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Old 12-04-2018, 16:25   #16
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Re: volvo md11 water in the oil

When you put a new head gasket on, try using VHT Copper Gasket spray. I had to run 2 gaskets on an engine to lower the compression. This is a top class product that solved my problem. I certainly helps.
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Old 12-04-2018, 16:54   #17
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Re: volvo md11 water in the oil

35 year old motor - pull it out of the boat and take it to engine rebuilder for professional remanufacture otherwise you will be chasing problems for the rest of your life. Could be this could be that, could be cracked block..........you will waste too many hours attempting those fixes.

Better yet, toss it out and put a brand new Yanmar in it!
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Old 13-04-2018, 01:45   #18
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Re: volvo md11 water in the oil

Ditto as above .

Quite strange, sometime it is better to show practicality, not prowess :-)
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Old 13-04-2018, 07:11   #19
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Re: volvo md11 water in the oil

right Martin another post mentioned the same about the head gasket source. I also found leakage from one exhaust gasket but not sure how much would enter the crankcase if any. Today we put it back together and see what we get. tbc
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Old 13-04-2018, 11:29   #20
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Re: volvo md11 water in the oil

No water in the block...but thanks for the yanmar suggestion ��very helpful
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Old 16-04-2018, 17:53   #21
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Re: volvo md11 water in the oil

Update on water intrusion. Replaced o rings in the block only. Did seals in impeller housing . Replaced after market head gasket with originals. And cleaned up exhaust manifold for better gasket seal. Ran engine at fast idle for an hour and no water in oil yet. Sea trial tomorrow with crossed fingers.
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Old 17-04-2018, 09:38   #22
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Re: volvo md11 water in the oil

Congratulations! I love these old engines, hope you can keep this going for another 50 years.

After-market head gaskets may not be the best option.....
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Old 18-04-2018, 13:30   #23
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Re: volvo md11 water in the oil

Ok here it is ...2 hour shakedown water test went well no water in the oil . However might have an overheat issue . Temp gauge went on the blink and died might be sending unit , anyway pulled out the infra red temp gun and saw 225 to 235 f degree on the cylinder head and 200 on the cylinder itself . Not sure if that's normal or overheat ...exhaust manifold was 190 .???? Raw water cooled only and seems like not enough water out the pipe
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Old 18-04-2018, 17:29   #24
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Re: volvo md11 water in the oil

Quote:
Originally Posted by goboats View Post
Ok here it is ...2 hour shakedown water test went well no water in the oil . However might have an overheat issue . Temp gauge went on the blink and died might be sending unit , anyway pulled out the infra red temp gun and saw 225 to 235 f degree on the cylinder head and 200 on the cylinder itself . Not sure if that's normal or overheat ...exhaust manifold was 190 .???? Raw water cooled only and seems like not enough water out the pipe
Way too hot IMO, raw water cooled engines usually operate around 120 F. This is the maximum temperature that keeps the salt from building up in the water jacket.

I can't speak directly for the MDII but a quick check of the specs for the thermostat and/or temperature alarm switch should confirm the max operating temperature.
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