump drive shaft. This slot must align with the drive tang in the end of the crankshaft during installation. Bearing Carrier
27. 27 09/97 CB-258 Remove the crosshead and connecting rod assemblies to proceed with the crankshaft removal. Notice the lubrication holes on the bearing journals. Also note the spray nozzles on the crankshaft. The spray nozzles lubricate the crosshead guide and the main [ roller ] bearings.
The top of the crankcase is fitted with a breather which prevents entry of foreign material into the crankcase but allows the release of crankcase pressure. Crankshaft Removal
28. 28 09/97 CB-258 The bearing cover plate is on the flywheel side of the crankcase. Behind this plate are a series of shims which adjust the preload on the main bearings. These shims are normally reusable and the shim thickness will not have to be adjusted unless the crankshaft and / or main bearings are replaced. The bearing cover plate also contains a crankshaft oil seal. Bearing Cover Plate xx
29. End of Presentation These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.
30. LB361 LPG / NH3 Compressor These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.
31. 31 09/97 CB-258 LB361 LPG / NH3 Compressor Liquid transfer / vapor recovery of:
propane
butane
anhydrous ammonia
Transfer without contamination
Up to 200 GPM
(760 lpm)
Usually driven by 10 or 15 HP driver at 650 to 800 rpm
Be sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributorBe sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributor
32. 32 09/97 CB-258 LITERATURE Have the proper literature at hand
Parts lists
Installation, Operation and Maintenance manual
For literature:
blackmercompressor.com
Call your Blackmer distributor Be sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributorBe sure that you have the literature you require before starting to work on the compressor. Locate the parts list and Installation, Operation and Maintenance instructions. In addition, you may have received additional instruction sheets with your machine that further describe such items as valves and packing.
If you do not have all of the necessary information, call your Blackmer distributor
33. 33 09/97 CB-258 Tools Use standard tools for small machines
Blackmer adjustable spanner with 1/4” pins (p/n 790316)
Inside snap ring pliers
Blackmer tool kit available Blackmer offers a complete tool kit which has all of the hand tools necessary to dismantle the machine.
The tools normally required for small machine service will be adequate for the work on an HD compressor. A small strap wrench is useful and a good spanner. The Blackmer p/n 790535 spanner is used for valve hold down screws. The Blackmer spanner p/n 790316 has 1/4” pins and is used for piston removal. A flat scraper and inside snap ring pliers are also needed.
On larger machines a small hoist might be needed for one man to do the job, depending on the environment. Generally, two men can handle the disassembly of any Blackmer machine.Blackmer offers a complete tool kit which has all of the hand tools necessary to dismantle the machine.
The tools normally required for small machine service will be adequate for the work on an HD compressor. A small strap wrench is useful and a good spanner. The Blackmer p/n 790535 spanner is used for valve hold down screws. The Blackmer spanner p/n 790316 has 1/4” pins and is used for piston removal. A flat scraper and inside snap ring pliers are also needed.
On larger machines a small hoist might be needed for one man to do the job, depending on the environment. Generally, two men can handle the disassembly of any Blackmer machine.
34. 34 09/97 CB-258 Nameplate Model number
Serial number
I.D. number
Defines construction
Oil capacity
Rod inspection access On the side of every Blackmer compressor is a nameplate which doubles as an access opening for inspecting the piston rod.
The nameplate will show the compressor’s model number, serial number, ID number, and oil capacity.
The compressor ID is a coded number that fully describes the compressor’s construction.
Make certain that you have these identifying numbers when you call your Blackmer distributor for parts or service assistance.
On the side of every Blackmer compressor is a nameplate which doubles as an access opening for inspecting the piston rod.
The nameplate will show the compressor’s model number, serial number, ID number, and oil capacity.
The compressor ID is a coded number that fully describes the compressor’s construction.
Make certain that you have these identifying numbers when you call your Blackmer distributor for parts or service assistance.
35. 35 09/97 CB-258 LB361 Compressor Other Models Available:
LB161/162
[7.5 bhp (5.5 kw)]
LB362 double-seal
LB601 / LB602 [40 bhp (30 kw)]
LB942 [50 bhp (37 kw)] Blackmer offers a variety of two-stage compressors.
