Thread: Laser engine alignment
04-12-2014, 03:32 AM #1
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.
04-12-2014, 05:57 AM #2
- Join Date
- May 2007
- Auckland, New Zealand, New Zealand
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.
04-12-2014, 08:58 AM #3
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.
04-12-2014, 09:02 AM #4
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?
04-12-2014, 09:52 PM #5
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!
04-13-2014, 01:11 AM #6
04-13-2014, 08:11 AM #7
This is a good idea for aligning the motor,BUT how are you going to know if your pump shoe is off or not????
04-13-2014, 01:42 PM #8
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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