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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar 1GM10 won't start.
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Thread: Yanmar 1GM10 won't start. Reply to Thread
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Topic Review (Newest First)
08-08-2013 03:43 PM
smurphny
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.
08-08-2013 02:20 PM
lawsonmitchell
Re: Yanmar 1GM10 won't start.

GRIM news. It's compression. Shite.
07-27-2013 09:15 PM
wescarroll
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.
07-23-2013 09:26 PM
hank9752
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
07-22-2013 10:08 AM
lawsonmitchell
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.

Thanks,
Lawson
07-22-2013 09:06 AM
bljones
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.
07-21-2013 10:12 PM
arvicola-amphibius
Re: Yanmar 1GM10 won't start.

Go to the other thread on Yanmar starting and try the technique of warming it on compression then using full throttle. If that won't start it, then look for something else. Diesels rarely run perfectly one day and fail the next, so don't fear the worst just yet. Possibles:

Fuel is contaminated - high pressure filter (the one on the engine) partially blocked
Air intake is blocked (the foam self-destructs over time)
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.
07-21-2013 12:58 PM
lawsonmitchell
Re: Yanmar 1GM10 won't start.

Definitely getting good fuel all the way to the good injector. No air. Still stumped.
07-21-2013 09:41 AM
JimsCAL
Re: Yanmar 1GM10 won't start.

I agree it sounds like a fuel issue. Also sounds like this didn't occur after a maintenance activity like changing a fuel filter. Air in the system would seem to be the most logical issue. And you got good advice about keeping the water intake seacock closed while cranking. You don't want to get seawater into the engine.
07-20-2013 10:25 PM
arvicola-amphibius
Re: Yanmar 1GM10 won't start.

Have a read of other threads here relating to 2 GM and 3 GM as they all work fairly much the same way; can all be a bit tricky to start in very cold weather. Work through one issue at a time. Check for something really simple to begin with, like the decompression lever (or a valve) stuck open. That one will be obvious because you will be able to spin it over by hand.

While you are messing around cranking it over, keep the seacock CLOSED because if you haven't yet got water in the cylinder you sure don't want to add that to your woes. Just remember to open it as soon as the engine does fire up.
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