On Sat, 17 Sep 2005 15:53:30 -0400, Larry wrote:

Larry wrote in :

The housing is stainless steel. You still want to protect the bolts
going in, but they use something like blue loctite to prevent their
vibrating out. You couldn't separate the pump from the engine without
taking the engine out of the boat. That would be really difficult - I
hope I never have to do that. I don't think there is a rear seal,
instead a shaft comes down vertically from the engine and engages a
right angle drive which turns the pump rotor.


The bearing I'm talking about is AFT of the impeller, running in a high
pressure zone in the impeller's outlet. The seal is on the forward end of
the stator vanes, right behind the impeller. This bearing, by the way, is
necessary to hold the impeller straight in the hole it sits in, keeping it
from touching the walls around it.

I tried to answer this earlier, but something ate my response.

The shaft descends vertically from the engine fore of the pump. Water is
pulled up through the grate and propelled out directly aft. It probably
uses the wear ring you mention. I didn't see a stator, but I'll have
another look.


I still doubt old Brunswick made a pump out of solid stainless steel.
Noone could afford to buy that much machine work. It might have a
stainless sleeve inside the pump around the impeller jetskiiers call a
"wear ring". "Things" in the water get wedged between the impeller and its
wear ring which is what causes the circular gouges you see in the pump.

Brunswick sold Mercury to Bombardier several years ago. I believe
Bombardier also owns Johnson and Evninrude - what used to be Outboard
Marine. Bombardier also owns SeaDoo.

My experience with rocks was that they wedged between the impeller and the
wear ring you speak of. I didn't get any gouges and the net effect of the
experience seems to be the loss of 1 knot of speed.

The rear bearing still requires maintenance...as does its pump bearing
seal. Order the service manual from the dealer or Merc and do it very
carefully.

That's a great idea - I'm going to do it. Also it will tell me how to fog
the motor. I had the dealer do that last year and it cost me US$ 145.00
whcih seems like a lot for something that simple.
--

Larry
email is rapp at lmr dot com
09/18/05 11:01:07 AM