Volvo MD6A Milky Oil - Need Some Advice - SailNet Community
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post #1 of 10 Old 04-19-2016 Thread Starter
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Volvo MD6A Milky Oil - Need Some Advice

Hi,

My wife and I just purchased a Columbia 8.7 sloop a week ago. My buddy had the boat for years but after an accident in the fall, was unable to winterize the Volvo MD6A. The result was "milky oil" in the pan. The boat has not had it's engine ran since that time and rather than giving up, I wanted to learn what might be the cause and see if it can be fixed before I hang an outboard on her for a year.

I've seen some information on the water pump gaskets causing water to get into the oil and wonder if anyone has had the problem with an MD6A or MD7A that was not winterized and what exactly failed.

Any suggestions on how to proceed?

Thanks!
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post #2 of 10 Old 04-19-2016
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Re: Volvo MD6A Milky Oil - Need Some Advice

milky oil is always water in it. The challenge is to determine where it is coming from, and how it gets to the oil pan/engine internals.

You do not say where the boat was overwintered, but if it was not winterized and was subject to hard freezing...you may have your answer.

I would borrow or buy a pressure tester to see if that system leaks down, to start with. IF no leak, a good visual of the entire engine looking for oil and water leaks. If the pan can be dropped, you may want to drain the oil and clean any water from the system, make sure the oil level is accurately determined.

Best of luck,
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post #3 of 10 Old 04-19-2016
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Re: Volvo MD6A Milky Oil - Need Some Advice

Where was the boat. I don't think here in New York we had weather cold enough to really do much damage to an engine this winter. But it does sound like water in the oil. Could be condensation (OK that is the optimist in me) but likely water from somewhere. If it backed up into the exhaust system, into exhaust valves down into the oil it might be ok, but likely at least rusty valves. Also depends on if it is raw water cooled or fresh. Compression test is going to be the starting spot. Does it crank?

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Re: Volvo MD6A Milky Oil - Need Some Advice

Thanks for the suggestion. I am going to get a mechanic and suggest that to start. The boat was in the water but I believe that it was subjected to a hard freeze.
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Re: Volvo MD6A Milky Oil - Need Some Advice

We were in Maryland. The boat was raw water cooled. I wish it had a heat exchanger. My problems would be less. The info that I got here will help me with my discussion with a mechanic.

Thanks!
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Re: Volvo MD6A Milky Oil - Need Some Advice

Any luck with your quest? I'm having a similar milky oil issue with my Volvo MD6A and suspect a faulty water pump gasket...

Cheers
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Re: Volvo MD6A Milky Oil - Need Some Advice

Quote:
Originally Posted by eightpoint7 View Post
Hi,

My wife and I just purchased a Columbia 8.7 sloop a week ago. My buddy had the boat for years but after an accident in the fall, was unable to winterize the Volvo MD6A. The result was "milky oil" in the pan. The boat has not had it's engine ran since that time and rather than giving up, I wanted to learn what might be the cause and see if it can be fixed before I hang an outboard on her for a year.

I've seen some information on the water pump gaskets causing water to get into the oil and wonder if anyone has had the problem with an MD6A or MD7A that was not winterized and what exactly failed.

Any suggestions on how to proceed?

Thanks!
Hi, the fact that the oil is milky indicates that it has water in it, and if you have not run it since you acquired it the problem predates your ownership. if there is a problem that allows water into the oil without the engine being run then the oil will float on the top of the water in distinct layers but if the oil is milky then the water entered whilst the engine was running. If that is the case then a discussion needs to be had with your buddy.
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Cheers, Uncle Bob the 1st from Sydney Aust.
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Re: Volvo MD6A Milky Oil - Need Some Advice

3+ yrs, since the OP. They must have figured it out by now.

Agree that it sounds like the engine was likely running with water in it. I doubt that MD temps, especially with a boat stored in the water, are harsh enough to hard freeze and crack a block.


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Re: Volvo MD6A Milky Oil - Need Some Advice

Guess I'm to blame for resurrecting this thread, had hoped that the source of eightpoint7's oil infiltration was eventually determined so that i might test his solution on my MD6A. Wondering if faulty water pump gaskets could indeed be responsible for milky oil in my Volvo diesel as this would be the easiest fix...
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Re: Volvo MD6A Milky Oil - Need Some Advice

My 1st thought on water in oil is head gasket.
I do not know that engine
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