GTS cavitation?

[Gwstaudy]

I’m not completely sure what’s wrong with it once again but I’m back on here. I got it on the water again and last time I had it out it would plow water and I’d accelerate and it sounded like it would rev up but not go any faster. I took it out and replaced the wear ring and put in a solas impeller and rebuilt the rest of the pump. Now that it’s back out it definitely gets up faster and I think it gets on plane but if I give it any more throttle it goes no faster. When putting the wear ring in there’s no gap on the bottom of the pump but there is a visible gap on top. Could it be a junk wear ring or something else. It seems like it tops out and I can feel the ski like shake a bit and it like sputters kind of. Not the engine but the water it sounds like.

Additional detail is that I am currently breaking in the engine.
I’m also adding a picture of the gap from impeller and wear ring.

 

[Gwstaudy]

My pump housing seems to be fine besides for there being some marks and chewed up bits on the fins that are right behind the impeller. Could that be enough to cause this issue or is it wear ring related? Do I need a new pump housing?

 

[burtshaver2021]

It’s very hard to tell from the picture as the picture gets blurry when it’s expanded but it may look like too much clearance from the prop to the wear ring. Can you get some feeler gauges in there to measure? Without looking at the manual I think maximum clearance is 1 mm? Did you check the manual? Do you remember what the clearance is supposed to be? I wouldn’t ride anymore till you get it figured out, it may not be cooling properly if the clearance is too much. Did you happen to see if a good stream was coming from the pisser?

 

[Gwstaudy]

It’s very hard to tell from the picture as the picture gets blurry when it’s expanded but it may look like too much clearance from the prop to the wear ring. Can you get some feeler gauges in there to measure? Without looking at the manual I think maximum clearance is 1 mm? Did you check the manual? Do you remember what the clearance is supposed to be? I wouldn’t ride anymore till you get it figured out, it may not be cooling properly if the clearance is too much. Did you happen to see if a good stream was coming from the pisser?

I don’t believe this one has a pisser unless I’m unaware. I’d bet that gap is more like 2mm from what I can see. It did run good and always started first crank on the water. In the pic the light you can see is from a work light I put behind it and I can only see it at top and bottom but it seems to be a pretty large gap.

 

[mikidymac]

The gap should be the same around the entire circumference.

 

[Gwstaudy]

The gap should be the same around the entire circumference.

It’s definitely different. Sides are tight and the top and bottom have a visible gap. Could that be causing the whole issue or is the pump housing part of the problem too?

 

[mikidymac]

Then either the pump is distorted or the wear ring is.

 

[Gwstaudy]

Then either the pump is distorted or the wear ring is.

I froze the wear ring and it slid right in. It is a cheap one. I could buy one off OSD instead.

 

[mikidymac]

I know some people have good luck with the aftermarket ones however I have never had an issue with OEM so that is what I use.

 

[Gwstaudy]

I know some people have good luck with the aftermarket ones however I have never had an issue with OEM so that is what I use.

Where do you buy oem ones. I’ve seen some but only for $50+. And is there an easy way to figure out which is distorted? Neither appeared to be when I had them out.

 

[burtshaver2021]

I don’t believe this one has a pisser unless I’m unaware. I’d bet that gap is more like 2mm from what I can see. It did run good and always started first crank on the water. In the pic the light you can see is from a work light I put behind it and I can only see it at top and bottom but it seems to be a pretty large gap.

I’m not sure what model you have but I’m pretty sure they all have pissers, that seems like a very large gap, I’ve read ahead and see you have it under control, I couldn’t imagine it being the pump housing itself. Anything OSD or Seadoo warehouse sells is going to work. I see many people using Delrin wear ring. I haven’t had the pleasure/need to change one myself yet.

 

[Grim]

Measure the wear ring as it sits. When you take the wear ring out do some measurements on the housing, that will verify whether the warp is in the housing or the wear ring. Also pay close attention when removing to make sure you didn't get anything between the two.