Yanmar transmission

[Mckelley]

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!

[DennisM]

Probably 30W engine oil for the 2gm. Yanmar presents confusing and contradictory information about my 3gm30f.

[georgelieber]

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

[georgelieber]

Also there is a placard riveted to the starboard side of the trans with model, specs, lube, etc.

[HappyMdRSailor]

Originally Posted by georgelieber

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?

[georgelieber]

Hahaha... yes that would do it!

[HappyMdRSailor]

Originally Posted by georgelieber

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)