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post #31 of 80 Old 01-14-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

Given the choice between stopping an engine or having the engine disintegrate in spectacular fashion and holing the hull, umm, I'll risk a valve.
The lever is listed as one of the emergency stop methods for the engine. It's reachable easily from above with little risk of having hand/arm caught in moving parts. I think the air intake involves crawling down inside a lazarette and getting up close and personal with the engine. Not something I fancy doing while it's screaming away.
Anyway, hopefully this is all just a theoretical discussion but I guess I'll find out one way or the other

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post #32 of 80 Old 01-15-2014
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Re: Yanmar 1GM10 runaway?

It's not unusual in 'hard starting' situations to crank an engine with the decompression lever on until you get some speed up, the releasing it - often the engine will start then, when it might not turning slowly against the compression.

If that's the case, then there must be valve clearance provided. In fact I suspect that any engine with a decompression lever is a clearance engine. Ours is not, and does not offer decompression.

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post #33 of 80 Old 01-15-2014
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Re: Yanmar 1GM10 runaway?

I wouldn't use the decompression lever on a diesel that is at maximum rpm or over. Clearance engine or not. Yes it is an emergency method for stopping an engine, emphasis on emergency. In an emergency the valves are expendable. Stuffing a rag into the intake is a safe way to stop the engine if it is possible. On my engine, were this to ever occur, the air intake is easily accessible.

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post #34 of 80 Old 01-15-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

I've read that putting a flat plate over the intake is better than stuffing a rag into it, less chance of things getting into the engine. Probably the best I'd have thought is to get a through-hull plug and leave it within reach of the intake, whack that bad boy in and all goes quiet. As long as you can reach it of course.

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Re: Yanmar 1GM10 runaway?

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I've read that putting a flat plate over the intake is better than stuffing a rag into it, less chance of things getting into the engine. Probably the best I'd have thought is to get a through-hull plug and leave it within reach of the intake, whack that bad boy in and all goes quiet. As long as you can reach it of course.
A large rag, a tennis ball of it is a round intake, a flat piece of wood, whatever works.

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Re: Yanmar 1GM10 runaway?

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A large rag, a tennis ball of it is a round intake, a flat piece of wood, whatever works.
Whatever you do don't use your hand....

Ron

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post #37 of 80 Old 01-21-2014
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Re: Yanmar 1GM10 runaway?

Ditto that-there is a tremendous amount of suction,even in the single cylinder Yanmars-way more in the 2QM-dont ask how I know this-Chris-Tern-NZ
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post #38 of 80 Old 03-09-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

OK, so coming out of the harbour this morning, throttled up, fine, throttle back, fine, throttled up again (I was seeing if it would rev higher after having the prop cleaned).

Loud metallic banging, sounded like it was come from under the cockpit floor, throttled back and up went the revs again. Before I could get into the locker to cover the intake, the revs came back down and she shut off. As I was now drifting about 100ft from shore, with zero wind and current taking me back in, had no good options but to fire her up again, she started just fine and was fine for the rest of the trip.

I am 100% sure this is not a runaway, it's almost like something is taking it slightly out of gear (the knocking), and at the same time, putting full throttle on. The obvious candidate is the Edson single lever control, I think it is getting caught up inside somehow and managing to apply both the throttle and shift at the same time.

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post #39 of 80 Old 03-09-2014
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Re: Yanmar 1GM10 runaway?

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Originally Posted by PaulinVictoria View Post
OK, so coming out of the harbour this morning, throttled up, fine, throttle back, fine, throttled up again (I was seeing if it would rev higher after having the prop cleaned).

Loud metallic banging, sounded like it was come from under the cockpit floor, throttled back and up went the revs again. Before I could get into the locker to cover the intake, the revs came back down and she shut off. As I was now drifting about 100ft from shore, with zero wind and current taking me back in, had no good options but to fire her up again, she started just fine and was fine for the rest of the trip.

I am 100% sure this is not a runaway, it's almost like something is taking it slightly out of gear (the knocking), and at the same time, putting full throttle on. The obvious candidate is the Edson single lever control, I think it is getting caught up inside somehow and managing to apply both the throttle and shift at the same time.
Aha, I think you have found it. If possible, with a helper, disconnect one or both of the control cables, from the transmission and the injector pump & operate them manually as a test. If it didn't rev past the normal maximum RPM when out of gear it probably isn't an actual "run away"?

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post #40 of 80 Old 05-15-2014 Thread Starter
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Re: Yanmar 1GM10 runaway?

Bit of an update, pulled the head off the engine today as the problem is getting worse and worse. Looks like there is diesel getting into the oil after all. The piston, combustion chamber etc all looks OK.
I am going to take the high-pressure fuel pump and injector in to get looked at, any other likely sources of diesel getting into the oil?

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