The HDL372 is similar to the HD372 shown in this presentation but is liquid cooled. It has a water cooled head and cylinder for lower metal temperatures and longer life of wearing parts. It is also fitted with a water cooled intercooler to keep gas temperatures at acceptable levels for continuous duty.
The smaller HD172 air-cooled model is rated for 10 bhp (7.5 kw).
The larger HD612 (air-cooled) and HDL612 (liquid cooled) models are rated for 40 bhp (30 kw).Blackmer offers a variety of two-stage compressors.
The HDL372 is similar to the HD372 shown in this presentation but is liquid cooled. It has a water cooled head and cylinder for lower metal temperatures and longer life of wearing parts. It is also fitted with a water cooled intercooler to keep gas temperatures at acceptable levels for continuous duty.
The smaller HD172 air-cooled model is rated for 10 bhp (7.5 kw).
The larger HD612 (air-cooled) and HDL612 (liquid cooled) models are rated for 40 bhp (30 kw).
36. 36 09/97 CB-258 Pressure Gauges
Always install!
Suction & Discharge
Pulsation dampener- extends gauge life & makes it easier to read. Optional suction valve unloaders allow the compressor to be deactivated in service. That is, gas that is drawn into the cylinder during the suction stroke is expelled through the suction valve on the discharge stroke and does not pas through the machine into the discharge line. This is accomplished by holding the compressor suction valve plates open throughout the full cycle. The unloader mechanism does this mechanically and can be powered by compressed gas from the discharge storage or an independent source, as required.
The suction valves can be unloaded to produce no-load starts or reduced capacity operation on demand. Optional suction valve unloaders allow the compressor to be deactivated in service. That is, gas that is drawn into the cylinder during the suction stroke is expelled through the suction valve on the discharge stroke and does not pas through the machine into the discharge line. This is accomplished by holding the compressor suction valve plates open throughout the full cycle. The unloader mechanism does this mechanically and can be powered by compressed gas from the discharge storage or an independent source, as required.
The suction valves can be unloaded to produce no-load starts or reduced capacity operation on demand.
37. 37 09/97 CB-258 Valve Caps and Hold Down Screws Cap gasket (metal)
Remove screws with 3/8” Allen wrench
Remove screw completely from cap! Remove the valve caps to access the valves.
After the valve caps have been removed, the valve hold down screws can be removed with a spanner wrench (such as a Blackmer p/n 790535).
To prevent possible damage to the valves during reassembly, the hold down screws must be completely removed from the valve cover plates.
Note the O-ring under each cap; these should be replaced rather than reused. The compressor I.D. number on the nameplate contains a code for the O-ring material usedRemove the valve caps to access the valves.
After the valve caps have been removed, the valve hold down screws can be removed with a spanner wrench (such as a Blackmer p/n 790535).
To prevent possible damage to the valves during reassembly, the hold down screws must be completely removed from the valve cover plates.
Note the O-ring under each cap; these should be replaced rather than reused. The compressor I.D. number on the nameplate contains a code for the O-ring material used
38. 38 09/97 CB-258 Valve Cover Plates .
39. 39 09/97 CB-258 Valves Valve Spacers
Liquid relief device - ball & spring
Post
Valves
Valve gaskets - usually aluminum
Always replace gaskets Once the cover plates removed, the valve cage, valve and gasket may be taken out.
Make certain the valve gaskets are removed with each valve. When they are left in the head they may be difficult to see. The valve gaskets are normally iron although other materials are used as required. Valve gaskets should be replaced when the valves are removed.Once the cover plates removed, the valve cage, valve and gasket may be taken out.
Make certain the valve gaskets are removed with each valve. When they are left in the head they may be difficult to see. The valve gaskets are normally iron although other materials are used as required. Valve gaskets should be replaced when the valves are removed.
