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| Volvo Penta 431B Water In Oil. |
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Robert Mann
New member
Username: tekati
Post Number: 2
Registered: 07-2009
| | Posted on Monday, July 06, 2009 - 02:39 pm: | 
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Looking for likely suspects.
Boat in ocean. Went on a 4 mile cruise, parked boat in slip and left for 4 days. Came back to find motor turning over very slowly like it was on its way to being locked up, when checking the oil dipstick it was halfway up the dipstick with water. Pulled the plugs and water poured out of a few of the cylinders ON BOTH SIDES!. Interestingly the oil was not white as my guess the oil was not churned with the water yet.
So what would be the likely suspect? Both exhaust manifolds bad at the same time leaking water in? Both head gaskets blown leaking water in? Another issue I am not thinking about?
Another point this is a twin engine boat with 1 new rebuilt engine by a reputable company. Also this is not a closed loop system so the salt water is cooling the entire process no fresh water cooling. This new rebuilt is the one with the issue. The boat has been on several runs since the new engine was installed. That motor had at least 40 miles on it before this mishap.
If you have multiple things that could have caused this any way to test for to figure out the issue without a complete tear down of the motor? |
El Pescador
Senior Member
Username: el_pescador
Post Number: 4612
Registered: 02-2006
| | Posted on Monday, July 06, 2009 - 02:55 pm: |
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Make sure you coat the gasket that goes between the risers and the exhaust manifolds with a good sealing compound. Use something like Loctite Gasket Compound, Permatex #2, or Quicksilver Perfect Seal.
Also, check with the reputable company that rebuilt your engine that they have used marine head gaskets, for automotive gaskets will corrode and leak in no time when in contact with salt water.
You can also try a compression test and a leak down test to see if you have head gasket problems. |
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