Quote:
Originally Posted by WERK I
How serious is the leak? Is it possible to clean the area above the cover with alcohol and run the engine to check if the area is oily?
Henry, are you suggesting the pressurized oil on #8 is going down in an area behind the intermediate shaft cover and then forced out indicating a bad case sealing?
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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.