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Small Gas Engine Disassembly Presentation

This presentation provides a step-by-step outline for disassembling a small gas engine. It covers topics such as fuel, sparkplug removal, draining oil, air cleaner removal, blower housing, cylinder head and gasket, flywheel removal, ignition components, carburetor and governor, valve cover, removal of valves, crankcase cover, camshaft removal, extract valve lifters, piston and connecting rod, crankshaft removal, piston ring removal, oil seals, and muffler removal.

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Small Gas Engine Disassembly Presentation

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Presentation Transcript

  1. Start...

  2. Small Gas Engine Disassembly

  3. Presentation Outline: • 1.0 Organization • 2.0 Fuel • 3.0 Sparkplug Removal • 4.0 Draining Oil • 5.0 Air Cleaner Removal

  4. Presentation Outline Continued: • 6.0 Blower Housing • 7.0 Cylinder Head & Gasket • 8.0 Fly Wheel Removal • 9.0 Ignition Components • 10.0 Carburetor & Governor

  5. Presentation Outline Continued: • 11.0 Valve Cover • 12.0 Removal of Valves • 13.0 Crank Case Cover • 14.0 Cam Shaft Removal • 15.0 Extract Valve Lifters

  6. Presentation Outline Continued • 16.0 Piston & Connecting Rod • 17.0 Crankshaft Removal • 18.0 Piston Ring Removal • 19.0 Oil Seals • 20.0 Remove Muffler

  7. Organization • Plastic bags • Card board box • Small cans • Notes

  8. Remove Engine from Implement • Remove blades, belts, etc. • Clean

  9. Fuel • Dump out gas • Check fuel quality • Look for water • Dispose of properly

  10. Sparkplug • Check condition • Oily, black soot • Electrode - tan

  11. Drain Oil • Inspect condition • Proper level • Changed regularly

  12. Air Cleaner • Condition • Changed regularly • Wear parts 10 times faster

  13. Blower Housing • Engine ID numbers • Remove debris • Aids in cooling

  14. Cylinder Head & Gasket • Unbolt cylinder head • Remove head gasket / inspect • Inspect amt. carbon on piston • Clean - warn, dirty - good

  15. Flywheel • Remove starter clutch • Gear puller • Examine fins, key, & key way • Check flywheel for cracks

  16. Ignition Components • Remove condenser & points • Check condition • Remove magneto • Remove electronic ignition

  17. Carburetor & Governor Linkage • Unhook linkages • Draw picture, notes, label • Small parts; plastic bag

  18. Valve Cover • Unbolt valve cover • breather tube • maintain crankcase vacuum

  19. Remove Valves • Valve spring compressor • 2 big flathead screwdrivers • Store springs with valves

  20. Remove Crankcase Cover • Remove rust from PTO shaft • Tap to break gasket seal • Remove any oil pumps / slingers

  21. Remove Camshaft • Locate timing marks • Remove any oil pumps / slingers • Inspect lobes for wear • Wear indicates low oil

  22. Remove Valve Lifters • Exhaust lifter near threaded port • Mark each lifter: tape, paint, grind

  23. Remove Piston & Connecting Rod • Punch marks, mating surfaces • Unbolt connecting rod • Push piston out through top

  24. Remove Crankshaft • Inspect journals • Observe any thrust washers

  25. Remove Piston Rings • Remove piston rings • Check ring gap • Replace if necessary

  26. Oil Seals • Remove seals with screwdriver • Replace if needed

  27. Remove Muffler • Penetrating oil • Heat • Oil filter wrench • Flywheel strap wrench

  28. The End.

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