Yanmar 1GM10 won't start. - Page 2 - SailNet Community
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post #11 of 16 Old 07-22-2013
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Re: Yanmar 1GM10 won't start.

if fuel is good, intake and exhaust elbow are clear, then I am with arvicola- your fuel shut off cable is hanging up.
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post #12 of 16 Old 07-22-2013 Thread Starter
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Re: Yanmar 1GM10 won't start.

Fuel shut-off is stuck in shut-off position or the cable has come adrift from the arm on the FCU Valves stuck open - maybe due to slight mis-rig of the decompression lever - a 'love tap' with a rubber hammer on the rocker cover could be the fix for this, otherwise pull the rocker cover and see if the valves are moving through full range as you crank it.

Now that sounds like a solid concept. I'll try to get out to the boat and give it a try.

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post #13 of 16 Old 07-23-2013
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Re: Yanmar 1GM10 won't start.

Any idea the cost to rebuild a single cylinder Yanmar like this? Sorry, this doesn't answer your question but I am considering buying a Hunter 30 with one of these engines and I suspect a rebuild may be in order. TIA. Hank
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post #14 of 16 Old 07-27-2013
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Re: Yanmar 1GM10 won't start.

Quite simply, if timing compression and fuel are all ok it has to fire, physics says that. Working injectors and injector pump with ample fuel and compression makes a bang. If it hits on starting fluid sprayed in the intake, you are most likely not getting fuel in the cylinder. Possibly low compression, but a low possibility. Drain fuel system on the engine, purge the fuel lines to the engine, check and change filters, replace fuel with new clear diesel charge system and bleed completely. Unless you have a timing or compression problem it should at least hit.
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post #15 of 16 Old 08-08-2013 Thread Starter
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Re: Yanmar 1GM10 won't start.

GRIM news. It's compression. Shite.

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post #16 of 16 Old 08-08-2013
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Re: Yanmar 1GM10 won't start.

Maybe the valves? Try a valve adjustment before you remove the head. It's possible that one of the valves is fouled up with carbon deposits or even burned and can't seat. Pulling the head will tell you if it's valves or rings. In any case, re-ringing one of these shouldn't cost a lot, maybe $200 for rings and gaskets if you do the work yourself. For a one banger, maybe just order a new piston with rings and replace the bearings while you're at it. You'd essentially have a new engine.

Looks like it ran on ether just because ether doesn't need compression to ignite.

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Last edited by smurphny; 08-08-2013 at 02:46 PM.
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