Snapped Raw Water Pump Shaft after 50 hrs

Discussion in 'General Maintenance/Repair Questions' started by Irie308, Aug 12, 2018.

  1. Irie308

    Irie308 Member SILVER Sponsor

    725
    May 28, 2013
    CT
    Boatless and currently in search of 420 or 480 DB
    350 Mercruisers V-drives
    Last spring I made the mistake of buying a raw water pump from WM. It was in a pinch so I was just glad they had one in stock. I believe its the sierra brand. This season after 50 hrs of use the shaft snapped on me while cruising. We were at the beginning of our 1 week vacation and fortunately I was able to get back up and running in a few hours with the aid of a rebuilt spare. The more i think about it the more annoyed I get that the shaft just broke. The bearings seems fine and there was no sign of leaks. It looks as if the metal just failed. I've called WM and they said i should have purchased the extended warranty. I'm going to call Sierra on this next, if nothing else just to make them aware of their poorly made product. So I post this partly to vent as well as a PSA about this product. rawater pump.jpg rawater pump2.jpg
     
  2. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    I have never seen a sheared raw water pump shaft before. I'm sure Sierra would be interested. If I was their supplier.....I would want to take a close look at that shaft.

    Send a letter to this guy: Benson Smith. He is CEO and Chairman of the Board of Teleflex. They own Sierra. I find that is the only way to get attention on a matter like this.
     
  3. kiloil

    kiloil Member

    191
    Sep 15, 2013
    Tallahassee, Florida
    2015 25' SLX 8.2L-SOLD
    BOATLESS
    I like it when they said "you should of bought the extended warranty" made me laugh!. Like the extended warranty would do anything for it
     
  4. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    I just took a closer look at your photo of the shaft......those look like vibration marks. Was the impeller loose on the shaft? Those are strange marks for 50 hours of use.
     
  5. MasterFab

    MasterFab Active Member TECHNICAL Contributor GOLD Sponsor

    Aug 17, 2010
    Wallkill, NY
    2002 340 Sundancer, Rescued, Restored, Modernized, and now Sold
    8.1L Horizons, ZF 63 V Drives
    Good thing you had a spare on board!

    Dale
     
    Irie308 and kvduff like this.
  6. Irie308

    Irie308 Member SILVER Sponsor

    725
    May 28, 2013
    CT
    Boatless and currently in search of 420 or 480 DB
    350 Mercruisers V-drives
    Hmmm...will take a closer look. Pump is at home but the impeller is on the boat.
     
  7. Irie308

    Irie308 Member SILVER Sponsor

    725
    May 28, 2013
    CT
    Boatless and currently in search of 420 or 480 DB
    350 Mercruisers V-drives
    Its good to "know a guy"!
     
  8. rcmafgny

    rcmafgny Active Member

    Oct 10, 2009
    Long Island, NY
    2008 33 Sundancer; Kohler Gen set; Simrad electronics
    Twin 8.1 Horizons w/ V Drives
    i'm going to send my old pumps to a guy to rebuild..........
     
  9. Irie308

    Irie308 Member SILVER Sponsor

    725
    May 28, 2013
    CT
    Boatless and currently in search of 420 or 480 DB
    350 Mercruisers V-drives
    So I went to WM and spoke to one of the managers who is very knowledgeable and much more helpful than most. He gave me a contact at Sierra to speak to. Long story short, Sierra replaced the water pump free of charge and stated that such a failure should never happen. They are going to examine the old one to see why it failed. For now the replacement will remain a spare as I don't completely trust it.
     
  10. PlayDate

    PlayDate Well-Known Member SILVER Sponsor

    Dec 25, 2006
    Washington DC
    1994 370 Express Cruiser
    454 Mercruisers
    That is great news. I have never seen anything like that with a raw water pump. I suspect a harmonic disturbance caused the shear but the guys at Sierra will get it figured out. It is also possible it was a defective shaft that already had a crack in it. It is good to see Sierra backs their products.
     

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