Jet Pump Area Hull Repair Help!!!

[gerrito]

I bought a Sea Doo Xp 1996. It had the hull damaged where the mounting studs go. So i went and removed all the old fiberglass and got it with some new fiberglass. Only have 1 problem, i see the jet pump is not getting straight in the hull. If any one can give me some advice will be appreciated. I already had it sand down, only need to get the jet pump straight to get some gel coat and mount everything back. Thanks!!!

 

[Sportster-2001-951C-Stock]

I think you need to use the engine alignment fixture in order to confirm it's right.

 

[Waterluvr]

I think you need to use the engine alignment fixture in order to confirm it's right.

Correct, you use OEM PN#272000053 or a stainless equivalent to shim the alignment plate as needed to get everything fine tuned once the engine is in the sweet spot and the pump then goes back on using the shims in the same location for minor adjustments.

Gerrito may need to do some glass work and build one side back out before that's going to align properly, it looks to far out in the pics for getting it right with the engine mounts and pump shims, the alignment plate will show you what you need to do to get that right.

 

[Coastiejoe]

If I am reading this right,,, your issue isn't the engine being aligned, but the pump being on an angle due to the repair. Yes?

If so, you will either have to sand the hull where you repaired it, or, sand the mounting area of the pump so that one side is thinner.

 

[gerrito]

Exactly my problem is the angle the pump fits. My fear is to get where there's no more fiberglass and then need to fiberglass again. Also the shaft not entering completely in the impeller.

 

[Coastiejoe]

I think you will have to remove material from the mounting ears of the pump to allow a square fit and allow the pump to slide into the shaft further.


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[gerrito]

Good idea. Its better to get some plastic off than fiberglass. The fiberglass itches to much jajajaja. Will be posting the results when i decide what to do.

 

[Sportster-2001-951C-Stock]

Yep, that's a better approach as opposed to using a shaft stretcher. There are rubber buttons that go in the hole at both ends of the shaft FWIW, and in case you weren't aware.

I always thought the purpose of confirming engine alignment was to make it align with the pump, maybe I got it backwards?

 

[Luv2Camp]

On a side note, you on the mainland? My father in law lives on Culebra

 

[Mekanix]

Yep, that's a better approach as opposed to using a shaft stretcher. There are rubber buttons that go in the hole at both ends of the shaft FWIW, and in case you weren't aware.

I always thought the purpose of confirming engine alignment was to make it align with the pump, maybe I got it backwards?

In theory the pump and hull should be perfectly square from manufacture right ? Not always, but assuming that it is would mean the engine is the thing that has to move to compensate.

I think some of the racers were complaining about the pump not being perfectly square and having to compensate with the nozzle to go straight which caused a loss in speed.

 

[Sportster-2001-951C-Stock]

Yeah, the crankshaft and impeller shaft need to be parallel and have the same annular centering for maximum torque transfer under load. The impeller of course will try to cock sideways as torque is applied and small offsets will make a noticeable performance difference to racers perhaps due to loss of torque delivered to the impeller at an angle, accelerated spline wear is my primary concern but that goes hand in hand with transferring torque.

Might be able to tilt the pump slightly to reduce steering nozzle losses but then alignment losses appear? Perhaps racers could modify the pump tunnel shape (larger on one side than the other or angled to the keel?) to make the water flow more laminar thus allow a neutralized steering nozzle? I can't say I've seen anyone do this kind of mod but might help?

 

[gerrito]

On a side note, you on the mainland? My father in law lives on Culebra

Yes iam in the mainland. Guayanilla PR 00656

 

[Luv2Camp]

Have not been that far south on the mainland. My father in law also has a place on Humacao which I think is not that far from Guayanilla?? We were hoping to get down there this year but airfare from Ohio is a killer right now!

Hope you get the pump issue squared away (no pun intended)

 

[gerrito]

Thanks.. Will be working the project on Monday.