Hi guys, took the boat out yesterday for a long run in the sun and after 20 minutes the oil pressure started creeping below 40psi, then within another minute or so was at 20psi, then all of a sudden dropped to zero! I was running a steady 3500rpm.
I let the engine cool for a while then limped back to the marina at 900rpm with about 5psi showing.
The engine is fairly standard and has a new slightly upgraded oil pump fitted and has had lovely pressure for the last 4+hours use I have had out of it this season.
The engine is going to have to come out I am sure, but what are your thoughts on what it might be? Am hoping not a cracked block, is that likely?