Re: Head Gasket

Posted by RAB on May 11, 2005 at 14:30:34 from (195.93.21.100):

In Reply to: Re: Head Gasket posted by Don Wadge on May 11, 2005 at 12:15:09:

Just adding to Don"s comments: Are the threads on the new stud/nuts the same as the OEM? Pull down will be different for different thread pitch; As an example to his comment of distortion on over tightening, not so many know that on some old large oil engines, bolts on the big ends were not torqued down to any set value, but tightened as much as necessary to make the bearing circular (either side of ideal would result in a slightly oval bearing), so they were first bench torqued until the bearing became perfectly round then installed to that torque.
Also retightening technique is presumably relaxing one bolt (in the order laid down in the manual), say 90 degrees, and retightening to final torque, then moving on to the next bolt in the sequence.
With regard to surface treatment of gaskets - follow the actual gasket manufacturer instructions/recommendations as you may be wasting your money, if you are not installing it correctly. Good luck.
Regards, RAB

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