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  1. #1
    miagp21's Avatar
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    Drive shaft front to back play / slack? How much play is adequate ?

    Hi guys, my 16' RXP X 300 has over an inch of front to back drive shaft play (moving between engine and impeller). It's been a problem.. I finally discovered this and figure over 1" of slack is too much, but then how much slack is acceptable? I purchased the shop service manual for this jet ski and it doesn't say anything about it.

  2. #2
    tiderider's Avatar
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    Maximum 3/16 of an inch.

  3. #3
    1/4”-3/8” is what I’ve always seen. I run mine at 1/4” and have zero issues and splines always look perfect.

  4. #4
    EVN81's Avatar
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    Shop manual refers only to marks on the alignment bar. If calculated back itís indeed 1/4Ē to 3/8Ē
    1Ē is a lot, I guess there was hardly any spring pressure on the bellow holding the carbon seal?


  5. #5
    miagp21's Avatar
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    Quote Originally Posted by EVN81 View Post
    Shop manual refers only to marks on the alignment bar. If calculated back it’s indeed 1/4” to 3/8”
    1” is a lot, I guess there was hardly any spring pressure on the bellow holding the carbon seal?
    Yeah, it started taking water
    So is the play adjusted only on the engine side? Moving engine back and forth, or is there any adjustment on the pump side somehow?

  6. #6
    EVN81's Avatar
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    Engine side only.

    Itís best to get your hands on an alignment set and make a proper job now youíre there anyway.
    Set axial play without bellow/carbon seal/hat.
    But with rubber driveshaft cap (engine side) and jet pump installed.

  7. #7
    miagp21's Avatar
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    Quote Originally Posted by EVN81 View Post
    Engine side only.

    It’s best to get your hands on an alignment set and make a proper job now you’re there anyway.
    Set axial play without bellow/carbon seal/hat.
    But with rubber driveshaft cap (engine side) and jet pump installed.
    yeah I have the SBT alignment tool. I aligned it side to side and up and down, didn’t think of front to back alignment !

  8. #8
    njallday18's Avatar
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    +1 for 1/4. Haven't had an issue

  9. #9
    miagp21's Avatar
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    So, adjusted front to back alignment, everything new and aligned, went to test and it takes in water again.. Turns out, the whole engine is what’s moving, under throttle the engine moves forward, causing the carbon seal to separate. It has to be the motor mounts. I’ll swap and try again

  10. #10

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    Quote Originally Posted by miagp21 View Post
    So, adjusted front to back alignment, everything new and aligned, went to test and it takes in water again.. Turns out, the whole engine is whatís moving, under throttle the engine moves forward, causing the carbon seal to separate. It has to be the motor mounts. Iíll swap and try again
    Some water is acceptable when going fast. It can t be 100% sealed....

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