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Old 16-03-2010, 07:51   #1
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Repower - Replace MD11C with 3GM30

Planning to replace a volvo MD11C with a yanmar 3GM30F.

Have not been able to find information on required exhaust size.
The boat has a water jacketed stainless exhaust system that is in good condition - with a 2 inch exhaust pipe.

I'll need to modify the system (change the flange connections for the flex pipe and fabricate a flanged pipe to fit the yanmar manifold) but the primary concern is the size of the pipe. Is 2 inches adequate for the 3GM30 engine?

If this can work, I'm still in the market - looking for a 3GM30F if anyone knows of an available engine.
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Old 16-03-2010, 11:37   #2
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Location: Yemen & Lebanon... the sailboat is in Lebenon, the dhow is in Yemen
Boat: 1978 CT48 & 65ft Cargo Dhow
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Hey sail.boat ...welcome to the forum and good luck with the repower!
S/V Arctic Lady
I love my boat, I can't afford not to!
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Old 17-03-2010, 11:15   #3
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Location: Maitland, FL
Boat: Bristol 29
Posts: 230
I have a 3GM30F in my boat and the exhaust hose is 2" ID.
"The lookout that first sights the cat shall have ten guineas and remission of sins, short of mutiny, sodomy, or damaging the paintwork." - Jack Aubrey
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3gm, 3gm30, repower, yanmar

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