oil pressure relief valve

[chas52]

anyone heard of a valve getting stuck open to keep pressure from getting high enough to keep lifters full at highway speeds? if so who sells parts and also who sells a mech oil press guage as the westach unit i have sucks and is on its third sending unit. any guages that match the ones for our counsoles?

 

[earlbrown]

If it was stuck in the open position you should be rattling like hell at idle and quieter at cruising speed.
It's easy enough to check. Just get a 1" wrench and pop that big nut off. If the spring sticks out very little and the valve moves, that's not your issue.

 

[RmvBfrFlght]

Happened on the 'missus 3.8l N/A Regal. A piece of the upper timing chain wedged into the relief valve and held it open. Made a lot of valve train rattling sounds and had no power.

Plastic upper timing gear was coming apart...

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