You did not say what the pressure is at idle.

Does the guage read when idling? Some manufacturers allow a very low
pressure when hot idling. I will check my engine manual next time I go to
the boat.

50 psi when running seems quite OK.

Alec


"hookipa" wrote in message
ups.com...
I recently moved my boat from New Zealand (cold water) to Tonga (very
warm water) and I am now experiencing very low oil pressure at
operating temperature at idle. The engine is a Volvo Penta AD31B and
I am not sure of the hours on the engine. As the engine has seperate
circuits for the oil warning light and the gauge, I believe that the
problem is not the gauge/sender. At operating speed i get about 50
psi, but at idle it sometimes turns on the warning light. Any
thoughts or checks before I pull the boat and remove the engine to
check the main bearings and oil pump?