'06 GTi 130 no power out of the hole

[AZ Xtreme]

So heres the problem i am having. Went to lake on saturday, idled through the no wake zone just fine.. passed the boueys and laid into the throttle. NO GO. Revved very high, and nothing. Crap back to the shore.. checked intake, wear ring, jet pump (new), impeller also new. turned around and went back out. same thing.. this time i eased into the throttle same thing but not as bad.. eventually as if there was a clutch it engaged and started to pick up speed.. tried the same thing again. Same thing happened. now i know there isnt a clutch, but what could be causing this?

As i said its a new jet pump,wear ring, impeller, bearings..

 

[Coastiejoe]

It is either the Carbon Seal allowing air into the impeller or the drive shaft splines are bad.


Repairing and selling iPads, iPhones and Mini iPads.

 

[brobertov8]

I would say the same as CostieJoe… Maybe your carbon seal is bad or bad assembled (no C-Clip or there is not correct pressure on it by the boot)

 

[AZ Xtreme]

Is that easy to get to?
And what would cause it to go bad?

 

[brobertov8]

Is that easy to get to?
And what would cause it to go bad?

The Carbon Seal is located on the shaft, on the bottom of the hull:






You can see a black rubber (boot), the carbon seal attached to it and the "collar" which is pressed into the carbon seal by the boot (like a coil).

Check if it is mounted correct. I would suggest you download the service manual for your model, there are measures there to check.

 

[AZ Xtreme]

Thank you pictures go a long way for help
thanks

 

[AZ Xtreme]

Im at the right place here right? And should this wiggle or be tight to the shaft?


the band my finger is on if i push down it moves, wobbles around.. not sure how much

 

[brobertov8]

Im at the right place here right? And should this wiggle or be tight to the shaft?
View attachment 26576View attachment 26577

the band my finger is on if i push down it moves, wobbles around.. not sure how much

Correct! The carbon seal is right under your finger.
No problem if it moves a bit, it is not so tight to the shaft.

Lift the other rubber (a semi-cover) and you will see the colar (stainless steel peace) next to the carbon seal. It should be pressed against the carbon seal with a good pressure.

 

[AZ Xtreme]

thats what it looks like.. looks good to me but IDK

 

[brobertov8]

View attachment 26581View attachment 26582

thats what it looks like.. looks good to me but IDK

Really does not look bad.
Let´s see if someone says something different, but I can´t see wear there.

Did you check if there is good pressure from the boot to the collar?

 

[AZ Xtreme]

Really does not look bad.
Let´s see if someone says something different, but I can´t see wear there.

Did you check if there is good pressure from the boot to the collar?

Yeah i tried to push back on it doesn't move easily

 

[brobertov8]

Yeah i tried to push back on it doesn't move easily

There is a recent thread (this month) where a user describes how carbon seal works. There he says which a carbon seal can go bad even when looks good.

But honestly, after you pics and what you related, I really dont believe the carbon seal is the main reason of your huge "cavitation".

Did you check the wear ring again? Maybe access to it below the pwc, revoming theat intake protection and inspecting it. Chheck the clearance, no more than 0.40mm in the middle of each blade...

 

[Coastiejoe]

You either have cavitation or, something is slipping. The drive shafts fail more often than they should. Under a load the engine revs right up but the impeller prevents the shaft from turning until it slowly catches up, much like a clutch.

 

[AZ Xtreme]

Should I pull the shaft and check? Was also thinking of swapping the jet-pump with the other ski, and testing again. would that be a waste of time?

 

[Coastiejoe]

is the gap less than a dime from the wear ring to the impeller?

 

[AZ Xtreme]

is the gap less than a dime from the wear ring to the impeller?

yes it is very close. minimal distance

 

[Coastiejoe]

I would do one thing first,, Take it to the ramp, make it a concrete ramp with no stones under the ski, back down the ramp, remove the seat, fire it up. Give it a little rev and see if the shaft spins in direct relationship to the drive shaft.

 

[AZ Xtreme]

I would do one thing first,, Take it to the ramp, make it a concrete ramp with no stones under the ski, back down the ramp, remove the seat, fire it up. Give it a little rev and see if the shaft spins in direct relationship to the drive shaft.

I think im missing something here.. I know it spins cause i can idle through the no wake zone..

 

[brobertov8]

I think im missing something here.. I know it spins cause i can idle through the no wake zone..

Could you measure the clearance on each blades?? Less than 0.40mm?
Anything bigger than that and you will get cavitation.

My wear ring was toasted... several risks... and one of them was bigger than 0.40... result: Cavitation

 

[AZ Xtreme]

I forgot to get back to this matter after we figured out the problem which was a small crack just past the intake grate, on one side of the ride boot? I think thats what it is called, just before the ride plate. Added some epoxy, sanded smooth, added more epoxy, and sanded again. lake tested, and boom works great again...