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Mart · 04-02-2026, 02:50 AM

My experience is that the locking mechanism on the threads loses effectiveness when the bolt is too far in or too far out. There is a part in the middle of the bolt with no threads. The bolt gets crushed during manufacture to create a mismatch between the upper and lower threads. If the crushed part is not well within the threaded part of the lifter body the bolt will not be tight. If the bolt is too far in the head of the bolt can be skimmed on the lathe. If too far out some sort of thin lock nut could be employed.
I try not to adjust them too often.
Unfortunately all the above would require head / valve removal.
So with all that said, maybe some loctite would be a good idea!

Mart.

04-02-2026, 02:50 AM	#7
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,240	Re: Lifter won't stay in adjustment. My experience is that the locking mechanism on the threads loses effectiveness when the bolt is too far in or too far out. There is a part in the middle of the bolt with no threads. The bolt gets crushed during manufacture to create a mismatch between the upper and lower threads. If the crushed part is not well within the threaded part of the lifter body the bolt will not be tight. If the bolt is too far in the head of the bolt can be skimmed on the lathe. If too far out some sort of thin lock nut could be employed. I try not to adjust them too often. Unfortunately all the above would require head / valve removal. So with all that said, maybe some loctite would be a good idea! Mart.