helicoil installation on mb gpw l134 block. i had a miss, possible valve sticking, or worse, in my...
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![Page 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/1.jpg)
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.
![Page 2: 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/2.jpg)
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.
![Page 3: 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/3.jpg)
Tap the hole for new threads using the tap from the Helicoil kit
![Page 4: 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/4.jpg)
Vacuum filings out. You might want to cover the chambers and valves with masking tape
![Page 5: 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/5.jpg)
355699-S ½-13X 2-1/4 Hex hd. Screw-diff, bearing cap screw Willys part 636527
Parts list ¼ ton 4X4Ford Motor Company April 1942
Head takes23/32 wrench, Shank is ½”,13 threads per inch38 Lbs dry31 lbs wet TM = 40 lbs
Torque for Diff cap screw
![Page 6: 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,](https://reader036.vdocuments.us/reader036/viewer/2022062519/5697bf901a28abf838c8dbae/html5/thumbnails/6.jpg)