Water in the Jet Pump

[kctt1152]

I've got a 95 Seadoo GTX. For the second time this summer, I popped off the cone on the jet pump and watched an oil/water mix run out.

First...is there something I can use to make sure all the water gets out?

Regarding the water. I found tonight that the threads which the top plug on the cone (allen head) are pretty torn up. The fill screw still seems tight but I would almost best it leaks. I've used locktight in the past but I don't know how effective that would be. Could I use teflon tape? the "o" ring appears to be in good condition.

Could this be where the water is coming from? or do you think it is coming from somewhere else. (one other thing...appeared to be old oil on the cone also their was oil in the allen hole of the cone screw/plug.

I've been told by three different techs three different ways to prep the large o ring. One said to use blue locktight, one said locktight 518, and one said only to use a little oil on the o ring so it slips on easier.

Parts for a 95 are getting tough to find so any suggestions would be sincerely appreciated.

thanks
Terry T in KC

[SC93SPI]

Re: Water in the Jet Pump

I just changed the oil in the jet pump on my 93 SPi (I used 75W-90). I am a new skiier, and this was the first time that I did this job. I looked at two sources for information on how to do this. One was Google video (Changing pump oil in vintage Seadoo). They used 75W-140 on the O-ring and mating surface of the cone and then just replaced the cone.

The second place I looked was a web site called:

http://www.seadoosource.com/oilrep.html

On this site they used Loctite 518 to the O-ring and the cone mating surface before re-installing. They used blue thread locking compoung on the bolts for the oil cone. They used anti-seize on the fill plug on aluminum / bronze cones.

Once again, I am new at this. Use this info as you will.

[smokestack]

Re: Water in the Jet Pump

terry, the front seal of the pump is leaking during accleration thats the only way
water gets in the cone, a bad plug is pushing oil out due to high water pressure in via front bad seal , hope this helps a bit

[brumor]

Re: Water in the Jet Pump

One thing to check before you assume water is getting into the cone: Most cones have an outer jacket that can fill up with water without getting any water inside the cone. It doesn't drain until you pull the cone to drain the oil and then it looks like you've got water mixed in with the oil. I guess some of the newer cones have weep holes drilled into them to drain this outer water, but older ones do not. The way to tell is by looking at the oil and water when you drain it. If the oil is dark and shiny and the water seems clear and separated from the oil, then the water was most likely just in the outer jacket. But if the oil is grey and cloudy and you don't see much separated water, then you've got a problem.
There are 3 places where water can get into the pump bearings: cone seal, cone pipe plug, and the shaft seal that is on the other side of the bearing housing. As long as you have a cone that is in decent condition, use a new O-ring with the proper sealant, and get the plug screwed in properly, then the most likely source of the leak would be a worn shaft seal. SeaDoo recommends Loctite 518 for the O-ring and Loctitie 567 for the pipe plug on my 2000 GTX. A pressure test (10psi for 10 minutes) is necessary after replacing the cone seal. This tests the cone seal and shaft seal for leaks. If you have a small compressor, you can make your own tester with a 0-20psi gauge, valves and tubing for less than $20. The thread on my cone plug was standard 1/8"-27 NPT. This tester is also handy for testing gas and oil tanks for leaks. Replacing the shaft seal (and possibly the bearings and shaft) can be a little more tricky. I sent my pump to Bill ONeil at Watercraft Magic who did a great job rebuilding it for a fair price.