Help with impeller change -sherwood pump

Discussion in 'Sport Yachts/Yachts' started by Rssll45, Feb 22, 2017.

  1. Rssll45

    Rssll45 Member GOLD Sponsor

    Feb 16, 2009
    New Orleans
    1998 450DA
    Cat 3126
    We all know that changing the raw water impeller on the outboard side is a real pain. Part of the problem is the short throw of the wrench to turn the 1 1/8" bolt that pulls the impeller. I found on Home Depot's web site a 1 1/8" wrench with a wrachet on the closed end for only $22 (most I've looked at have been in the $70 range). This has to save a bunch of time. You may want to look into it.
  2. Stromeister

    Stromeister Member

    Oct 6, 2006
    Fallston, Maryland
    2003 410 Sundancer
    3126 CAT Diesels w/VDrives
    Do you have any part number or URL to reference?
  3. The Bill Collector

    The Bill Collector Well-Known Member SILVER Sponsor

    Jun 2, 2008
    Tacoma, WA
    450 Sundancer
    3126 Cat's
  4. Jaybeaux

    Jaybeaux Active Member SILVER Sponsor

    Jan 3, 2016
    Upper Potomac River
    420 Sundancer 2004
    Naught On Call
    Cummins 6CTA-8.3's with V-Drives
    9KW Onan Genset
    What length 3/4"-16 bolt with 1 1/8" head do you use? I just bought a 4" bolt that has 2" of threads.

  5. ttmott

    ttmott Well-Known Member

    Apr 3, 2012
    Space Coast Florida
    2006 52 Sedan Bridge
    Cummins QSM11
  6. Chicago_48

    Chicago_48 New Member

    Nov 22, 2016
    Chicago, IL
    2006 48 Sundancer
    Cummins QSC 8.3 HO's @ 540 HP
  7. Bow Tie

    Bow Tie Member

    Jan 5, 2014
    Key West & Naples, Fl.
    2004 500 Sundancer
    QSM11's 660hp
    Hi, my impellers use a large bolt with "no shoulder" they are threaded on the entire bolt. You can buy them online. I also use a 1.25" 1/2" drive socket, they take about 15 minutes to remove and install the new impeller. I also use a silicone penetrating spray very liberally in the vanes of the old impeller and spline, also spray on the new impeller going in. "If" you cannot remove the old impeller because it won't budge, try "bumping" the engine couple of times.

    The smx impeller use a different type of bolt/key slot, much better! Hope this helps. Also, the SMX impeller is better and will last longer that Sherwood.

    you should pull the impellers at least once a year to inspect for cracks, broken vanes, uneven "set" in the vanes from sitting too long. Great preventative maintenance and should never be neglected unless of course you don't mind getting stuck somewhere.

    Bow Tie
    Last edited: Mar 12, 2017

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