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Old 30-07-2013, 16:21   #16
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Re: Loud Banging from a Yanmar 2gm20

Maybe it wants to make little Yanmars?
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Old 30-07-2013, 16:26   #17
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Re: Loud Banging from a Yanmar 2gm20

Sounds normal to me.......
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Old 30-07-2013, 20:12   #18
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Re: Loud Banging from a Yanmar 2gm20

Quote:
Originally Posted by Tellie View Post
When was the last time the valve lash was checked?
don't know honestly, but will make note of it... thanks Tellie!

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Originally Posted by Rick Scali View Post
Hello Salted, I have a 2GM and it sounds about the same. I have had for 10 years now and just keeps plugging away.
thanks Rick... I'm beginning to see that now, perhaps should look into soundproofing...

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Originally Posted by nimblemotors View Post
There is a fix to the loud banging sound from the engine, which is to convert to electric propulsion.
That has crossed my mind....

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Originally Posted by sigmasailor View Post
Sounds like a normal 2 cylinder diesel to me.
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Sounds normal to me.......
haha... ok. maybe it's just me.
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Old 01-08-2013, 16:12   #19
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Re: Loud Banging from a Yanmar 2gm20

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that's what the previous owner said too, but part of me just can't imagine/accept an engine designed to make such a racket... hence this thread

Yes, she does do 5-ish +-, and I'll look for bouncing too, this weekend...
thats why i asked - i have a 2qm20 on my boat and it sounds like theres a jackhammer in the big end when i start it, settles down to gentle carcrash as it warms up a bit - these old 2 cyl diesels sound awful but - they go fine. If it started to make a LOT more noise, I'd say worry, but if it just seems really loud but goes ok it probably is. Remember its a compression ignition engine - no glow plugs, so seriously high compression heads, but they are designed to run like this. If you get a chance to get someone trustworthy with experience of these engines to have a listen to it, that might be worth your while, hopefully just to set your mind at ease.
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Old 04-08-2013, 06:42   #20
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Okay, it was running low at 800, and indeed was bouncy. The right rpm is supposed to be 825-875 I gathered, and once adjusted, it was markedly improved. Will probably take more time to learn abt them!

Thanks guys!
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Old 05-08-2013, 02:21   #21
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Re: Loud Banging from a Yanmar 2gm20

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Originally Posted by Salted View Post
Okay, it was running low at 800, and indeed was bouncy. The right rpm is supposed to be 825-875 I gathered, and once adjusted, it was markedly improved. Will probably take more time to learn abt them!

Thanks guys!
Good one .
Next thing to do is to run it with a clean bottom and prop and note if you get any significant vibration at different RPM settings. Make a note of any rev range where it vibrates too much and avoid those power settings.

It is not uncommon to have one or two spots where significant vibration occurs; for instance I have to avoid 2500 but its fine at and below 2200 and above 2700.
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