40. 40 09/97 CB-258 Cylinder Head Two center head bolts have metal gaskets
(LB361 only)
Six bolts from the bottom To remove the cylinder head, unbolt the two center head bolts from the top of the head and the eight head bolts from the bottom of the head. After the cylinder head bolts have been removed, the head may be lifted from the cylinder. Note that the head is sealed to the cylinder by an O-ring at each cylinder bore.To remove the cylinder head, unbolt the two center head bolts from the top of the head and the eight head bolts from the bottom of the head. After the cylinder head bolts have been removed, the head may be lifted from the cylinder. Note that the head is sealed to the cylinder by an O-ring at each cylinder bore.
41. 41 09/97 CB-258 Head Gasket and Piston Nut Head Gasket (LB361)
O-Ring
(LB361A & LB361B)
Remove old gasket material!
Remove piston nut with 1/4” pin spanner
Piston nut has nylon locking insert The piston nut is removed with an adjustable spanner. This spanner has two 1/4” pins which fit into holes in the top of the piston nut. Note the nylon locking device on the piston nut.
Once the piston nut has been removed, the same spanner can be used to unscrew the piston from the rod. There is a thick washer under each piston and one, or more, shims. These shims adjust the height of the piston in the cylinder. This is referred to as the “deck height”. Unless a major part has been changed, the deck height should not need adjustment. Change of the piston, crosshead assembly, cylinder body, main bearings or crankshaft may require adjustment of the deck height.
Rotate the crankshaft to bring the other piston to top-dead-center for removal. Each piston is fitted with three piston rings. Each ring has a stainless steel expander between it and the piston.The piston nut is removed with an adjustable spanner. This spanner has two 1/4” pins which fit into holes in the top of the piston nut. Note the nylon locking device on the piston nut.
Once the piston nut has been removed, the same spanner can be used to unscrew the piston from the rod. There is a thick washer under each piston and one, or more, shims. These shims adjust the height of the piston in the cylinder. This is referred to as the “deck height”. Unless a major part has been changed, the deck height should not need adjustment. Change of the piston, crosshead assembly, cylinder body, main bearings or crankshaft may require adjustment of the deck height.
Rotate the crankshaft to bring the other piston to top-dead-center for removal. Each piston is fitted with three piston rings. Each ring has a stainless steel expander between it and the piston.
42. 42 09/97 CB-258 Piston Removal Use spanner to unscrew piston
Washer and shims adjust piston deck height
Piston rings have expanders
Bevel on inside of the ring faces up
Install rings and expanders with staggered gaps The piston nut is removed with an adjustable spanner. This spanner has two 1/4” pins which fit into holes in the top of the piston nut. Note the nylon locking device on the piston nut.
Once the piston nut has been removed, the same spanner can be used to unscrew the piston from the rod. There is a thick washer under each piston and one, or more, shims. These shims adjust the height of the piston in the cylinder. This is referred to as the “deck height”. Unless a major part has been changed, the deck height should not need adjustment. Change of the piston, crosshead assembly, cylinder body, main bearings or crankshaft may require adjustment of the deck height.
Rotate the crankshaft to bring the other piston to top-dead-center for removal. Each piston is fitted with three piston rings. Each ring has a stainless steel expander between it and the piston.The piston nut is removed with an adjustable spanner. This spanner has two 1/4” pins which fit into holes in the top of the piston nut. Note the nylon locking device on the piston nut.
Once the piston nut has been removed, the same spanner can be used to unscrew the piston from the rod. There is a thick washer under each piston and one, or more, shims. These shims adjust the height of the piston in the cylinder. This is referred to as the “deck height”. Unless a major part has been changed, the deck height should not need adjustment. Change of the piston, crosshead assembly, cylinder body, main bearings or crankshaft may require adjustment of the deck height.
Rotate the crankshaft to bring the other piston to top-dead-center for removal. Each piston is fitted with three piston rings. Each ring has a stainless steel expander between it and the piston.
43. 43 09/97 CB-258 Cylinder
Two O-rings seal the cylinder to the crankcase
Under-piston channel between bores When installing he piston rings and expanders make sure that each piston ring is installed with its gap 1800 from the expander gap. Also, the piston ring gaps should be staggered around the piston.
