Helicoil installation on MB GPW L134 block.

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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.
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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.
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Tap the hole for new threads using the tap from
the Helicoil kit
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Vacuum filings out. You might want to cover the
chambers and valves with masking tape
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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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