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Old 21-02-2014, 20:24   #1
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Yanmar 2GM Exhaust and cooling water mixing chamber

My 2GM is squeezed in where an atomic 4 used to be on a C&C 27. Many of my fellow sailor friends have advised me to take a look at the mixing elbow where the raw cooling water and exhaust mix to see if a deposit is accumulating in the area. This puts a considerable back pressure on the exhaust system which reduces the engine power. My question is there an easy method to do this or do I have to remove the elbow in a very cramped area. I have no idea what the inside of the elbow looks like.
Carl
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Old 21-02-2014, 20:45   #2
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

You may be able to remove the flex hose and using a mirror and light (or phone camera) and have a look up there without actually removing the elbow. Much will depend on just how much room there is to get at it.
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Old 22-02-2014, 02:04   #3
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

Is it the salt-water cooled model (2GM or 2GM20),

or the fresh (with heat exchanger - model 2GMF or 2GM20F) ?
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Old 23-02-2014, 15:17   #4
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

It is raw water cooled and is a vary old 13 HP
CARL
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Old 04-03-2014, 05:41   #5
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

Sorry, Pw

This fell under my radar. You've probably long since done it, but FWIW I agree with glenn
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Old 04-03-2014, 06:01   #6
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

Or one of the $15 USB endoscopes....
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Old 04-03-2014, 07:50   #7
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Re: Yanmar 2GM Exhaust and cooling water mixing chamber

If your engine doesn't blow much black smoke at wot then your exhaust elbow probably isn't plugged. When you first kick the throttle up it will smoke a lot, but after the boat speed rises the rpm will stabilize and the black smoke will mostly stop- maybe just a light grey.

If you still have heavy black smoke, then the injection elbow MAY be the culprit.

David
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