With the pistons removed, the cylinder can be unbolted and removed to gain access to the packing boxes. Two O-rings seal the bottom of the cylinder.
Notice the passage in the bottom of the cylinder between the bores. This allows gas to move from one cylinder to the other as the pistons move up and down.When installing he piston rings and expanders make sure that each piston ring is installed with its gap 1800 from the expander gap. Also, the piston ring gaps should be staggered around the piston.
With the pistons removed, the cylinder can be unbolted and removed to gain access to the packing boxes. Two O-rings seal the bottom of the cylinder.
Notice the passage in the bottom of the cylinder between the bores. This allows gas to move from one cylinder to the other as the pistons move up and down.
44. 44 09/97 CB-258 Packing Box Removal Remove hold down screw with spanner
Hold down screw has nylon locking insert
O-rings seal bottom of packing box The packing boxes are secured by a hold down screw which is removed with the same adjustable spanner that was used on the piston nut and piston. Note that the hold down screw also has a nylon insert that keeps it in place.
The packing boxes may now be lifted off the rod. O-rings seal the top and bottom side of the packing boxes.The packing boxes are secured by a hold down screw which is removed with the same adjustable spanner that was used on the piston nut and piston. Note that the hold down screw also has a nylon insert that keeps it in place.
The packing boxes may now be lifted off the rod. O-rings seal the top and bottom side of the packing boxes.
45. 45 09/97 CB-258 Packing Box disassembly Depress spring with screwdriver
Remove retainer ring with inside snap ring pliers Remove the seals ( packing ) from the box as follows.
Use a pair of inside snap ring pliers to remove the top snap ring. A screwdriver handle can be used to depress the spring to make this operation easier.
Turn the packing box over to remove the bottom seal.Remove the seals ( packing ) from the box as follows.
Use a pair of inside snap ring pliers to remove the top snap ring. A screwdriver handle can be used to depress the spring to make this operation easier.
Turn the packing box over to remove the bottom seal.
46. 46 09/97 CB-258 Rod Seals Female packing ring on bottom
“V” - ring type
Male packing ring on top
Spring is on top of the packing With the snap ring removed, the top washer, the spring, the middle washer, the seal, the bottom washer and retainer ring can all be removed.
The seal consists of three types of rings. One ring is a male ring, next a series of V-rings, then a female ring.
The upper and lower seals are the same. The seal orientation will depend on the operating pressures. The spring and washer, however, always press against the male ring.
The red oil deflector ring fits on the piston rod between the two seals. The holes in the side of the packing box allow the oil deflector ring to be guided onto the rod as the box is installed.With the snap ring removed, the top washer, the spring, the middle washer, the seal, the bottom washer and retainer ring can all be removed.
The seal consists of three types of rings. One ring is a male ring, next a series of V-rings, then a female ring.
The upper and lower seals are the same. The seal orientation will depend on the operating pressures. The spring and washer, however, always press against the male ring.
The red oil deflector ring fits on the piston rod between the two seals. The holes in the side of the packing box allow the oil deflector ring to be guided onto the rod as the box is installed.
47. 47 09/97 CB-258 Piston Rod Inspection Piston rods and tops of the crossheads are visible through the nameplate opening The piston rods and the top on the crossheads are visible through the opening when the nameplate is removedThe piston rods and the top on the crossheads are visible through the opening when the nameplate is removed
48. 48 09/97 CB-258 Crankcase and Crossheads Gasket between crankcase and guide
Oil level dipstick By removing the crosshead guide, access is given to the crosshead / piston rods.
The flat gasket that fits on top of the crankcase may require the use of a flat scraper to remove completely.By removing the crosshead guide, access is given to the crosshead / piston rods.
The flat gasket that fits on top of the crankcase may require the use of a flat scraper to remove completely.
49. 49 09/97 CB-258 Access cover and gasket
Remove lower bearing caps, lift crosshead and connecting rod assembly Crosshead & Connecting Rod Removal The oil dipstick is located adjacent to the access cover. In earlier models, it was located in the access cover. The oil viscosity and capacity are found in the Instruction Manual.
