PROPELLER ROTATION

Zoe · Member

PROPELLER ROTATION

Farron Peffer · Veteran Member

Hello Zoe,

Great news on the new engine.

The ZF 45C must only be used with the shift lever in the (A) position for forward continuous propulsion. (see attachment)

As mounted in the vessel and viewed from astern, your engine will be turning clockwise.

With the marine gear ingaged in the forward (A Position) the gear output will also be clockwise. (see attachment)

A clock wise input to the Walter unit will give a counter clockwise output rotation to the prop shaft.

A counter clockwise prop shaft rotation will require a left hand propeller.

This is an interesting repower. Let us know how it comes out!

Zoe · Member

Hello Farron,
Thanks for the quick response to confirm my assumption as the right one.
Your right the re power is a interesting one as is the boat.
Brief history: 67 lapstrake wood 26' Trojan Express with many changes that include: West system inside & out, deeper keel running back to larger rudder, Command Bridge. extended hull incorporating swim platform, new deck to include raised foredeck. The old engine was a 302 Ford Mercruiser, I am keeping the stern gear with the 13" prop as most of this is quite new and to go bigger than say 14" would be a big expense for what I could gain. With the 1-1 ratio gearbox I figure I will max out at between 8-9 knots & cruise at 7 burning a LOT less fuel than the old 302.
Thanks for your interest and professional advice, this a great forum for getting answers.
Zoe

Annie in WA · Member

Farron,

We are in the process of installing a new Beta 38 in our sailboat with an existing Volvo MS2V transmission with a 2.37:1 gear ratio. It is a V drive installed with the Beta saildrive adaptor and it looks great sitting in on our engine bed. I'm at the point where I'm researching props. Am I right in assuming that the engine is a clockwise rotation as viewed from the gear side looking aft? If so, would that be a RH engine rotation which would normally call for a LH prop? If this logic is correct, we would prefer a RH prop, like our original prop. The possibility under discussion is whether the transmission could be run in continuous reverse to allow for a RH prop. We don't know if adjustments would need to be made (transmission pump change, maybe) or if the gear ratio is the same with forward or reverse. Would this be a question for a Volvo transmission mechanic? Any suggestions as to whom we could ask? Thanks in advance. Annie

Farron · Senior Member

Hello Annie,

I would advise you to discuss correct rotation of the MS2V with a Volvo Mechanic.

By looking at the design of the MS2V transmission it appears that it may be able to operate with either right hand propeller or left hand propeller for forward thrust.

Again, my best advice would be to discuss this with a competent Volvo Mechanic who is more familiar with the MS2V marine gear.

The Beta engine rotates counter-clockwise when looking directly at the flywheel.

Annie in WA · Member

Ah, that's right. Our engine is mounted backwards because it's a V-drive and it's all in how you look at it. Having the engine installed backwards has been a bit of an issue since the high rise exhaust elbow ended up under the flat companionway. Ethan suggested cutting the elbow at a weld and rewelding it so that it is a little lower and oriented better. That worked. We lost a little companionway wood, too. The exhaust hose ends up longer and we had to add another 3-meter length of wiring harness and a relay for the control panel. It's installed and looks good, though, and I'm sure a lot of installations need modifications. Thanks for the advice.