What's The Prop Shaft Diameter On the Yanmar 3GMF?

[Joe Mullee]

I can't remember if it's 1" or 1.25". Can someone help me out?

Thanks,
Joe Mullee

 

[Steve Dion]

one inch.

 

[Rocket1]

Joe-

I have a 3GM30F in a 2000 340, and it has a 1" shaft. Pretty sure that's fairly standard for that motor. Hope that helps.

 

[Joe Mullee]

Thanks Steve and Rocket.

 

[kmart]

Errr. When I buy shaft zinks they are 7/8". And they fit perfectly.

 

[kloudie1]

Joe, 1" is the size on my 34..

 

[richk]

1" on my H35

 

[Dan Johnson]

One inch, Joe

:dance:

 

[Claude L.-Auger]

Errr. When I buy shaft zinks they are 7/8". And they fit perfectly.

Kmart your 7/8" shaft might have been replaced by a PO. All 2 GM20 and 3GM30 installed by Hunter in that era were using 1" shafts. As is mine also. And the one time I mistakenly grabbed 7/8" zincs at the chandler, they did not fit properly as there was a gap between the two halves.
I could possibly have successfully closed that gap by tightening the 2 stainless machine screws beyond normal but felt that I would weaken the zincs themselves by forcing them to open up more than designed for. The one inch zincs fit like a glove.

 

[Steverhnm]

One inch on my 1990 35.5 with 3GM