All even # cylinders (2,4,6,8) had water along with lots of water in oil on port engine
It's 2006 MerCruiser 5.0 MPI serial # OW614502 with 425 hrs -- the boat is Chaparral 290 Signature with Twin 5.0
Engines are raw water cooled (sea water). Oil changed at the end of every season. We are located in Panama City Florida. Boat is stored indoors climate controlled. no issues with freezing temps.
In 2018 lost power on port engine with 300 Hrs, turns out the culprit was bravotis which caused low water flow and hotspots which damaged a couple valves
Had the heads rebuilt, new gaskets, bolt, etc. Manifolds were replaced at 270 hrs a few months prior to the rebuild.
Has run great for the past 6 years. ALWAYS rinsed after EVERY use. No issues starting up.
Today we went to the Gulf Coast Air Show - 15 miles each way. Had a bit of a restart issue for the trip back, took a couple tries to get it to start.
Ran flawlessly all the way back. Also, I installed a SmartCraft system and a Simrad Screen in 2019 so I can monitor the data on each engine. Temperature was the usual 156 degrees with 45-60 oil pressure depending on RPM. and also, the usual 10-11 PSI on the coolant
Then we pull into the marina and cruise in at minimal speed and low RPM. As we tied to the dock, the port engine stopped and would not start. I tried twice, all I heard was a clunk like a hammer hitting the oil pan.
As soon as we go her home, started pulling the plugs. Water immediately started coming out as I pulled the plugs on 2,4,6 & 8
When I started suction of the oil the first few seconds it was just clear water followed by milkshake oil. The engine has the oil drain hose that is connected to the oil pan drain, I just connect the oil extractor (vacuum) cannister to the drain hose to drain the oil.
I drained the cooling system. Did not have any fogging oil. so used Seafoam Spray into the spark plug holes, added oil to the engine and manually turned the engine until I was suctioning clear clean oil. Basically, just trying to stop the "Bleeding".
I have not had time to disassemble anything. So here are my questions.
Thank you very much for any help.
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It's 2006 MerCruiser 5.0 MPI serial # OW614502 with 425 hrs -- the boat is Chaparral 290 Signature with Twin 5.0
Engines are raw water cooled (sea water). Oil changed at the end of every season. We are located in Panama City Florida. Boat is stored indoors climate controlled. no issues with freezing temps.
In 2018 lost power on port engine with 300 Hrs, turns out the culprit was bravotis which caused low water flow and hotspots which damaged a couple valves
Had the heads rebuilt, new gaskets, bolt, etc. Manifolds were replaced at 270 hrs a few months prior to the rebuild.
Has run great for the past 6 years. ALWAYS rinsed after EVERY use. No issues starting up.
Today we went to the Gulf Coast Air Show - 15 miles each way. Had a bit of a restart issue for the trip back, took a couple tries to get it to start.
Ran flawlessly all the way back. Also, I installed a SmartCraft system and a Simrad Screen in 2019 so I can monitor the data on each engine. Temperature was the usual 156 degrees with 45-60 oil pressure depending on RPM. and also, the usual 10-11 PSI on the coolant
Then we pull into the marina and cruise in at minimal speed and low RPM. As we tied to the dock, the port engine stopped and would not start. I tried twice, all I heard was a clunk like a hammer hitting the oil pan.
As soon as we go her home, started pulling the plugs. Water immediately started coming out as I pulled the plugs on 2,4,6 & 8
When I started suction of the oil the first few seconds it was just clear water followed by milkshake oil. The engine has the oil drain hose that is connected to the oil pan drain, I just connect the oil extractor (vacuum) cannister to the drain hose to drain the oil.
I drained the cooling system. Did not have any fogging oil. so used Seafoam Spray into the spark plug holes, added oil to the engine and manually turned the engine until I was suctioning clear clean oil. Basically, just trying to stop the "Bleeding".
I have not had time to disassemble anything. So here are my questions.
- With water in both the cylinders and engine oil, is this a blown gasket or a failed manifold/risers?
- What else can I do to this engine until I have time to take it apart, besides the things I already performed (Hopefully didn't make it worst)?
Thank you very much for any help.
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