It all started last year when i bought a monterey 254-fsx model year 2008 with inboard volvo penta 8.1l. I had a problem with a failed valve spring and had to remove the engine and rebuild it ( manifolds, risers, lifters, rockers, gaskets, seals, oil pump, water pump, pistons, piston rings, valve stem seals and eveything else tou can imagine....
The boat runs smooth, can reach factory numbers of 4000 rpm.
BUT..... losing 1qt of oil per hour of use... no smoke on cold start and no smoke while running and runs from the first ignition.
Only fresh un burnt oil sheen visible when turning off the boat coming out from the stern drive exhaust on the top of the water.
No oil leaks inside the engine bay, no water in engine oil.
This is driving me crazy... i tested the oil cooler... removed it and pressure tested it without any sign of leaks.
We reached a point of faulty cylinder gasket or crack in engine block. But how can thia be true when no visible water in the oil.
HeLP
The boat runs smooth, can reach factory numbers of 4000 rpm.
BUT..... losing 1qt of oil per hour of use... no smoke on cold start and no smoke while running and runs from the first ignition.
Only fresh un burnt oil sheen visible when turning off the boat coming out from the stern drive exhaust on the top of the water.
No oil leaks inside the engine bay, no water in engine oil.
This is driving me crazy... i tested the oil cooler... removed it and pressure tested it without any sign of leaks.
We reached a point of faulty cylinder gasket or crack in engine block. But how can thia be true when no visible water in the oil.
HeLP