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Old 15-05-2007, 11:29   #1
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Hard Starting Yanmar 3GM30

I have a Yanmar 3GM30 diesel engineon my 34' Hunter that does not want to start after setting for 6 or 7 days. This started occurring after I had a mechanic replace a timing gear cover which required disconnecting the govenor. Prior to this work the engine would start with very little starter input. Now, I have to run the starter for 15 seconds, let the starter cool for about 1 minute, and repeat several times before the engine starts. It tries to start during this process but just can't quite catch. When it does finally start there is a cloud of black exhaust. If I restart the engine within 2 or 3 days, it starts immediately. I'm thinking there is a small leak somewhere in the fuel line that is allowing fuel to drain from the delivery lines back into the fuel tank, but this is just a guess. Has anyone else had this type of problem with a Yanmar, or other type of diesel engine, or have any ideas on where the problem may be?
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Old 15-05-2007, 12:53   #2
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If the engine has started fine upto the point of someone working on it, chances are he has done something. I could imagine he has upset the timing. First course of action is get the guy back and say, you broke it, you fix it.

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Old 15-05-2007, 13:47   #3
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Because the injector pump needs to be removed to remove the timing cover. I'd be willing to be there is and air leak at the injector pump.
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