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Old 20-01-2018, 16:42   #1
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Yanmar 1GM10 issues

Hi,
I have a Yanmar 1GM10 1 cylinder diesel engine.
I had a loss of power the other day and small amounts of black soot come out of the exhaust. The raves didn't seem to go up when applying power.
Any ideas where to start?
Rene
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Old 20-01-2018, 17:22   #2
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Re: Yanmar 1GM10 issues

Id start by making sure prop is clean, then is the fuel filter, and finally the exhaust elbow.
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Old 20-01-2018, 18:04   #3
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Re: Yanmar 1GM10 issues

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Originally Posted by a64pilot View Post
Id start by making sure prop is clean, then is the fuel filter, and finally the exhaust elbow.
I agree except I would do in the reverse order; regardless, these are most likely culprits.
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Old 20-01-2018, 18:31   #4
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Re: Yanmar 1GM10 issues

I went that order for ease of work, simplest to hardest.
Usually I go from cheapest to most expensive, but thankfully, no real money here.
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Old 20-01-2018, 21:46   #5
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Re: Yanmar 1GM10 issues

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I went that order for ease of work, simplest to hardest.
Usually I go from cheapest to most expensive, but thankfully, no real money here.
Can't argue with that logic
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Old 21-01-2018, 04:49   #6
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Re: Yanmar 1GM10 issues

Greetings and welcome aboard the CF, Rene.
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Old 21-01-2018, 05:23   #7
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Re: Yanmar 1GM10 issues

Have you discovered anything? I've been rebuilding my similar SB12 and an interested in your situation.
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Old 21-01-2018, 05:38   #8
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Re: Yanmar 1GM10 issues

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Originally Posted by a64pilot View Post
I went that order for ease of work, simplest to hardest.
Usually I go from cheapest to most expensive, but thankfully, no real money here.
That's how I do it.
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Old 21-01-2018, 14:51   #9
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Re: Yanmar 1GM10 issues

Thanks all for your advice; I appreciate it...
I will order those parts and anything else a service will demand.
Then gloves on and on with it...
I have seen some YouTube videos on all this so I will be OK
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Old 21-01-2018, 15:07   #10
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Re: Yanmar 1GM10 issues

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Originally Posted by RenoirIII View Post
Thanks all for your advice; I appreciate it...
I will order those parts and anything else a service will demand.
Then gloves on and on with it...
I have seen some YouTube videos on all this so I will be OK
Shouldn't need too many parts.

The exhaust elbow (mixing point) should be able to be clean if clogged. It will be obvious once you get it off the engine. You may need to replace the gasket.
I think the Yanmar part number for the gasket is 128170-13201 but do check first.

You will have an engine mounted fuel filter and it's part number should be 104500-55710; again check before buying. There could well be another fuel filter mounted externally to the engine, often a Racor or CAV etc; it won't be hard to find.

Assuming your 1GM10 is raw water cooled (most are?), this is a good time to replace the zinc anode in the engine - P/N is 27210-200300. Pretty sure the 1GM10 only has single anode.

Good luck with it

EDIT: throw in a new water pump">raw water pump impeller if you haven't already done so
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Old 31-01-2018, 19:57   #11
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Re: Yanmar 1GM10 issues

Thanks all for your suggestions.
I had the boat out of the water and the prop had a good feed of mussels on it: biggrin:
Also cleaned the exhaust elbow which looked to be OK (I think it was not the original).
Back in the water now and going very nicely.
Only issue is the cold starting which requires some 10 to 15 seconds.
I think it may be the bleeding screws as there is a bit of fuel on the second screw.
Talked to local supplier but we could not find a replacement part.
I would like to replace all 3 if we can get the part numbers.
Thanks again...
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