Yes but use a water-based lube...KY etc...(Let the jokes start here). I could
be wrong but I fear petroleum based products may adversely affect rubber.
1981 40-2
David F. Risch
(401) 419-4650 cell
-----Original Message-----
From: Rick Brass <rickbr...@earthlink.net>
Date: Fri, 19 Oct 2012 16:19:18
To: <cnc-list@cnc-list.com>
Subject: Re: Stus-List Miscellaneous -impeller
I has a similar experience a couple of months ago. My Universal M35B was out of
the boat for replacement of a broken motor mount. When the engine was started
at launch, no water came out of the exhaust.
We started checking the usual suspects to diagnose the problem and finally
determined there was no water output from the raw water pump. The impeller
looked great - only 108 hours on the engine after all - so we were going to put
it back in the pump. In the process of turning it into the cavity in the pump,
we noticed that the hub turned but the vanes did not. On closer inspection the
hub had lost its bond with the rubber part of the impeller.
Our guess is that the vanes had excessive friction against the cavity of the
pump while still dry , and the torque at startup broke the bond. So we
installed the new impeller with LOTS of grease in the cavity. And I will
remember the incident when I replace the impeller in a year or two.
Rick Brass
Washington, NC
: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Steve Thomas
Sent: Friday, October 19, 2012 11:14 AM
To: cnc-list@cnc-list.com
Subject: Re: Stus-List Miscellaneous -impeller
I helped a friend of mine bring a new to him Cal 25 from Munro Michigan to Port
Stanley last year.
He had a borrowed Mercury outboard which he freshened up with spark plugs, raw
water impeller, and I don't remember what else.
He also tested it out both in a barrel and on the boat when we got over
to Michigan.
We left Munro, no wind, and about an hour out into the channel the motor
started to falter and after a few starts and stops we hauled it aboard and
disassembled it in the cockpit.
Since the exhaust exited underwater, it was not immediately apparent to us that
the problem was the cooling system.
To make a long story shorter, the new impeller had failed by the rubber coming
unstuck from the brass centre.
It was a brand name part, and not a knock off.
Never expected that sort of failure, and I don't know how you could protect
against it except by keeping a spare on board, perhaps of a different
manufacture date.
Steve Thomas
C&C27 MKIII
Port Stanley, ON
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