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97 challenger no thrust??

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Badboyr6

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Hey guys, I have a 97 single engine challenger. I just installed the motor today and I put it in the water but when I give it throttle it barely moves. We pulled the boat out of the water and there was nothing stuck inside the grate. My impellor looks ok very few nicks if any. My buddy decided to try it and by working the throttle finding a sweet sport where the boat would actually start moving forward he worked it until the boat got on plane. What could my problem be? Wear ring? Impellor? Pump shoe? Thanks
 
Hey BB

Iirc check your carbon ring may be cause of no thrust.
If it's caveating that engine revs WR will be culprit or combo of two.
Any water leaking into compartment??

Dr Honda said:
Yes... It sounds like cavitation. But... it sounds more like a wear ring, or impeller. Normally with a carbon seal, you don't go anywhere until you throttle back a little to get it to seal up.

But... honistly... if you have bad cavitation... change both.
Click to expand...


Here's is a good thread

http://seadooforum.com/showthread.php?t=33767&highlight=Carbon+ring
 
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Yes when the boat is just sitting in the water it starts to leak from the carbon ring. But when it's on then it doesn't leak a lot of water. The gap in the wear ring is small, you can't slide a credit card through it.
 
Start with that??
Or ride shoe.
You def have a air leak somewhere.
Tried to find more on it for you but couldn't.
Sorry.

You heading out tomorrow??
 
I wish I could but I have a paper due for one of my classes on Monday so I have to finish it up tomorrow. Thanks for the website. Looks like I might just have to start with the carbon ring and plate. A little pricey just for. Carbon ring... Wow
 
Start with a new wear ring and neoprene seal for 60 bucks. If you havent changed it, you probably need it anyway. If that doesnt do it, its prolly the carbon seal.
 
i took the pump off, and it was actually atv silicone to the boat, really weird, there was no neoprene seal. I then was able to take the drive shaft out. I took the carbon ring off and it looked like its been worn kinda lopsided, and it had some swirl burn marks in it. So i took a flashlight to it, and when its up against the metal plate, you can see light escape from the sides.

When i took the new carbon ring and the cleaned up plate, i cant see light escape on the sides, so i'll see if I install that and the new neoprene seal and see if that fixes my cavitation problem.

the wear ring looked ok, and the impellor looked ok too. Im thinking of changing the oil that is in the cap by the impellor, what kind of oil would i use for that? thanks
 
Badboyr6 said:
i took the pump off, and it was actually atv silicone to the boat, really weird, there was no neoprene seal. I then was able to take the drive shaft out. I took the carbon ring off and it looked like its been worn kinda lopsided, and it had some swirl burn marks in it. So i took a flashlight to it, and when its up against the metal plate, you can see light escape from the sides.

When i took the new carbon ring and the cleaned up plate, i cant see light escape on the sides, so i'll see if I install that and the new neoprene seal and see if that fixes my cavitation problem.

the wear ring looked ok, and the impellor looked ok too. Im thinking of changing the oil that is in the cap by the impellor, what kind of oil would i use for that? thanks
Click to expand...




here you go

kustomkarl said:
Here is some info on the Jet pump oil change;


The pump oil change

If you look into the nozzle in the rear of the ski you will see a cone with 3 screws and an oil filler allen screw.

To change it,
1) Take off 4 13 MM bolts holding nozzle and 10 MM bolt holding steering.

2) Get something to catch the old oil in, drain pan or margarine cup etc.... (don’t forget the nose plugs, the oil stinks to high heaven)

3) Remove the 3 8 mm bolts holding the cone on.

4) Pull the cone and drain the oil out. Prop the front of the trailer up as high as you can to get most of it out.

5) Inspect the rubber “o” ring and if it is good apply silicon and reinstall the cone. Make sure the allen fill plug is on top.

6) Lower the front of the ski and add oil** to the cone. When it is full, take a brake and have a drink. There is air in the cone and when you go back you will see that it is low. Top it off and take another brake... do this until the fluid does not lower again. I often start the ski for a few seconds to make sure oil is all the way worked into the bearings and all the air is out.

7) Wipe silicon on the set screw and screw it in (be sure not to run it all the way into the cone. just deeper than flush is fine. Let it sit 24 hours to cure the silicon and put the nozzle back on.

**NOTE: Use Sea Doo 75w90 GL5 Synthetic Polyester Oil, or similar same wt.
I hope this helps

Karl
Click to expand...
 
If it was sealed on with RTV, that means the last redneck mechanic did it that way. You are better off cleaning it up and using a new neoprene seal. There is a reason it came from the factory that way.
 
That's what I was thinking of doing. As soon as I get home I'll clean it up and install the new carbon ring and put the new neoprene seal in it's place. Which side does the adhesive attach to? The boat or the actual jetpump? I'm going to change the oil in the jetpump while I have it off also.
 
I am not sure. I have only had mine apart, and in 98 they didnt use a neoprene seal. You have to glue it on.

I would think it wouldnt really matter. It is going to seal either way. It is probably there just to aid you in holding it on to get it back together. If it was me, I would stick it to the hull with the adhesive. One of the pros who have done it should answer.
 
Don't use atv or silicon, just buy the seal, it's cheap and a lot less work when you need to pull the pump off next time, and you will.. :)
 
I put the sticky side towards the boat, but I have a problem i took the boat out after I installed the carbon ring and the new seal. But the actually plastic connector on the jet pump broke off( the main water cooling hose) that comes from the jet to the motor, and I overheated the motor a bit and the buzzer came on, I shut the motor off and let it cool down a little bit. I came home and ran the boat on the hose, it ran ok and then I checked compression 155, 155 so I didn't blow the motor. But my question is, how do I change that plastic little pipe that comes from the jet it looks like it's glued into the jetpump...
 
I forgot to mention that looks like the carbon ring was at fault here, because the boat did get on plane as soon as I took off.
 
thats exactly the part, i dont know how it broke off, i went to throttle up on the boat and the boat got on plane, then all of a sudden the beeper went off, and it shut off. I restarted and the motor barely wanted to run, so i pop open the engine bay and water is rising like crazy. So i pumped all the water out, and i look for the hole, and the hose with the plastic piece was completely busted off. I tried to shove it back in the hole, but it wouldnt stay. Thanks for the diagram, im going to see if i can buy that piece asap.

im not sure how im going to get it out of the pump, but maybe i'll have to drill it out. if anyone has any other ideas, please feel free to let me know.
 
See, aren't you glad you didn't use sealant!!..LOL...

Just take the pump off and use some needle nose plyers or stick a large screw driver in the hole and unscrew it...
 
rofl...man, i wouldn't put sealant there in the first place, LOL. i wonder how this guy even drove the boat like that from the beginning with the sealant and carbon ring. I'll try taking the jetpump off again today and seeing if i can get that piece out. I'll post pics, and let you guys know how i do. :)
 
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