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Helicoil installation on MB GPW L134 block.

Helicoil installation on MB GPW L134 block.

bruce-ellis
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Helicoil installation on MB GPW L134 block.

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  1. Helicoil installation on MB GPW L134 block. I had a miss, possible valve sticking, or worse, in my engine. The middle head bolt on the left hand side, in front of the carburetor, would not seat and would just rotate. A new bolt took to the treads but could not be torqued down. I removed the head and discovered the gasket at the non-seating head bolt was firing across the gasket to the middle two chambers. The treads in the block for the head bolt were gone. I took a good head bolt to the local auto parts store and got a 7/16 Helicoil kit. The kit does not come with a drill bit but the tap indicates the drill required. I drilled the hole and recommend using the head back in place to guide the drill. The drill went down freely over 1-3/4 deep into the water jacket. I tapped the drilled hole and the tap stopped at 3/8’ deep like the casing wall was preventing it from going further. On the day I had everything ready to assemble, I sprayed my gasket with copper coat and put it aside. I applied gasket sealant to the helicoil as advised, to seal the water jacket. Placed it in the hole and could only get it down 3/8”. The directions say the top of the helicoil must be ¼ -1/2 turn below the top of the hole. I had to remove it with effort. An hour and half of stooge confusion reigned until I retried the tap and forced tapping in 1inch depth. After that, everything went well in the 92 degree Virginia weather. Check the depth - what appears to be the bottom or a stop with the tap may not be.

  2. Drill out the hole using a 29/64 size drill or whatever the kit states. Kit ID# is HC 5521-7 Recommend placing head down as guide to ensure a straight cut.

  3. Tap the hole for new threads using the tap from the Helicoil kit

  4. Vacuum filings out. You might want to cover the chambers and valves with masking tape

  5. Torque for Diff cap screw 355699-S ½-13X 2-1/4 Hex hd. Screw-diff, bearing cap screw Willys part 636527 Head takes 23/32 wrench, Shank is ½”, 13 threads per inch 38 Lbs dry 31 lbs wet TM = 40 lbs Parts list ¼ ton 4X4 Ford Motor Company April 1942

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