"Anders Lassen" anders.lassenNEJTILSPAM (at)adr.dk wrote in message
. ..

And: Should I do it? I mean - Is there any drawbacks in changing rotation?

Some transmissions, (as in some I/O units that I have had in the past) have
their forward and reverse gears/clutches identical. An example was a Volvo
I/O unit my dad had 30 years ago. You could move a part of the shift linkage
from the left side of the belcrank to the right side, swap the prop and
everything would be fine.

There are also a lot of transmissions where the forward and reverse circuits
are NOT equal. Velvet Drive transmissions are an example. The forward gear
is much more robust and more efficient. Reverse involves more gears and the
clutch is not anywhere near as robust.

If you are not sure that your transmission is happy with either direction
then you should not use the reverse pitch prop. I checked the Hurth web
site and found the following bit of information:

"These ratings allow full power through forward and reverse gear trains,
unless otherwise stated."

So, I believe the bottom line is that you need to check the model of your
transmission! Your best bet would be to contact Hurth directly:

http://zf-marine.com

If you can't get a satisfactory answer, I wouldn't risk it.

Rod