I didn't measure the differences in shaft speed, mainly because I have
no way to do it.. But the transmission overheats, and the boat speed
through the water decreases without any change in engine RPM's..

Thanks for your input Bruce, as well as everyone else who attempted to
help.. I guess it's time to consider pulling and rebuilding the
transmission..

Are you really in Bangkok? I think Thailand is a great place to visit,
with very friendly people... At least I found it so...

Diana

On Tue, 18 Mar 2008 09:36:53 +0700, Bruce in Bangkok
wrote:

On Mon, 17 Mar 2008 15:20:30 -0400, Dr. Di
wrote:

Does anyone have experience with an anti-slip additive for marine
transmissions? We have a Hurth HBW-150 R2 transmission that is
slipping, and we may have to alter our cruising plans as a result.. I
really don't want to continue without a workable transmission as I've
seen too many situations where sail alone was inadvisable, especially
in some of the Bahama cuts..

We changed the fluid, checked the linkage, and have been babying it
since first noticed.. It doesn't have an oil cooler, and I'm aware
that might help, but what we have is what we have..

Anyone with suggestions?

Diana

I guess the first question is how do you know that it is slipping?

But if you are positive that the transmission is slipping then the
only solution is to rebuild it. A Hurth is a very simple transmission
- two clutch packs and a second shaft and gear set to reverse the
output rotation. If it is slipping then the clutch plates are worn and
nothing you can do is going to make any real difference.

An oil cooler won't make any difference at this stage but if you do
rebuild then adding a cooler might make the rebuilt box last longer
next time.

Foley Marine is a good source of parts and information regarding Hurth
boxes although there are plenty more on the net.

http://www.foleyengines.com/Home.aspx


Bruce-in-Bangkok
(correct email address for reply)