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post #189 of (permalink) Old 07-05-2017, 07:48 AM Thread Starter
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Join Date: Feb 2012
Location: Western, MD USA
Posts: 625
Originally Posted by GregSef View Post
If a liner has turned or popped up even a little with liner o-rings that have been in the engine for any length of time you have to replace that O-ring. The O rings harden and take on all the imperfections that they seat on. Change its seating position and they don't seal. Any time they are disturbed its over.

I had to pull a motor and change the O-rings the day before a race weekend to learn this.

Its way to easy to revolve a motor while you are breaking it down. So now the minute a head comes off the hold downs go on. If your not sure which liners moved then they all should be changed.

Thanks, Greg. I'm the type of person that really just was going to replace them either way. I don't want the smallest thing to be detrimental just because I was being lazy.
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