[Sentoa] leaking seawater pump on Lugger M643 gen set

[Chip Van Gunten]

Dear Tom,
The paper gasket is sufficient to seal the cover if everything is clean and the surfaces are flat. You have a couple of options as far as the shaft seal leaking.

1.    Have the existing pump rebuilt replacing the shaft seals, bearings, and check to see if there is wear or pitting on the shaft itself.

2.     Northern Lights has an updated pump available, 25-12007, for this model generator. The pump also fits models M673. This pump has a ceramic mechanical shaft seal that will last considerably longer than the rubber lip seals found on the older pumps. The price for the new pump is most likely less than buying seals and possibly a shaft plus the labor to rebuild it.

Chip Van Gunten
Northern Lights

From: sentoa-bounces+chipv=northern-lights.com at lists.samurai.com [mailto:sentoa-bounces+chipv=northern-lights.com at lists.samurai.com] On Behalf Of Tom Gibson
Sent: Thursday, May 21, 2009 10:05 AM
To: South East Nordic Tugs Owners' Association (SENTOA)
Subject: [Sentoa] leaking seawater pump on Lugger M643 gen set

Hello All,
I've just replaced the impeller and end cover paper gasket on the seawater pump on the Lugger / Northern Lights 5kw gen set (Model M643) Now she's leaking worse than ever and seems to be coming from the back of the pump. My questions are:
- is the thin paper gasket enough to seal the cover plate to the body of the pump or should I use a little silicon blue or other gasketing product?
- when others have changed the impeller, have you also changed the 2 "lip seals" (Part # 25-18310) that go behind the impeller and look like they stop water from exiting through the back of the pump?
Thanks in advance for the help and unfortunately we won't be able to make the Roche Harbor get together this year, hopefully next.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.samurai.com/pipermail/sentoa/attachments/20090521/e6678f06/attachment.html>