Don't let this be a headache.

Don’t let this be a headache.

The question is should you tighten the engine head of your jeep?
A question came up on one of the threads on whether “the manuals” tell you to tighten the head more than once.

It depends on which TM you look at. Maybe tightening the head more then once after installation was a common knowledge then for 1940s mechanics? At any rate, you have to have more than one manual with these jeeps. I found the answer on page 69, No. 18, TM 37-2810, March 1945.

“Caution: Cylinder heads should not ordinarily be tightened unless there is a definite indication of looseness or leaks. If tightening is necessary, use a torque-indicating wrench and tighten in the sequence and to the tension specified in the vehicle Technical Manual. When a new gasket is installed, tighten three times as follows: First, upon installation, second, after engine is warmed up, and third, after completing final road test.”

For the WW2 jeep you would follow the pattern as indicated in the graphic below:

 

headseq

 

See Cylinder Head Tightening Chart for more info.

From TM 9-803 Willys Overland Model MB and Ford Model GPW 1/4 Ton 4×4 Technical Manual .

 

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