08-21-2005, 10:20 AM #1
anyone who is running a SS wear ring
for all you guys running a ss wear ring this might be some good info, i didnt post it but i have been having problems with the ss wear ring because the impeller is contacting it under heavy load, my friend with a stock rxp no mods at all does not have this problem at all, after talkin with gp at ppg we have found that in the modified boats(meaning more than a air intake) there is a problem with shaft deflection, if you look at jerrys ring on the website you see no burn marks at all, this is because glen has modified his pump by moving the bearing forward 5mm, for anyone running a stage 2 kit i would highly recommend getting your pump machined to move this bearing forward or do teh double bearing mod, i waited too long and now i have trashed 2 wearings, 2 impellers, and a pump housing, there should be no burn marks on the impeller at all, maybe just a small light mark or 2 but thats it, this all happened under normal conditions, in a lake, nothing has been throught the pump, it is just prop shaft deflection due to the increased power,
i just thought i would let everyone know so they dont have to spend the kind of money i have to to get the pump bulletproofed, i didnt ask ppg how much the machining is but i believe it is fairly cheap, ill post pics in a couple of days
08-21-2005, 10:54 AM #2
Yea, PPG's pump mod has held up great for me so far. 35+ hours on it and the stainless wear ring and all is fine.
08-22-2005, 08:26 AM #3
Seadoo02xp: What made you first determine this? Were there any early signs? (performance/cavitation?) I run the ss ring, but not the double-bearing or the 5mm. I am concerned though, starting to see a little scarring. How long (hrs) did you run the before the mod? Or Jer -if you might know?
08-22-2005, 10:36 AM #4
This has been a possible problem with the SS wear rings that I had been mentioning all along. Besides shaft flex, the impeller blades can also flex under high horsepower load causing the prop to contact the wear ring. It has a lot to do with the clearance between the prop blades and SS wear ring. Some pumps have more or less clearance due to manufacturing tolerences. Impellers are also sized differently...often one blade will be a few thousands longer than the others. As the bearings wear and develope even the slightest wobble this is going to be an increasing problem. When all is fine the SS ring is great, but the one day it is going to cause an expensive repair.
08-22-2005, 10:52 AM #5
Guys: Which is the easier mod? Going to the double-bearing or machining the pump to move the bearings? The less downtime the better.
08-22-2005, 11:15 AM #6
I think PPG can do the mod quicker. It's proven to work very well for me.
08-22-2005, 11:28 AM #7
I will be calling Glen asap - thx
08-22-2005, 11:32 AM #8
Good deal, tell him i said hello. Been a while since i've spoken with him.
08-22-2005, 11:41 AM #9
08-22-2005, 11:44 AM #10
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