Mark Powers
New member
Hello fellow boat owners and all around marine oriented folks.
I have (several) yanmar 6LP STZE 315HP diesel engines in 32' charter boats here in Alaska. We have one that is bleeding engine lube oil into the coolant (fresh water side...boat has raw salt water to fresh water heat exchanger). We have torn into the internal lube oil cooler located unter oil filter and pressure tested that assembly AND inspected the head gasket. Neither appear to be failed. We are getting A LOT oil engione oil into the coolant...need other ideas...??? Failed block? Has anyone seen this before? Two Yanmar dealers that we use are scratching thier heads.
I have (several) yanmar 6LP STZE 315HP diesel engines in 32' charter boats here in Alaska. We have one that is bleeding engine lube oil into the coolant (fresh water side...boat has raw salt water to fresh water heat exchanger). We have torn into the internal lube oil cooler located unter oil filter and pressure tested that assembly AND inspected the head gasket. Neither appear to be failed. We are getting A LOT oil engione oil into the coolant...need other ideas...??? Failed block? Has anyone seen this before? Two Yanmar dealers that we use are scratching thier heads.