First pwc and having a nightmare Please Help

[hulmey]

OK This is my first pwc and its been nothing but trouble and only been out twice for no longer than 10 minuets
Firstly it had a host of sensors down all have now been replaced and shows no fault codes. Here is what happened took it to the local lake on Sunday and had a blast for ten or so minuets, Went into the bank side to collect my kids I tried to get off to assist them in mounting but all the weight on one side tipped it over on its left side (if you were sitting on the craft) once back on its hull and restarted it had sucked up a few pebbles from the bottom of the lake. I took it out of the water and removed said pebbles, it now appeared to be running fine. After launching again it started to rev up to 5000 rpm then die even though the rev counter flew up to 8000 it just refused to pull through the water. Now its home and running on the hose I have replaced the plugs and fuel filter and now if you blast the throttle from tick over to full it revs nicely and bounces of the rev limiter like it should do, But if you rev it slowly it gets to 5000 again and bogs down almost like its starved of air or fuel? There is no one local who I can take this to so all help is appreciated
cheers
P.s Its a 2003 gtx 1500 155

 

[ski-d00]

You either still have something stuck in your pump or you ruined your wear ring/impeller/carbon seal with said pebbles. You should be in a minimum of 1 meter deep water at all times while it is running.

You may have gotten water in the motor when you flipped it. How does your oil look? What is your compression? Have you done a leak down test?

I don't think I'd blame the ski as much as the user. I hope your not bouncing it off the rev limiter while on the trailer. That is not good for it at all and can cause major issues with those rpms and no load.

 

[Rrm1387]

If your turning the right rpms and not getting the speed its the wear ring . I had the problem that a spun the shaft splines in the impeller.

 

[Coastiejoe]

Impelller and or wear ring issue,,

If it revs high but you go no where fast,, the impeller is slipping within the wear ring. This is due to a bad wear ring, impeller, and or Carbon Seal (CS). But in your case, you KNOW you sucked up debris. So I am going with a wiped out wear ring.

Just some info,, running the ski on the hose does NOT cool the engine. You should NOT run it for more than a minute or so. You will damage the CS and it will suck air from within the hull and cause a cavitation issue much like you are having now, just due to a different reason.

Until you service the wear ring and do another water test, you are kind of wasting your time with any other potential issue,,

 

[Hawk388]

Since it has been so long since I've owned a Ski, I was thinking the same as ski-d00.

Revving it to the limit out of water is, at best, ignorant. You should never exceed 5k RPM while revving to expel water during a flush.

You've obviously ran the PWC in VERY shallow water. You've sucked debris into the intake grate and, the Impeller. You have VERY likely damaged the impeller, which alone would account for lack of speed at higher RPM's, however, I'm pretty sure the wear ring is now also damaged as per Coastie's comments.

Sir, you have a LOT to learn about your investment. You're out there flapping with no real knowledge of HOW to maintain your Jetski. I would highly suggest you learn a LOT more about these very delicate, yet highly entertaining, pieces of equipment before you go further.

 

[hulmey]

Ok all comments taken on board,
Please accept that as a first timer this is all new to me, I am far from stupid maybe just as you put it ignorant to know the danger of what could and what has happened. Lesson learned :ack:
Now then, Upon your comments and a phone call to a dealer I have removed the pump assembly and supported the shaft with a make do hole in a plastic cup to save it bouncing around, Please this was advice from a service centre,
I ran it for a short time and it runs fine so the pump is the problem, I have ordered the ring,bearings and a new impeller. Do I need any specialist tools to rebuild this myself,or can anyone advise me how to go about rebuilding this myself.
Thanks for the replies

 

[hulmey]

Before you lot get angry it was a plastic plant pot not a cup that supported the shaft. As before I am very hands on and a train mechanic by trade so if there is a how to out there that I cant seem to find,a point in the right direction would be very appreciated.

 

[ski-d00]

Well, before you order new parts, you should take it apart to see what is wrong with it first. I doubt that you need new bearings as they are very reliable. You will need an impeller removal tool to take the impeller off, make sure to get the correct size. Take some pics of the impeller and wear ring and post them. We always like to see carnage of what not to do.

You shouldn't run it all with the pump assy off. I doubt your plastic cup support for the driveshaft is very reliable and if the driveshaft is off center and gets a wobble it can do major damage not to mention that it could be dangerous. I wouldn't trust a local shop if they told me to do this.

 

[ski-d00]

you should download the pdf service manual, it can be googled and easily found for free. then download and read the owners manual as well, lots of good info for beginners.

 

[Coastiejoe]

I ran it for a short time and it runs fine so the pump is the problem, I have ordered the ring,bearings and a new impeller. Do I need any specialist tools to rebuild this myself,or can anyone advise me how to go about rebuilding this myself.
Thanks for the replies

You can use a hammer metal round stock to do the bearings but it is MUCH better to use a press. If it were mine, I'd get it all ready to go then go to any local machine shop and pay them a few dollars to press the bearing. This way the seal will not get damaged..

 

[hulmey]

Well folks that's the good old English that will do attitude for you.
I have the pump disassembled and the impeller doesn't look that bad. How can this affect the running so badly? The impeller does have some battle scars and the wear ring is shot. Looks like someone has been in there with a blunt knife and hacked away like a mad man. Can this cause the running to be so drastic?

 

[Coastiejoe]

The impeller does have some battle scars and the wear ring is shot. Looks like someone has been in there with a blunt knife and hacked away like a mad man. Can this cause the running to be so drastic?

Impellers are metal and take a fair amount of abuse, but unlike a propeller, their fit within the wear ring is critical. Some battle scars won't kill you. If any of the blades are bent, it is done. Either replace it and or get it rebuilt.

All the damage in the wear ring is from the pebble that were trapped at the edge of the impeller. The wear ring must be replaced. The gap should not be wider than the width of a dime. Anything more and the imperller spins within the wear ring as i should, but the water slips by instead of being pushed through. Impellers look like propellers but act totally different. At a minimum you need a wear ring.

Do not buy a cheap aftermarket, they just are built good enough. Either get an OEM or a Delrin brand.

 

[Hawk388]

Well folks that's the good old English that will do attitude for you.
I have the pump disassembled and the impeller doesn't look that bad. How can this affect the running so badly? The impeller does have some battle scars and the wear ring is shot. Looks like someone has been in there with a blunt knife and hacked away like a mad man. Can this cause the running to be so drastic?

I would strongly suggest you post pictures of the impeller and anything else you're concerned about. These guys know what they're talking about with this stuff and will be better able to give opinions if they could see the damaged areas.