Quote:
Originally Posted by piper6909
This is what I love about forums (forii?) like this where people can share their experiences, albeit some more extensive than others. I can't speak for anti-seize on lug nuts, because I never used it and never will. And I may not have much experience on porsches, but I have some experience on Subarus. And on the only two occasions where I used assembly Lube on head bolt threads I had to redo each of them within a year. One was a personal vehicle and the other one was a friend's vehicle, and both times the head bolts came off extremely easily. Was it a coincidence? I don't think so. They either came loose or I over torqued them beyond their limit. They are torque to yield bolts where you turn them of total of 180° Beyond a specified torque. Whatever happened, I'm never going to use assembly Lube on the threads again. Chase them, of course, if they feel like they're binding, and make sure the threads are clean, but no more assembly Lube for me..
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A personal choice...............
There are also several articles that list potential reasons why Subaru head bolts are known to come loose, running from the head gaskets themselves, weak or incorrect bolts that fatigue, to incorrect tightening sequences, and even mention lack of lubrication causing the bolts to bind during installation, leading to lower than expected clamping, not unlike what is described in the ARP white paper.
The problems seems well recognized, if not fully studied.
Threaded Mode
