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  1. #1
    PWCToday Regular
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    Pump rebuild, is it difficult?

    Hi all,
    Never done a pump rebuild. Do I need special tools such as a hydraulic press? Or does the old heat up the holder and freeze the bearing system work?
    Are the old bearings hard to get out?
    I've rebuilt everything else on skis, just never a pump so looking for some insight before I start.
    Thanks in advance

  2. #2
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: Pump rebuild, is it difficult?

    A screwdriver at a minimum, I have used sockets and a long bolt to pull the bearings back into position (gently tapping around the perimeter with a screwdriver works too). Simple tools can get the job done, should be a 30 min job if the pump is on the bench already.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  3. #3
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: Pump rebuild, is it difficult?

    Use heat on the pump to install new bearings. Hand held propane, or map gas torch, and you will need little to no force to install bearings. It is really pretty simple, I am sure you can handle it.
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  4. #4
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    Re: Pump rebuild, is it difficult?

    Ok, thanks guys. Ya I figured it would be easy, I just didn't want to rip it all apart then realize I need a press or something. I've done motorcycle wheel bearings before, sounds similar. I'll heat up the pump and freeze the bearings, hopefully they'll drop right in.
    Appreciate the help. Cheers

  5. #5
    I dream skis
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    Re: Pump rebuild, is it difficult?

    I find that unscrewing the impeller from the shaft might be the hardest part. But in the end it always does pop loose. You need the spline-to-hex tool, or fabricate something with an old driveshaft spline.
    OLDGUY sez..... "The older I get, the better I was !

  6. #6
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    Re: Pump rebuild, is it difficult?

    Quote Originally Posted by OldGuy View Post
    I find that unscrewing the impeller from the shaft might be the hardest part. But in the end it always does pop loose. You need the spline-to-hex tool, or fabricate something with an old driveshaft spline.
    Oh thats actually good news because I have done that before an has the tools for it.....I had an old 440 once I changed the impeller on, man that thing was stuck tight!!!

  7. #7
    PWCToday Newbie Brandon577's Avatar
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    Re: Pump rebuild, is it difficult?

    Yabadabadoo its a fairly easy job, like OldGuy says getting the impeller off is the hardest part! I usually use a flat head screw driver to remove the seals and a hammer and socket to remover the bearing. Use a socket that only hits the outside rim of the new bearing when installing and tap lightly till it seats. Install seals the same way making sure they go in the same direction old ones came out. Reinstall impeller (there may be a torque setting) and pack the end of the pump shaft with grease before reinstalling the jet pump cone!

    I have never tried freezing bearings and heating up the pump but I'm definitely trying that method next time I rebuild a pump!

  8. #8
    PWCToday.com Is My Home Away From Home
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    Re: Pump rebuild, is it difficult?

    Quote Originally Posted by Yabadabadoo View Post
    Oh thats actually good news because I have done that before an has the tools for it.....I had an old 440 once I changed the impeller on, man that thing was stuck tight!!!
    A 440 impeller will not come off without significant amounts of swearing, blood, and alcohol.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

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  9. #9
    PWCToday Regular
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    Re: Pump rebuild, is it difficult?

    Quote Originally Posted by Brandon577 View Post
    Yabadabadoo its a fairly easy job, like OldGuy says getting the impeller off is the hardest part! I usually use a flat head screw driver to remove the seals and a hammer and socket to remover the bearing. Use a socket that only hits the outside rim of the new bearing when installing and tap lightly till it seats. Install seals the same way making sure they go in the same direction old ones came out. Reinstall impeller (there may be a torque setting) and pack the end of the pump shaft with grease before reinstalling the jet pump cone!

    I have never tried freezing bearings and heating up the pump but I'm definitely trying that method next time I rebuild a pump!
    It sounds very similar to wheel bearing on a motorbike so it should be no prob, thanks for the input guys.
    My teacher at heavy duty mechanic college taught us the freezing bearing trick, it's awesome! heat expands metal, cold shrinks metal so you heat up the part the bearing is going into, then get the bearing you had in the freezer overnight or a couple hours and it drops right in...barely even have to tap it in...Great trick!!

  10. #10
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    Re: Pump rebuild, is it difficult?

    Quote Originally Posted by linkman View Post
    A 440 impeller will not come off without significant amounts of swearing, blood, and alcohol.
    100% true!!! took about a week of all of the above to work!!! lol

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