Impeller change question

Discussion in 'General Maintenance/Repair Questions' started by BaRS, May 26, 2023.

  1. BaRS

    BaRS New Member

    9
    May 15, 2023
    2020 320 Sundancer
    6.2 Mercs
    Hi guys. I’m changing the impeller drive shaft (bearings blew up in housing) on my 2020 320 sundancer with 6.2 IB’s with 250 hours. I have the impeller in as far as it will go in and it still sticks out of the housing about an 1/8 of an inch. Is this normal? When I was looking for the shaft repair kit two different dealers cross referenced and it was the same impeller so I’m confident it’s the right one.
     
  2. Phil S

    Phil S Well-Known Member

    Oct 16, 2020
    Taxachusetts
    Former 2004 300DA

    BW 210 Montauk
    BW 130 S/S
    Sundolphin 9.4 Tender
    Merc 200/40/9.9
    Do you have the old impeller to compare? And did you replace anything else like the wear plate?
     
    Bill Curtis and BaRS like this.
  3. Scott215

    Scott215 Well-Known Member

    622
    Jun 4, 2022
    2006 215 weekender 5.0 mpi
    5.0 mpi alpha 1 gen 2
    I thought they made a shorter one if you replace the scored plates
     
    Bill Curtis and BaRS like this.
  4. boatrboy

    boatrboy Well-Known Member

    Oct 3, 2006
    Orange, CT
    2006 340 Sundancer
    Twin 8.1 Horizons with V-Drives
    BaRS likes this.
  5. BaRS

    BaRS New Member

    9
    May 15, 2023
    2020 320 Sundancer
    6.2 Mercs
    Thanks guys. I didn’t get the whole replacement with the plates…just importer and gasket. I compared the two impellers and the new one is actually an 1/8 of an inch narrower. It still stuck up an 1/8” above the housing though? Strange, I wouldn’t think you want it rubbing that much. I will get new plates this fall if I don’t have problems first. They def had some wear marks on them. I wonder if it was changed before and that’s why the bearings blew out? I said 260 hours earlier but I meant to say 160.
     
  6. boatrboy

    boatrboy Well-Known Member

    Oct 3, 2006
    Orange, CT
    2006 340 Sundancer
    Twin 8.1 Horizons with V-Drives
    You stated the bearing blew up so are you rebuilding the existing pump with new bearings and seals? Do you have a pump with the plates on both sides? Something sounds amiss to me.
     
  7. BaRS

    BaRS New Member

    9
    May 15, 2023
    2020 320 Sundancer
    6.2 Mercs
    I pulled the front of the housing off and changed the shaft, bearings, seals, and impeller. I did not change wear plates. They were scuffed up but usable for now.
     

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