There are two possibilities that come to mind. The prop has a neropreme
insert between the splined coupling and the propeller to absorb shock. They
sometimes wear out and cause slippage as you mention. In which case a prop
shop can install a replacement insert. The other and less likely is the
splined coupling on the crankshaft of the engine. The drive shaft to the
lower unit mates with this coupler. It is a neropreme filled cup that also
absorbs shock. This requires pulling the engine to replace the hub and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don Dando wrote:
There are two possibilities that come to mind. The prop has a neropreme
insert between the splined coupling and the propeller to absorb shock. They
sometimes wear out and cause slippage as you mention. In which case a prop
shop can install a replacement insert. The other and less likely is the
splined coupling on the crankshaft of the engine. The drive shaft to the
lower unit mates with this coupler. It is a neropreme filled cup that also
absorbs shock. This requires pulling the engine to replace the hub and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don,
It appears that my prop is missing what I would call an expansion ring
on the back hub of the prop where the exhaust comes out. Could that be
a problem?
Blackie

"Blackie" wrote in message
oups.com...

Don Dando wrote:
There are two possibilities that come to mind. The prop has a neropreme
insert between the splined coupling and the propeller to absorb shock.
They
sometimes wear out and cause slippage as you mention. In which case a
prop
shop can install a replacement insert. The other and less likely is
the
splined coupling on the crankshaft of the engine. The drive shaft to
the
lower unit mates with this coupler. It is a neropreme filled cup that
also
absorbs shock. This requires pulling the engine to replace the hub and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don,
It appears that my prop is missing what I would call an expansion ring
on the back hub of the prop where the exhaust comes out. Could that be
a problem?

Likely not related. Put your spare prop on, go for a boatride and see if the
problem persists. It's likely a worn hub and any (decent) prop shop can fix
it.

airborne wrote:
"Blackie" wrote in message
oups.com...

Don Dando wrote:
There are two possibilities that come to mind. The prop has a neropreme
insert between the splined coupling and the propeller to absorb shock.
They
sometimes wear out and cause slippage as you mention. In which case a
prop
shop can install a replacement insert. The other and less likely is
the
splined coupling on the crankshaft of the engine. The drive shaft to
the
lower unit mates with this coupler. It is a neropreme filled cup that
also
absorbs shock. This requires pulling the engine to replace the hub and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don,
It appears that my prop is missing what I would call an expansion ring
on the back hub of the prop where the exhaust comes out. Could that be
a problem?

Likely not related. Put your spare prop on, go for a boatride and see if the
problem persists. It's likely a worn hub and any (decent) prop shop can fix
it.


Any idea about the size of the nut that holds the prop on? I don't
think I have a socket to fit it.

"Blackie" wrote in message
ps.com...

airborne wrote:
"Blackie" wrote in message
oups.com...

Don Dando wrote:
There are two possibilities that come to mind. The prop has a
neropreme
insert between the splined coupling and the propeller to absorb
shock.
They
sometimes wear out and cause slippage as you mention. In which case
a
prop
shop can install a replacement insert. The other and less likely
is
the
splined coupling on the crankshaft of the engine. The drive shaft
to
the
lower unit mates with this coupler. It is a neropreme filled cup
that
also
absorbs shock. This requires pulling the engine to replace the hub
and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don,
It appears that my prop is missing what I would call an expansion ring
on the back hub of the prop where the exhaust comes out. Could that be
a problem?

Likely not related. Put your spare prop on, go for a boatride and see if
the
problem persists. It's likely a worn hub and any (decent) prop shop can
fix
it.


Any idea about the size of the nut that holds the prop on? I don't
think I have a socket to fit it.

Whenever you go boating (besides wearing PFDs), you should be carrying a
toolbox (so you can at least perform emergency repairs) and the tools to
install your spare prop (you know- that other prop you always carry with
you). If you're not already doing this, make sure you do the next time you
go out boating (to safeguard the trust your passengers place in you).

Pull up to an auto parts store and they'll be able to select the correct
size for you.

airborne wrote:
"Blackie" wrote in message
ps.com...

airborne wrote:
"Blackie" wrote in message
oups.com...

Don Dando wrote:
There are two possibilities that come to mind. The prop has a
neropreme
insert between the splined coupling and the propeller to absorb
shock.
They
sometimes wear out and cause slippage as you mention. In which case
a
prop
shop can install a replacement insert. The other and less likely
is
the
splined coupling on the crankshaft of the engine. The drive shaft
to
the
lower unit mates with this coupler. It is a neropreme filled cup
that
also
absorbs shock. This requires pulling the engine to replace the hub
and
require a hoist to lift the engine. Hope this helps.

Don Dando

Don,
It appears that my prop is missing what I would call an expansion ring
on the back hub of the prop where the exhaust comes out. Could that be
a problem?

Likely not related. Put your spare prop on, go for a boatride and see if
the
problem persists. It's likely a worn hub and any (decent) prop shop can
fix
it.


Any idea about the size of the nut that holds the prop on? I don't
think I have a socket to fit it.

Whenever you go boating (besides wearing PFDs), you should be carrying a
toolbox (so you can at least perform emergency repairs) and the tools to
install your spare prop (you know- that other prop you always carry with
you). If you're not already doing this, make sure you do the next time you
go out boating (to safeguard the trust your passengers place in you).

Pull up to an auto parts store and they'll be able to select the correct
size for you.


The nut turned out to be 1 1/6", but It's so tight I will need and impact gun to get it off.
I'll get my spare prop on this weekend to see if it corrects my
problem.