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post #1 of 5 Old 01-17-2013 Thread Starter
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yanmar 2GM20F

Hi folks
This morning I encountered a problem with my yanmar. After filling with oil, coolant, cleaning raw water filter and a test run last night she broke down on me just before I was to leave this morning. Symptoms:
Massive quantities of white smoke (smells like steam?)
Black soot-like slick mixed with raw water coming from exhaust (unburned fuel?)
Unprovoked revving to high RPM and (here's the odd part) the complete inability to shut down. When choke is pulled the engine just keeps running away until it apparently can't take it anymore. I fear doing more damage if I attempt to run the engine again. Mechanic coming at 8 AM tomorrow morning and mentioned worst casescenario being a rebuild. Wanted to get the thoughts of the sailing community first.
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post #2 of 5 Old 01-17-2013
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Re: yanmar 2GM20F

White smoke is usually a sign of 'burning' glycol coolant. Assume it's FWC? But a massive coolant leak wouldn't cause a runaway condition, I wouldn't think.

Whatever it is, it sounds expensive.....

Ron

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".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
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post #3 of 5 Old 01-17-2013
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Re: yanmar 2GM20F

Maybe too much oil in the crankcase, causing it to run on it's own lube oil. Or as a considence. Sounds like it may be related to the work you just compleated.

Paul T
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post #4 of 5 Old 01-18-2013
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Re: yanmar 2GM20F

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Originally Posted by dabnis View Post
Maybe too much oil in the crankcase, causing it to run on it's own lube oil. Or as a considence. Sounds like it may be related to the work you just compleated.

Paul T
I'm certainly no diesel mechanic, but I was thinking the same thing Paul. Problems that appear right after servicing always make me think back over the servicing first. I'd check the oil. Did you suck out and put back in about 2 quarts?

Tom K

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post #5 of 5 Old 01-30-2013 Thread Starter
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yanmar 2GM20F

Guys thanks very much for the responses. Turns out there was too much oil and it just ran away. All good though. Still heading south. Thanks again to all
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