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post #11 of 80 Old 01-09-2014
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Re: Yanmar 1GM10 runaway?

Thinking further...perhaps you had something fouling your prop that you lost in bits or unwound in an erratic way...kelp or other heavy bio material loading her up and keeping revs down that disintegrated to allow the engine to rev higher until the governor "caught" the engine speed and brought it back down. That clunk could have been the prop/shaft/tranny loading up with the heavy load of the foulant?
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post #12 of 80 Old 01-09-2014
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Re: Yanmar 1GM10 runaway?

You mentioned the dipstick, ? If it is not sucking lube oil from somewhere, which I think might be constant,? It may be in the linkage system. You might try disconnecting all the linkage components at the engine and try to duplicate the run away/over reving.

I think if it was sucking lube oil it would rev higher than 4,000 RPM or until it scatters? The other possibility could be a bad injector pump which could be checked by a shop.

Let us know what you find, always interesting.

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post #13 of 80 Old 01-09-2014
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Re: Yanmar 1GM10 runaway?

My guess is some how the prop is slipping and re-engaging.
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post #14 of 80 Old 01-09-2014
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Re: Yanmar 1GM10 runaway?

My thought is a sticking valve in the injection pump as well they need some type of lubrication added to the fuel now days with the ultra low sulphur fuel now days replaced the db 2 pump on my old 7.3 International and the company said I had to use a fuel adative lube or it would void the warranty. ( Thanks epa) and that uncontrolled fueling would explain all the symptoms including eventually correcting its self.

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post #15 of 80 Old 01-09-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

Well, it may turn out to be one of those weird things that never gets explained, resolved (and hopefully) never happens again. I'll check what I can at the weekend and then just see what happens. If it does it again then obviously I'll have to start pulling things apart, which likely means pulling the whole engine out.

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post #16 of 80 Old 01-09-2014
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Re: Yanmar 1GM10 runaway?

Most likely, and most commonly with that engine, the fuel rack became stuck. It doesn't need to be at full load to overwhelm the governor and the runaway speed will naturally be limited by the pumps lack of advance timing and valve response. Nothing else makes sense.
Check your filters for debris, treat your fuel (lubricity) and have your pump and injector removed and inspected.
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post #17 of 80 Old 01-10-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

I'll have a fiddle at the weekend. Then I'll go look at the engine. The fuel rack is the gubbins inside right? I need to take the filler cap off and poke about until I find the lever and make sure it all seems to operate smoothly? I'll pick up some diesel treatment goop as well, cleaner and lubricant. At some point I guess I'll have to take the top off the engine and check the moving parts under there, get the elbow off and check that too. And then I might as well pull the whole head off, and get the injector off for a service, and the pump at the same time.
I see oily hands and much swearing in my future, I refuse to pay a shop $100+ an hour.

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post #18 of 80 Old 01-10-2014
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Re: Yanmar 1GM10 runaway?

PIV, other than the contortions required to get to everything in the engine bay, the 1GM10 is lawnmower-simple to work on. removing the elbow, the injector, the bonnet, the alternator, etc., requires one, maybe two wrenches, a 12mm and 14mm if i remember correctly.

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post #19 of 80 Old 01-12-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

Well, oil level was a touch above max so I syphoned off about 1/2-3/4 pint of oil, that put it a touch below max. Cleaned out the air filter, was a bit oily but nothing crazy, checked all the throttle levers etc, adjusted the alternator belt tension. Couldn't see anything obvious, dumped a bottle of fuel treatment/lubricating stuff in the tank as well, can't do any harm.
See what happens I guess.

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post #20 of 80 Old 01-12-2014
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Re: Yanmar 1GM10 runaway?

The manual say's your engine only holds 1.3 litres of oil. Removing 30-50% of the oil will probably solve the problem.
If the oil doesn't have a diesel smell to it then you might want to fix the lock on the companionway door. You don't want anymore people breaking in in the middle of the night and over filling your crankcase again.
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