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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


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Old 11-06-2010
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volvo md7a question

Curious if someone can tell me about this motor.. I am looking at a US yachts 30 equipped with it, and it is the original motor; the boat is around 30 years old.

She has lived in salt water her whole life as far as I know, and I was told by the owner there are no anodes; he also mentioned that the water lines are thicker to help withstand corrosion.

I am mechanically inclined but not familiar with the motor.. if anyone could give me some info or a heads up on what to look for problem-wise when I go see it that would be appreciated..

Thank you
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Old 11-06-2010
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I would warm the engine up and use a non-contact temperature probe to look for hot spots. Likely problem areas are front of the head. The water passages can rust shut there and need serious cleaning. I would find the water level and look for problems there as that is where the rust line is. Water drains back through the water pump until the level in the engine and ocean are equalized. Not a problem if the water inlet valve is turned off when the engine is shut off.

Search for previous posts on this engine to describe some of the issues. Not a bad engine but parts are outrageously expensive and difficult to get. If it works well it should last many more years but I would check it out closely.

Water pumps are problematic and can leak water into the oil. Not a problem if maintained properly or if the newer designed pump is installed.

Be sure you can do a cold start. Engine off for at least a day. If it starts easily that is a good sign. Otherwise compression should be checked.

Shouldn't smoke, much anyway. It's an old engine so you would expect some wear.

Gene
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