Well, the time has come to put out some really serious boat bucks. I am
about to order the Yanmar 4JH4. The clutch comes in two flavors, cone and
multi-plate. The cone clutch is about 3" shorter which would make life a
little easier but I am wondering what is the advantage of either type?

I will be using an Aquadrive cv joint/thrust bearing so there will be no
prop thrust on the transmission if that makes a difference.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

Glenn Ashmore wrote:
I will be using an Aquadrive cv joint/thrust bearing so there will be no
prop thrust on the transmission if that makes a difference.


Go with the cone then, a multi-plate clutch is mostly for buffering the
thrust loads under partial engagement.

The thrust bearing is a great idea, I wish our boat had one. Makes the
power plant a lot quiter and most of the attached ancillary equipment is
longer lived.

Fresh Breezes- Doug King

Glenn Ashmore wrote:
Well, the time has come to put out some really serious boat bucks. I am
about to order the Yanmar 4JH4. The clutch comes in two flavors, cone and
multi-plate. The cone clutch is about 3" shorter which would make life a
little easier but I am wondering what is the advantage of either type?

I will be using an Aquadrive cv joint/thrust bearing so there will be no
prop thrust on the transmission if that makes a difference.

No real world experience with these clutches but:

- I would suspect lower shifting effort for the multi plate
- I figure _maybe_ shorter lifespan for the cone, but you
would expect that Yanmar or the supplier has figured out to
design clutches by now.

Evan Gatehouse