Quote:
Originally Posted by Henry Schmidt
When the #8 main bearing leaks it can be caused by one or both of two issues.
When the leak occurs on a fresh engine quite often the case journal that holds the bearing is out of round. I've measured ovality over .015". The bearing seals by compressing an o-ring and because this area is under pressure, a standard o-ring (unassisted) is incapable of sealing with this kind of tolerance. This ovality is the reason why (after years of resisting) we started using ThreeBond 1211 in the #8 journal.
The second issue, the most common on an engine with higher mileage is a compressed and hardened o-ring. After the engine has heat cycled and sat year in and year out the o-ring under compression takes a set, hardens and fails.
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Is the Threebond 1211 used just on the o ring or is the entire #8 bearing given a thin covering?
thanks