Oil pressure

Hello Gary

Seems nobody wants to tackle this one.  From what I know the oil pumps on the type 915 (912iS also) have a completely different pressure relief system from the older 912 and 914 engines.  They can get very small bits stuck on the top of the regulator piston that might lead to some erratic oil pressures (leading to lower pressures) 

remove your safety wire and take off the pressure regulator.  The piston has a flat top, the seat inside the housing is also flat and check to be sure that there is no contamination between the 2 parts.  This is just a check and if you do find something you need to know what it might be to determine where it came from. 

Cheers

Thank you, I got away for a while. The problem was a hair line crack in the very highest point of the oil suction side (metal tube) just before the oil pump so it never leaked any oil, and wasn’t a suspected part. I found it by pressurizing the oil system and spinning the propeller by hand… the the crack leaked oil.

thank you sincerely Gary