Results 1 to 6 of 6

Thread: Oberdorfer raw water pump leaking water

  1. #1
    New Member windblown's Avatar
    Join Date
    Sep 2016
    Location
    Rochester, NY
    Posts
    4

    Oberdorfer raw water pump leaking water

    We replaced the impeller on our Oberdorfer raw-water pump two days ago (Universal Mx25, Ericson 32-3). It went reasonably well, though getting the snap ring back on was quite challenge. Since then, we see a steady drip of water (when the engine is running) from the bottom of the pump where it attaches to the engine. We have tightened the nuts there as much as we can, but they are very hard to get to. It's possible that we had this leak before changing the impeller, and we missed it. The raw water is certainly flowing better now, judging from the output. What does the leak mean? Do we need to pull the raw-water pump?
    Deborah
    Ericson 32-3
    ”Tradewinds”
    ERY32612M85A
    Universal M25

  2. #2
    Moderator Christian Williams's Avatar
    Join Date
    Oct 2012
    Location
    Los Angeles
    Posts
    4,084
    Blog Entries
    78
    If the leak is the mating of the Oberdorfer with the engine block, you may need a new gasket. The pumps are quite easy to take off and put back on.

    If the drip is coming out of the shaft, through the opening on the underside, it may be that the bearing is shot. That happened to me. It drips and slowly gets worse. You can rebuild the pump. I bought a new one.

    The leak is apparently not coming from the face plate that accesses the impeller, because that would be easy to see.

    http://www.ericsonyachts.org/infoexc...mp-Replacement
    Last edited by Christian Williams; 07-20-2019 at 02:58 PM.
    Thelonious II, E381 hull 513 (1984) Universal 5432
    Table of Contents for Thelonious Blog here
    Videos: http://www.youtube.com/c/ChristianWilliamsYachting

  3. #3
    New Member windblown's Avatar
    Join Date
    Sep 2016
    Location
    Rochester, NY
    Posts
    4
    Quote Originally Posted by Christian Williams View Post
    If the leak is the mating of the Oberdorfer with the engine block, you may need a new gasket. The pumps are quite easy to take off and put back on.

    If the drip is coming out of the shaft, through the opening on the underside, it may be that the bearing is shot. That happened to me. It drips and slowly gets worse. You can rebuild the pump. I bought a new one.

    The leak is apparently not coming from the face plate that accesses the impeller, because that would be easy to see.

    http://www.ericsonyachts.org/infoexc...mp-Replacement

    Thank you so much. I will double-check exactly where the drip is coming from, and then try the gasket replacement. My tendency would be to buy a new pump rather than rebuild. Seems like a new pump every 34 years is a reasonable investment.
    Deborah
    Ericson 32-3
    ”Tradewinds”
    ERY32612M85A
    Universal M25

  4. #4
    Moderator Christian Williams's Avatar
    Join Date
    Oct 2012
    Location
    Los Angeles
    Posts
    4,084
    Blog Entries
    78
    See PP 26-27 of this manual: https://www.westerbeke.com/operator'...erator_man.pdf

    (I happen to be deep into this manual myself today)
    Thelonious II, E381 hull 513 (1984) Universal 5432
    Table of Contents for Thelonious Blog here
    Videos: http://www.youtube.com/c/ChristianWilliamsYachting

  5. #5
    Principal Partner Alan Gomes's Avatar
    Join Date
    Mar 2012
    Location
    San Pedro, CA
    Posts
    729
    Quote Originally Posted by windblown View Post
    Thank you so much. I will double-check exactly where the drip is coming from, and then try the gasket replacement. My tendency would be to buy a new pump rather than rebuild. Seems like a new pump every 34 years is a reasonable investment.
    Or, one other option might be to ship it off to Depco Pump for a rebuild.
    Alan Gomes
    1984 E26-2
    Yanmar 1GM
    San Pedro, CA

  6. #6
    New Member windblown's Avatar
    Join Date
    Sep 2016
    Location
    Rochester, NY
    Posts
    4
    Quote Originally Posted by Alan Gomes View Post
    Or, one other option might be to ship it off to Depco Pump for a rebuild.
    I like this idea to have the rebuilt pump as a spare. Also, might consider tinkering with it a bit as a winter project. (Although, the winter project list is long. . . )
    Deborah
    Ericson 32-3
    ”Tradewinds”
    ERY32612M85A
    Universal M25

Similar Threads

  1. M25 Water Pump--Oberdorfer
    By Christian Williams in forum Maintenance & Mechanical
    Replies: 3
    Last Post: 09-26-2018, 02:25 PM
  2. Atomic 4 Water Pump Leaking
    By Unsettled1 in forum Design & Function
    Replies: 1
    Last Post: 06-25-2015, 04:19 PM
  3. Gasket material for Oberdorfer raw water pump/impellor?
    By Frank Langer in forum Maintenance & Mechanical
    Replies: 11
    Last Post: 10-08-2013, 07:41 AM
  4. Oberdorfer Water Pump
    By Brian K in forum Maintenance & Mechanical
    Replies: 7
    Last Post: 10-01-2008, 11:39 AM
  5. Oberdorfer Raw Water Pump Wear
    By Sean Engle in forum Maintenance & Mechanical
    Replies: 0
    Last Post: 10-17-2004, 09:52 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •