David,
My impellers live in a used mayonnaise jar with a half cup or so of
olive oil. I remove the impellers from the pump
so they are not scrunched up over the winter. FYI, I find it easier to
remove the impeller
after the pump is off the engine. After which I put the impeller into
the olive oil where it is now
lubricated for the spring start up if I decide to reuse it. There are
several impellers in the jar
for company over the cold and lonely winter. This procedure also affords
an opportunity to
inspect the pump's operation and the impellers condition. Leave the pump
off the engine for
the winter. Plug the pump outlet so the anti-freeze does not leak out,
wine cork should do it.
Ray Shibe
On Fri, Oct 19, 2012 at 1:37 PM, David Risch wrote:
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 <[email protected]>
Date: Fri, 19 Oct 2012 16:19:18 To: <[email protected]>
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:[email protected]] On Behalf Of Steve
Thomas
Sent: Friday, October 19, 2012 11:14 AM
To: [email protected]
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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