Yanmar 2GM20F - Transmission ratio?

Where the heck do I look on the transmission to find the ratio?

I see in the manual that there are 3 possibilities:

  • 2.21:1
  • 2.62:1
  • 3.22:1

Since I've gotta contort myself into some kinda Gumby inspired yoga position to get my head (or a cellphone camera) back there, I thought I'd ask if anyone knew where the info I was looking for is on the transmission.

 

Alex W

Super Anarchist
3,326
316
Seattle, WA
It's on the plate on the transmission, top center facing aft.  Easy to find in image searches, which is how I found this picture:

s-l300.jpg


 

Zonker

Super Anarchist
9,714
5,669
Canada
Lean over engine with phone in hand and keep taking pics until you get a clear shot of the plate. Angle the phone so the flash doesn't reflect straight back!

 

crankcall

Super Anarchist
1,631
192
Toronto
mine is on the side of the transmission case, easily visible from the cockpit locker, once you climb into the locker. 

Alternate idea is rent/borrow one of those flexible inspection cameras. I bought one for $149 on sale, has a three foot flexible gooseneck on the camera. paid for itself with one "how do i see inside that wall to find a plumbing drip moment, 3/4" hole beats 3ft hole

 




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