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Old 10-07-2014, 07:24   #1
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Yanmar transmission

Trying to figure out what type of fluid to put in the forward and reverse gear case of my yanmar 2gm20f engine. Thanks for any help!
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Old 10-07-2014, 08:42   #2
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Re: Yanmar transmission

Probably 30W engine oil for the 2gm. Yanmar presents confusing and contradictory information about my 3gm30f.
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Old 10-07-2014, 08:43   #3
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Re: Yanmar transmission

The service manual specifies SAE 23/30 oil. I use straight 30 weight synthetic in mine. Here is a link to the PDF service manual.

http://j30.us/files/YanmarGM&HMWorkshopManual.pdf
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Old 10-07-2014, 08:52   #4
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Re: Yanmar transmission

Also there is a placard riveted to the starboard side of the trans with model, specs, lube, etc.
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Old 10-07-2014, 09:07   #5
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Re: Yanmar transmission

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Originally Posted by georgelieber View Post
The service manual specifies SAE 23/30 oil. I use straight 30 weight synthetic in mine. Here is a link to the PDF service manual.

http://j30.us/files/YanmarGM&HMWorkshopManual.pdf
So do you mix 3 parts 30w and 7 parts 20w to get SAE23?



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Old 10-07-2014, 09:12   #6
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Re: Yanmar transmission

Hahaha... yes that would do it!
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Old 10-07-2014, 09:27   #7
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Re: Yanmar transmission

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Hahaha... yes that would do it!


I admire your precision George! You can help me out on the boat anytime...

(PS: It's the CFr's like you helping out that make this place so great)
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