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Old 10-21-2012
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Re: no start Yanmar

I don't know whether you have solved your problem or not because I never read all the posts but I'll offer this in case the problem persists.

I have a two cylinder Kubota in my genset and I left it unstarted for about a year. when I came to start it it coughed once or twice then each time I tried starting it, it started running for a few seconds before dying.

After a long search of the fuel system, I randomly pulled the rocker cover off and discovered that one of the valves had stuck down and the pushrod had jumped out of the socket in the rocker. So I had just one cylinder with compression and that was enough to fire but not to keep the engine running.

Refitted the pushrod, eased up the valve with WD40, started her up and she runs sweetly again

There were no strange noises or anything to indicate a mechanical issue so the naysayers who are going to say it would make a noise are wrong. Once the push rod jumps out, the valve simply doesn't work anymore.

I don't know if Yanmar is the same as Kubota, on the Kubota the valve doesn't appear to go deep enough to touch the piston so no long term damage resulted from the valve sticking down

Try it. it only takes a few minutes to lift off the rocker cover.
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