Removal of the crankcase access cover and gasket permits access to the connecting rods. After the bottom cap of the connecting rod has been removed, the piston rod / crosshead and the top half of the connecting rod may be lifted off from above.The oil dipstick is located adjacent to the access cover. In earlier models, it was located in the access cover. The oil viscosity and capacity are found in the Instruction Manual.
Removal of the crankcase access cover and gasket permits access to the connecting rods. After the bottom cap of the connecting rod has been removed, the piston rod / crosshead and the top half of the connecting rod may be lifted off from above.
50. 50 09/97 CB-258 Plastic retainer plugs
Connecting rod has cast-in oil channel, big end to small end
Connecting rod is Ductile Iron
Cast iron crosshead
Don’t remove piston rod from crosshead Crosshead and Connecting Rod The connecting rod and crosshead assembly are separated by removing the wrist pin in a bench press. Note that the wrist pin has a plastic retainer plug on each end.
The piston rod is permanently secured to the crosshead at the factory and no attempt should be made to separate them. Final machining is done to the assembled crosshead / rod which precludes their reassembly once separated. The grooves in the crosshead are lubrication channels.
The small end of the connecting rod shown here has a bronze bushing. This is used on some models. Current production for the HD362, 342 and 372 incorporates a steel needle bearing in the connecting rod small end.The connecting rod and crosshead assembly are separated by removing the wrist pin in a bench press. Note that the wrist pin has a plastic retainer plug on each end.
The piston rod is permanently secured to the crosshead at the factory and no attempt should be made to separate them. Final machining is done to the assembled crosshead / rod which precludes their reassembly once separated. The grooves in the crosshead are lubrication channels.
The small end of the connecting rod shown here has a bronze bushing. This is used on some models. Current production for the HD362, 342 and 372 incorporates a steel needle bearing in the connecting rod small end.
51. 51 09/97 CB-258 Crosshead and Connecting Rod (cont’d) Wrist pin is pressed into the crosshead
Wrist pin bushing is pressed in and honed to the proper bore
Bushing oil hole must align with connecting rod feed hole
Split bearings on the crankend
Keep rod caps on the correct rod - use match marks The ductile iron connecting rod has a cast in tube to route oil from the big end to the wrist pin.
A precision insert split shell bearing is located at the big [journal] end. Tabs on the bearing shells fit into slots in the rod and bearing cap. These retain the shells and align the oil feeds.
The HD372A uses a bronze bushing on a steel wrist pin at the small end of the conrod. A steel needle bearing is used on some models. The oil admission hole in the bearing or bushing must align with the oil supply hole in the connecting rod small end. When the bronze wrist pin bushing is replaced, it must be honed to final dimension after being pressed into the connecting rod
The rod and cap are matched sets, do not mix. Match marks must align when assembling bearing cap to connecting rod.The ductile iron connecting rod has a cast in tube to route oil from the big end to the wrist pin.
A precision insert split shell bearing is located at the big [journal] end. Tabs on the bearing shells fit into slots in the rod and bearing cap. These retain the shells and align the oil feeds.
The HD372A uses a bronze bushing on a steel wrist pin at the small end of the conrod. A steel needle bearing is used on some models. The oil admission hole in the bearing or bushing must align with the oil supply hole in the connecting rod small end. When the bronze wrist pin bushing is replaced, it must be honed to final dimension after being pressed into the connecting rod
The rod and cap are matched sets, do not mix. Match marks must align when assembling bearing cap to connecting rod.
52. 52 09/97 CB-258 Oil pressure adjustment screw and lock nut
Clean the oil strainer
Oil drain plug
External oil filter on some units Oil Pressure adjustment, Strainer The oil pressure adjustment screw complete with O-ring, lock nut, spring and ball fits into the bearing carrier. Turning the screw inward (clockwise) increases the oil pressure setting.
The oil pickup tube with washers, O-ring and strainer fits in the crankcase under the bearing carrier. If any foreign material is noticed in the strainer, its source should be quickly identified to prevent reoccurrence of the problem.
