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  1. #1
    785xp's Avatar
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    1996 XP Drive shaft

    Down at Norris, I discovered that the rubber plug on the drive shaft on the engine side had been damaged, probably due to lack of grease. I replaced it and went riding for four or five hours with no problem.

    When I go home, I took off the stock pump that I use when I go to Norris and put back on my RFI pump. When I went to get riding, I got a bunch of cavitation, so I came to the conclusion that the rubber plug on the drive shaft on the pump end must have come off when I was installing the pump. I rode for a while jumping some large waves dealing with intermittent cavitation. When I got home I discovered I was right. It was not on the driveshaft, but in the impellor hub. I also took out the drive shaft and found the plug on the engine side was damaged. It is all back together properly now.

    My question is, if the rubber plug is missing on the impellor side, does the drive shaft move around and cause the cavitation or do I have other potential issues?

    I don't live close to the lake, so I want to get this thing right before I hit the water.


  2. #2
    JayZ's Avatar
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    mike, the missing rubber stopper on the pto end of the driveshaft will cause cavitation since it allows the driveshaft (and seal) to move away from the carbon ring.

    on the other end, if the rubber stopper was in the impeller hub, then it just came out of the driveshaft when you disassembled it.

    i can't imagine a missing rubber stopper on the impeller side will cause cavitation. the drive shaft might move around a bit more, but shouldn't cause any issues in my opinion.

  3. #3
    785xp's Avatar
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    That is why I am asking. The rubber plug that we installed in Norris on the PTO side was damaged after I took it apart after a 30 minute ride at Port Stanley after installing the RFI pump. When I took the pump off, the other rubber plug was inside the impeller hub. I assumed the drive shaft moving around damaged it on the other end.

    It worked fine in Norris for 5 hours of riding after I installed it.

    Do I have a bigger issue in my driveline? I am pretty sure we checked the driveshaft to make sure it was straight.

  4. #4
    Tool Bag water worx's Avatar
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    Everything normal,overevaluating.

  5. #5
    785xp's Avatar
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    So did the rubber boot on the drive shaft on the engine side get damaged due to the rubber boot not being installed properly on the pump side?

  6. #6
    785xp's Avatar
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    FYI, if you don't have the rubber plugs inserted on both ends of the driveshaft, you will have cavitation.

  7. #7
    785xp's Avatar
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    I still have intermittent cavitation going on. I installed a new neoprene seal before I went to Norris.

    Since my driveshaft was moving all over the place and I had no grease in the PTO, could I have damaged my carbon seal. I don't seem to be leaking water, but could a faulty carbon seal be causing my caviation? Can I visually tell if my carbon seal needs replacing?

  8. #8
    Master of the Dooniverse
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    leaky seal doens't cause cavitation Mike, it causes ventilation. the two are very different. one is a leak and the other is the boiling of water due to localized low pressure regions before the prop. just trying to clarify.

    I have ran with crap bumpers in the shaft and not had an issue....is it possible you have some other issue? there's no real reaosn for the drivehsaft ot move forward or back, it'll find one spot and sort of rest there. i can't see the bumper in the prop missing being any trouble except that as JayZ said it wcould allow the pto on to shift out of the shaft and then "maybe" you could ventilate, but if the thing falls out fo the shaft end in the pto, then it will sit in there and actually take up more room. the thinnest section of its profile is seen when it's positioned in the shaft.

  9. #9
    785xp's Avatar
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    I know that when I give it gas, the engine revs, but I don't go anywhere. I have to let off the throttle and play with it before I get going. Is there a chance my PTO is stripped?

  10. #10
    Tool Bag water worx's Avatar
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    Quote Originally Posted by 785xp View Post
    I know that when I give it gas, the engine revs, but I don't go anywhere. I have to let off the throttle and play with it before I get going. Is there a chance my PTO is stripped?
    Once the splines are stripped they dont just hook up & go again.

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