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Henry Schmidt Henry Schmidt is offline
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Join Date: Apr 2004
Location: Fallbrook, Ca. 92028
Posts: 5,942
Re: Early oil pump with late pressure relief pistons

Originally posted by nein14-6
I just pulled a motor apart that had low oil pressure and had this combination. Would this contribute to a low pressure problem.
No, oil pressure will not be effected by early oil bump and late pressure relief valves.
Also, I have found quite a bit of metal shavings in the oil screen but all the bearings are still intact. Can I take the oil pump apart to check the internals?

The oil pump can and should be dissassembled for inspection. It is possible that the shavings you found are a result of poor cleaning prior to the last assembly. If this is a mag case, low oil pressure at idle is generally the main bearing bore / main bearing clush is out of tolerance.
I did see one engine case that had a small piece missing from the case at an oil passage from a previous explosion.
Very rare, but find the problem before you assemble the engine.

Henry Schmidt
Ph: 760-728-3062
Old 07-25-2004, 09:34 AM
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