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AD41B fluctuating oil pressure

K

kiwi boatie

New member
Hi. I have an AD41B which has oil pressure sitting at 30 PSI at idle and increases to around 55 PSI with engine revs. It is currently out of the boat for a re-fit. What is the most likely cause of this? The starboard side engine has perfect oil pressure at 60 PSI.

Engine has new filter - new oil.

Any help greatly appreciated.
 
Hi, Thanks for responding. Will swap sender with port side engine to see if that is the issue. Also have located a standard pressure gauge to fit which should confirm if this is the problem. There are two pressure relief valves in the oil cooler housing is this what you refer to or is there another one in the oil pump buried in the sump?
 
There is only one relief valve, and its in the sump, attached to the oil pump body.

All my engines idle warm at 30psi, and increase to 50-60psi at cruise. Cold engine will show 50-60psi at startup and until warm. Both engines have same grade oil, and are changed about the same time?
 
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