Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-21-2020, 09:23 PM   #1
Senior Member
 
Bustlebomb's Avatar
 
City: Seal Beach, CA
Vessel Name: Snooker (for now.....)
Vessel Model: 1981 34 Californian LRC
Join Date: Feb 2014
Posts: 103
Raw Water Pump Rebuild

Iíve got a Northern Lights M643 5kw generator. After running last night, I noticed some water in the drip pan. It appears my raw water pump is leaking around the shaft. Since it hasnít run for a while, is this something that will fix itself with continued running?

If not, I see the rebuild kit is available from Diesel Parts Direct (great service and super quick shipping, by the way) but Iíve never done one of these before.

As Iím sure many here have probably done something similar, Iím looking for any tips or pointers. Any special tools needed?

Removal and installation looks pretty straightforward, but is there anything Iím missing?

Also, is there any better place to get the parts?

Thanks!Click image for larger version

Name:	IMG_5779.jpg
Views:	35
Size:	99.5 KB
ID:	109114
__________________
Advertisement

__________________
Matt

"You keep using that word. I do not think it means what you think it means."
Bustlebomb is online now   Reply With Quote
Old 10-21-2020, 11:14 PM   #2
Member
 
City: Poulsbo
Vessel Name: Water Music
Vessel Model: Grand Banks 49 classic
Join Date: Jun 2015
Posts: 22
I have the same pumps on a two Northern Lights gen sets. The ceramic seal requires careful installation. You need to have a tool that will slip over the shaft that is larger in diameter than the seal. The end surface of the tool needs to be flat. Carefully drive the seal into the housing with light hammer taps to the tool end. The seal will then be flush with the back of the housing. The kit will have new bearings and seals for the engine side also -- It took me about 30 minutes per pump to rebuild once I made the tools. Make sure you install all the bits and pieces in the correct order.
__________________

DennisB1 is offline   Reply With Quote
Old 10-21-2020, 11:46 PM   #3
Senior Member
 
guy with a boat's Avatar
 
City: SoCal and Vancouver Island
Vessel Name: Northern Sky
Vessel Model: Nordhavn 63
Join Date: Aug 2016
Posts: 199
Diesel Parts Direct is the best source that I have found for the parts. Removing and installing the bearings and seals is best done with a small press. Using a hammer is possible but tricky to do without damaging something. A large vice can serve as a press but an actual shop press makes it much, much easier.

My advice is buy a new pump to replace the old one. Then rebuild your old one and use it for a spare, which you will eventually need. Bearings last a long time and likely won’t need replaced unless the pump has really got a lot of hours on it. It will need new seals, wear plate and impeller. Buying the whole rebuild kit is one way to do it but more expensive than getting only the parts you need. You could buy the rebuild kit the first time, use the needed parts for the rebuild, and keep the rest for future repairs. Order replacements for the seals and/or other parts you needed from the kit and you will have the full kit for next time.

Over time the pumps will eventually leak so its nice to have 2 in rotation so you can always swap it out and do the rebuild when it is convenient.
guy with a boat is offline   Reply With Quote
Old 10-22-2020, 12:08 AM   #4
Senior Member
 
greatpapabear's Avatar
 
City: Beaucette Marina
Vessel Name: Play d'eau
Vessel Model: Fleming 55
Join Date: Jun 2008
Posts: 284
A leaking shaft is a warning sign that the seal(s) are about to fail which could result in sea water mixing with the engine oil. The cost of repairing this scenario is enormous.

Over the years, I've tried repairing pumps myself (not very successful) and then professionally (parts plus time). Now, with the price of pumps having dropped so much (I use Sherwood on my Cummins engines) it's just not cost effective to do anything but replace with a new pump.

Hence, I carry replacement pumps for the two Cummins and two generators. Interestingly, since I stopped repairing pumps, the time between failures has increased significantly! Success.
__________________
GPB
Follow our great adventures: www.playdeau.com
greatpapabear is offline   Reply With Quote
Old 10-22-2020, 01:39 AM   #5
Guru
 
Lepke's Avatar
 
City: Between Oregon and Alaska
Vessel Name: Charlie Harper
Vessel Model: Wheeler Shipyard 83'
Join Date: Jun 2016
Posts: 2,071
I've been rebuilding my pumps, raw and coolant since the 60s. For pressing bearings, etc., Harbor Freight sells an arbor press that's better than trying to hammer parts in place. I buy my bearings and seals online and only buy a kit if there's some damaged parts. If I only need bearings and a seal it costs less than $20 to rebuild any pump I have, currently Detroit, Onan or Perkins.

There are probably several videos on Youtube on rebuilding a pump similar to yours.
Attached Thumbnails
Arbor Press_sm.jpg  
Lepke is offline   Reply With Quote
Old 10-22-2020, 03:25 AM   #6
Guru
 
North Baltic sea's Avatar
 
Vessel Model: Nordic Tug 37
Join Date: Sep 2015
Posts: 943
Hi, a little next to topic,

Does anyone know who is the manufacturer of Northern Lights M643 5kw Generator basic diesel engine?

I suspect it was Kubota and NL marinated it? I have the same generator, but difficult / expensive to spare parts on this side of the world.
North Baltic sea is offline   Reply With Quote
Old 10-22-2020, 07:48 AM   #7
Newbie
 
Anniesez's Avatar
 
City: Fort Myers Beach, Fl
Vessel Name: Annie Sez
Vessel Model: Krogen 42
Join Date: Mar 2018
Posts: 3
My NL 753G's engine is made by Shibaura according to the plate mounted on the engine.
Anniesez is offline   Reply With Quote
Old 10-22-2020, 08:30 AM   #8
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 5,905
The NL 643 is a Shibaura 643.
Ski in NC is offline   Reply With Quote
Old 10-22-2020, 09:01 AM   #9
Guru
 
City: gulf coast
Join Date: Jun 2014
Posts: 3,257
DEPCO pump in Clearwater can do the rebuild. Those ceramic seals are picky and in my experience are best if run often.
bayview is offline   Reply With Quote
Old 10-22-2020, 11:50 AM   #10
Guru
 
Alaskan Sea-Duction's Avatar
 
City: Inside Passage Summer/Columbia River Winter
Vessel Name: Alaskan Sea-Duction
Vessel Model: 1988 M/Y Camargue YachtFisher
Join Date: Jul 2012
Posts: 6,168
Quote:
Originally Posted by bayview View Post
DEPCO pump in Clearwater can do the rebuild. Those ceramic seals are picky and in my experience are best if run often.
I agree. Call DEPCO and get a new pump instead trying to rebuild this old one. They are very friendly and helpful.

I had to do the same with my Onan. PITA changing it out.


Depco Pump Company
__________________

Alaskan Sea-Duction is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 07:30 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012
×