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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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Hey sail.boat ...welcome to the forum and good luck with the repower!
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Old 17-03-2010, 11:15   #3
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I have a 3GM30F in my boat and the exhaust hose is 2" ID.
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