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Old 22-08-2014, 04:58   #16
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Re: Yanmar KBW20 transmission whining noice- normal?

The whine in ours is constant and varies with RPM. It actually sounds like a turbo might sound, except we have none.


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Old 22-08-2014, 06:24   #17
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Re: Yanmar KBW20 transmission whining noice- normal?

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Also, what does SOAP stand for? I am guessing oil analysis?


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Without looking it , up I believe it's Spectroscopic Oil Analysis Program, apparently there is more than one way to analyze oil, Spectroscopic is the one I'm familiar with, it's the one the Army uses and I think most accurate, SOAP of course is the acronym. If your going to pay for it, make sure its a Spectroscopic analysis.

You'd be surprised at how much you can tell from simply filtering your oil through a coffee filter, of course it takes something like acetone to thin the oil enough to go through the filter.
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Old 22-08-2014, 06:26   #18
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Re: Yanmar KBW20 transmission whining noice- normal?

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The whine in ours is constant and varies with RPM. It actually sounds like a turbo might sound, except we have none.


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Really sounds like gears, ever heard an automotive rear end that the gear lash wasn't correct?
does it change at all with transmission temp? Gears usually do, seems they whine worse when warm.
Of course this is all conjecture.
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