The pipe plug next to the oil pickup tube opening is the crankcase oil drain.The oil pressure adjustment screw complete with O-ring, lock nut, spring and ball fits into the bearing carrier. Turning the screw inward (clockwise) increases the oil pressure setting.
The oil pickup tube with washers, O-ring and strainer fits in the crankcase under the bearing carrier. If any foreign material is noticed in the strainer, its source should be quickly identified to prevent reoccurrence of the problem.
The pipe plug next to the oil pickup tube opening is the crankcase oil drain.
53. 53 09/97 CB-258 Oil Pump (LB361 & LB361A) May be installed for either rotation direction
The top arrow indicates rotation direction
Rotate cover 180° for opposite rotation direction This photo shows the oil pump used in the HD372A. Models HD372B and HD372C use a different pump.
Remove the oil pump cover and O-ring to withdraw the oil pump. Notice the small O-ring on the pump shaft and the bronze bushing in the bearing carrier.
The oil pump cover can be installed with either left or right rotation arrow visible. When installing the cover, make sure that the arrow at the TOP of the cover indicates the desired rotation direction.This photo shows the oil pump used in the HD372A. Models HD372B and HD372C use a different pump.
Remove the oil pump cover and O-ring to withdraw the oil pump. Notice the small O-ring on the pump shaft and the bronze bushing in the bearing carrier.
The oil pump cover can be installed with either left or right rotation arrow visible. When installing the cover, make sure that the arrow at the TOP of the cover indicates the desired rotation direction.
54. 54 09/97 CB-258 Carrier and oil pump are removed as an assembly
Slot in carrier fits into tang at crankshaft end Bearing Carrier (LB361 & LB361A) The entire bearing carrier / oil pump assembly, with gasket, can be removed intact. This allows the crankshaft to be removed.
Note the slot in the end of the oil pump drive shaft. This slot must align with the drive tang in the end of the crankshaft during installation.The entire bearing carrier / oil pump assembly, with gasket, can be removed intact. This allows the crankshaft to be removed.
Note the slot in the end of the oil pump drive shaft. This slot must align with the drive tang in the end of the crankshaft during installation.
55. 55 09/97 CB-258 Pressure lubrication holes at the journal bearings
Oil spray nozzles on the crankshaft for the crossheads
Crankcase breather vent Crankshaft Removal Remove the crosshead and connecting rod assemblies to proceed with the crankshaft removal. Notice the lubrication holes on the bearing journals. Also note the spray nozzles on the crankshaft. The spray nozzles lubricate the crosshead guide and the main [ roller ] bearings.
The top of the crankcase is fitted with a breather which prevents entry of foreign material into the crankcase but allows the release of crankcase pressure.Remove the crosshead and connecting rod assemblies to proceed with the crankshaft removal. Notice the lubrication holes on the bearing journals. Also note the spray nozzles on the crankshaft. The spray nozzles lubricate the crosshead guide and the main [ roller ] bearings.
The top of the crankcase is fitted with a breather which prevents entry of foreign material into the crankcase but allows the release of crankcase pressure.
56. 56 09/97 CB-258 Located at flywheel end
Shims adjust main bearing preload
Cover contains crankshaft oil seal Bearing Cover Plate The bearing plate cover is on the flywheel side of the crankcase. Behind this plate are shims which adjust the preload on the main bearings. These shims are normally reusable and the shim thickness will not have to be adjusted unless the crankshaft or main bearings are replaced.
The bearing cover plate also contains a crankshaft oil seal.The bearing plate cover is on the flywheel side of the crankcase. Behind this plate are shims which adjust the preload on the main bearings. These shims are normally reusable and the shim thickness will not have to be adjusted unless the crankshaft or main bearings are replaced.
The bearing cover plate also contains a crankshaft oil seal.
57. End of Presentation These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.These slides give a simplified description of the disassembly of a Blackmer HD372A.
The current production model is HD372C. Significant changes are needle bearings at the wrist pin, a larger wrist pin [ 1” instead of 7/8”] and a full-flow, spin-on, oil filter as standard equipment.
With some unimportant differences, this presentation is also appropriate for the other Blackmer 1 and 2 stage models, with the exception of the HD942, double-acting compressor.
