kosemoseoverdose

A friend of mine revently bought a 2nd hand Challenger as a part exchange for a snowmobile.

When we took it for a "spin" today it didn't accelerate as we expected. After running for a while it suddenly stopped delivering the power from the engine to the waterjet. The engine revved to 7-8000 rpm's, but the craft mooved at approx. 15 mph. As soon as we reached 15 mph the jet stopped accelerating, and just hit the revlimit. We had a look at the impeller, and the inner edge is totally worn out. We don't think this has the full blame for this problem.

Anyway... we started dismantling the jet, and came in to the drive-shaft. We want to remove the drive-shaft to check the bearings and seels. Any good how-to's on this topic, or any idea what is wrong?


Thanks for any help.

Cheers from 3 blokes from Norway (Where the boat-season is too short for us to be having problems).

oldandtired

Sounds like you spun the splines on the driveshaft.

Rene

Noise Pollution

Try jetboating.net. Its a great site for jet boats.

Big Block Billy

How about getting a boat and not a toy...

sleeper_dave

We had one of those. Those jet pumps are a pain in the ass, but you can buy every part in it including the liner for the housing seperately and it's not too outrageous.

When you say driveshaft, are you referring to the shaft through the hull of the boat or the shaft in the jet pump?

To get the jet pump apart you remove it from the boat, take off the rear nosecone, and grip the flat spot of the shaft (step shaft) in a vise. Then insert a special tool in the splines of the impeller and rotate it off the shaft. From there it's self explanatory.

gsmith9898

I bet its the jet impeller. Take it to a seadoo place. Mine cost me about $900

sleeper_dave

you overpaid.

I burnt one up so bad that there was no longer a step on the step shaft. Only things that weren't bad were the impeller and the actual housing, and the housing did have some damage. Parts were like $350, the impeller would have been another $150-$200.

The first place I went for parts would only sell us a whole housing for $900ish. Then I went to a jet ski place and got just what I needed for a lot less money. So shop around.

kosemoseoverdose

We changed the impeller, it was severely damaged in the casing. However now it won't start. We have enough electricity on the battery, but the starter just doesn't seem to have enough power to turn the enigne one hole revolution.....

sleeper_dave

Does the impeller spin freely in the housing?

I hate to suggest something so simple but it's the only thing i could think of that would drag the motor down, unless there's some type of internal problem with the motor.

Chris288

Sounds like it was cavitating, blowing out, common problem with getting weeds or a stick stuck on the leading edge of the impeller. In your case it sounds like the impeller iteself is damaged, should be fine now that you changed it. as far as not having enough power to turn it over,, you could have fried your starter, they are easily rebuildable by a starter/alternator shop, usually around 50.00...