<VV> Oil Pressure Release Valve

[Bryan Blackwell]

That's the oil cooler bypass valve.  It opens if the oil is too thick to pass through the cooler, or the cooler is plugged.  It could be a clue, but I can't see how it could be a cause.

--Bryan

On Aug 29, 2011, at 1:29 PM, Brian wrote:

> A friend's recently rebuilt 102 HP engine lasted only 149 miles before destroying at least one rod bearing.  In the post mortem tear down, it was discovered that the pressure relief vale in the rear cover was stuck in the open(/) down position.  (See Item 11 of the oil system diagram in  the 1965 shop manual.) What is the purpose of this valve?  What happens if it is stuck in the down position.  Could there be any tie in to the failed rod bearing? P.S. There may be more than one failed bearing--the others not yet removed.