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  1. #1
    brendanm's Avatar
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    Laser engine alignment

    Thought Id share how I aligned my motor today. Seadoo wanted $100 to do it, bit weren't able to do it for a week or so, so I ordered a laser pointer ($12 express posted). Wrapped tape around the rear of it so it fit tight into the splines, and also further up so it was a tight fit in the PTO seal. Clamped a piece of clear plastic bag over the through hull to show where the beam would go through.

    Turned the engine over via the supercharger (plugs out) and made sure the beam didn't vary (eg it was properly centered). Put my prop tool (short) into my prop in the pump (as a reference point) and installed the pump with a couple of nuts.

    I could then align the engine, making sure that the beam was centered though the middle of the through hull, and centered on the prop tool (by looking through the intake grate). Took probably 45min all up dicking around.

    Ended up pretty much perfect, with 1/2 inch float in the driveshaft.
    These pics are while it was getting aligned, not the end alignment so don't worry.
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  2. #2
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Not a bad idea. Provided you gave the laser at least 2 reference points in the horizontal, which it looks like you have with the film over the through hull hole and then the prop tool and it didn't deviate from either point while rotating the engine, I think you'd be spot on. Nice "outside the square" thinking.

  3. #3
    JT jpt7779's Avatar
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    Great thinking, but the one thing it can not do is set the longitudinal axis (fore and aft). This is the culprit of poor tension on the floating ring / carbon ring and bellows.

    Once the fore / aft has been set, using your laser light idea is perfect.

  4. #4
    brendanm's Avatar
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    Sorry I should have clarified what I meant when I said shaft float, I meant fore aft movement, set it at 1/2 inch which I think is right?

  5. #5
    JT jpt7779's Avatar
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    You may find 1/2" is too loose, if you get any cavitation set it closer to 3/8"-1/4".

    again, good thankin son!

  6. #6
    brendanm's Avatar
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    Quote Originally Posted by jpt7779 View Post
    You may find 1/2" is too loose, if you get any cavitation set it closer to 3/8"-1/4".

    again, good thankin son!
    Thanks mate, just slid it back a bit and realigned, got 3/8 now. Easier to do it now while I'm still waiting for the driveshaft than when its all back together!

  7. #7
    Moderator Snoman's Avatar
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    This is a good idea for aligning the motor,BUT how are you going to know if your pump shoe is off or not????

  8. #8
    brendanm's Avatar
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    Pump shoe is off very slightly, can see it when I put the driveshaft in to check driveshaft float. Its off to the right by 1mm or so, probably slightly less. All good up/down.

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