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  1. #1

    Join Date
    Oct 2014
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    18

    Polaris 750 Crankshaft Advice

    Need some advice from you guys.

    I have been given a 1994 750 for free, and realized there was water/oil mix in the crankcase. I have taken it apart today, drained it, and took a picture. I need your advice on where to go next with this Crank.

    There seems to be only surface rust, as it is easy cleaned.

    I have read about how devastating rust can be in those bearings, so I have couple choices.

    1. Clean it, and flush it, and take a chance.
    2. Rebuild it with new bearing.
    3. Buy a used crankshaft or bottom end.

    Used bottom end can be picked up for 200-250$, not sure on the price of the new bearing. Click image for larger version. 

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  2. #2
    BlueFishCrisis's Avatar
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    Aug 2011
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    Rebuilding takes a hydraulic press and alignment equipment. Unless you have access to this, you will not be able to rebuild yourself.

    Option 4 - Do a crankshaft exchange with SBT for about $300 and receive a freshly rebuilt and reconditioned crankshaft aligned with new bearings shipped to your door. You simply need to ship the old one back in the same box they provide, using the prepaid return slip they provide.

    I suggest option 4.

  3. #3
    Myself's Avatar
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    May 2007
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    Finish the teardown so you can feel the bearings by hand while turning them. I just took apart a 787 Seadoo that I'm refurbishing for my son. Crank looked as bad or worse. After a good cleaning all bearings are clean with no rusting and spin buttery smooth. Pics are on my page here https://www.facebook.com/TwinLakesJetSkiRepair
    Sometimes there's just enough oil in the mix to keep the bearings from rusting.

  4. #4

    Join Date
    Oct 2014
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    18
    Any advice on which products to use for cleaning?

  5. #5
    Myself's Avatar
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    Using chemically resistant gloves I first use a solvent for cleaning all grease and oily residue. Diesel fuel works well in a ventilated area. I wash parts in an old stainless restaurant pan. It's about 14x24 and 3" deep. Use a cup to pour cleaner over the bearings while you spin them to flush them clean on the crank. A cheapo paintbrush with about 1/3 of the bristle length cutoff makes a good parts washing brush. Then a spray bottle of Castrol Super Clean and brush to finish off the cleaning with a good rinsing afterwards. Blow dry parts with compressed air followed by a bit of oil on bearings and cylinder sleeves immediately to stave off flash rust.

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