"Dr. Di" wrote in message
...
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 had a somewhat smaller Hurth (28 hp) that slipped and this caused a delay
in engagement although it did finally pick up the drive but it was a worry
especially in docking situations and I could never be quite sure when
revving up the engine whether the extra revs were in fact being transmitted
to the prop or whether the extra torque was causing more slippage..
Spoke to a Hurth engineer who said that the clutch plates has probably come
to the end of their life and needed changing. Maybe the previous owner of
the boat had not slowed the engine before going from ahead to astern.
Anyway, the bad news was that the cost of the new plates plus labour meant
that it was more economical to replace the whole box at a cost of about
£900.
Considring this, plus the hassle of getting the engine out from under the
cockpit to remove the box I decided to put back a new engine and gearbox
while Ii was at it as this would add value to my yacht as well as ensuring
reliability.
These boxes are small and precision made and should engage with a hard
'click' and no slippage so I cannot offer much hope for an easy solution..