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Old 09-05-2016, 09:48   #1
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Any help would be awesome

Hey all,

I need some advice. I have an old Yanmar 2QM15 that's having an issue. I took it out recently and it took a bit of coaxing to get started. When I have the shifter in "warm-up" it seems to rev fine (although not as responsive as normal), but when I put it in gear I get minimal power and no rev even at full throttle. It's also putting out a lot of black soot out of the exhaust. The fuel is fresh.

I'm thinking it's probably the fuel injector pump or the governor. Any ideas?
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Old 09-05-2016, 10:03   #2
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Re: Any help would be awesome

I think black smoke usually indicates a very rich mixture, too much diesel or not enough air. Always try the easy, cheap fix first. Any change the air intake is blocked? Maybe a bird moved in a built a nest?
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Old 09-05-2016, 10:13   #3
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Re: Any help would be awesome

or ..... very poor compression.
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Old 09-05-2016, 10:16   #4
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Re: Any help would be awesome

Air intake seems to be fine. There's nothing clogging it.
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Old 09-05-2016, 10:55   #5
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Re: Any help would be awesome

I am assuming from the context of the question that this is a recent and sudden phenomenon? If that is the case then I would look for something that could change suddenly and not a gradual issue like injectors slowly wearing or compression slowly getting worse.
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Old 09-05-2016, 19:28   #6
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Re: Any help would be awesome

Is the prop fouled. Will certainly yield black smoke and low revs...


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Old 09-05-2016, 19:47   #7
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Re: Any help would be awesome

Exhaust mixer elbow clogged-clean soot out
Stuck/varnished up injector - check each spray pattern
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Old 10-05-2016, 08:22   #8
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Re: Any help would be awesome

Check prop. I had similar situation and prob was covered in barnacles.
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Old 10-05-2016, 08:59   #9
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Re: Any help would be awesome

Quote:
Originally Posted by skipmac View Post
I think black smoke usually indicates a very rich mixture, too much diesel or not enough air. Always try the easy, cheap fix first. Any change the air intake is blocked? Maybe a bird moved in a built a nest?
Or Mud Daubers, wasps, They will build anywhere quickly. Maybe something as easy as they have obstructed the breather for you fuel tank.

Best of luck, I hope it is simple.
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Old 10-05-2016, 09:35   #10
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Re: Any help would be awesome

Your head gasket is blown and maybe the piston rings. That is if you are lucky.
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Old 10-05-2016, 09:48   #11
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Re: Any help would be awesome

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Is the prop fouled. Will certainly yield black smoke and low revs...
This is a very strong possibility.
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Old 10-05-2016, 11:34   #12
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Re: Any help would be awesome

Remove the injectors and take them to where they rebuild them to have them tested.

IF they are Bosch and they sent jets of fuel in four directions like a cross they need to be rebuilt: so they spray a mist instead. I had to do this to my Volvo. It would not start before injector rebuild. fired on the second revolution after. So start with the injectors before worrying about the pumps.
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Old 10-05-2016, 14:47   #13
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Re: Any help would be awesome

Cool. Thanks for the input. I'll check all that good stuff.
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Old 10-05-2016, 15:38   #14
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Re: Any help would be awesome

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Cool. Thanks for the input. I'll check all that good stuff.
Had she not been run for awhile. Look at the bright side not the doom and gloom.
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Old 10-05-2016, 16:01   #15
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Re: Any help would be awesome

Is boat in the water? If so how long has it been since the motor was run? If it's been many months you have growth on the prop.
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