Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Cooling System

Thread Tools Display Modes
  #1   IP:
Old 07-26-2020, 08:19 PM
Gregswetka Gregswetka is offline
Join Date: Aug 2018
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Water dripping from water pump

I have water dripping from my water pump. It does not appear to be from the impeller cover. It seems to be more from the side and bottom of the pump, (I didn’t have a mirror handy to get a good look). The engine is a 1974 vintage. What should I be looking for and what kits might I need to stop this leak and should I be concerned about repairing it now, or can it wait until the end of the season? It is about a drip every 2 seconds, and only when the engine is running.
Reply With Quote
  #2   IP:
Old 07-26-2020, 11:06 PM
Al Schober's Avatar
Al Schober Al Schober is offline
Afourian MVP
Join Date: Jul 2009
Location: Uncasville, CT
Posts: 1,668
Thanks: 9
Thanked 277 Times in 216 Posts
I'm assuming this is the Oberdorfer pump, not the new one from Moyer.
If so, your inner seal is leaking. You can remove the pump (not a fun job), replace the inner and outer seals (while you're in there, do both), then reinstall the pump. Don't be surprised if you're doing the job again in another month or two, but this time you'll get smart and replace the shaft too. I've been down this rabbit hole - even converted one pump to use Parker Molythane V packings! Didn't work..
I suspect every Oberdorfer 203 pump on our engines is at least 40 years old. Correct me if I'm wrong. Anyway, the cast body of the pump wears out and the only way to fix it is to replace it. You're going to be getting a new pump sooner or later - do it now and enjoy the difference.
Reply With Quote
  #3   IP:
Old 07-27-2020, 01:01 PM
capnward's Avatar
capnward capnward is offline
Afourian MVP
Join Date: Aug 2012
Location: Deer Harbor WA
Posts: 260
Thanks: 19
Thanked 83 Times in 65 Posts
Fix it now

If the leak is not from the impeller cover, it is from the seals which are worn. The repair may be as easy as replacing the seals. This is not something you can put off indefinitely. If you let the seals get worse, they will eventually leak so much that water will be forced into the bearings, and the bearings will seize up. This could happen without warning. Then you will have to replace seals, bearings, and probably the shaft. At that point you will wish you had a new pump ready to go. You should always have a spare, like new pump on board, along with repair parts, especially seals and impellers. This scenario just happened to me with the raw water pump, and it has happened before with the fresh water pump. Another experience of mine; worn seals in a fresh water pump can also inject water into the crankcase via the accessory drive. If you are timely with the seal repair you will not need a new shaft or bearings, and the pump body should be good for many years of replacing other parts.
Reply With Quote
  #4   IP:
Old 07-27-2020, 01:26 PM
Afourian MVP, Professor Emeritus
Join Date: Nov 2008
Posts: 3,217
Thanks: 39
Thanked 623 Times in 468 Posts
If the pump is leaking water onto a near by engine mount the resulting corrosion will make it impossible to adjust or easily remove the mount later.


Last edited by JOHN COOKSON; 07-30-2020 at 12:30 AM.
Reply With Quote
The Following User Says Thank You to JOHN COOKSON For This Useful Post:
Peter (07-27-2020)

Thread Tools
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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Water Pump issue Concord Troubleshooting 3 04-28-2014 04:34 PM
Water Pump Mystery - Running out of ideas Clucas Troubleshooting 15 05-16-2013 09:16 PM
leaking water pump rogers jolly General Interest 9 04-25-2011 08:49 PM
early water pump question breweraz Cooling System 1 05-24-2010 02:19 AM
universal UJ-61 water pump Dromo General Interest 5 05-09-2010 10:37 AM

All times are GMT -4. The time now is 11:34 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2020 Moyer Marine Inc.

All Rights Reserved