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Old 08-09-2019, 01:04 PM   #1
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back pressure yanmar 2gm20f

My Yanmar stop running yesterday coincident with fumes and water in the engine room
The engine slowed over about a minute and then stopped and wouldn’t restart
Today it started but there are year is a leak at the exhaust elbow meeting pipe with water and exhaust fumes
Why would that cause the engine to stop?
Obviously I need to replace it but..
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Old 08-09-2019, 04:08 PM   #2
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The Yanmar GM series has a well known problem of blocking the exhaust elbow with scale build up. That and corrosion could have caused your engine to stop and exhaust/water to leak out.


Unbolt/unscrew the elbow assembly from the end of the exhaust manifold and look inside for scale build up. Replace if plugged and/or corroded.


David
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Old 08-09-2019, 07:57 PM   #3
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Go to cruiserforum and do a search, there's every conceivable problem with GM's answered there.
All those guys there are yachties and that size motor was standard issue.
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