2007 rxt seadoo water cooling issues

[Beach Addiction St Kitts]

hey all

When I rebuilt my jet pump with all new parts after the impeller bearings went, I didn't put a plug into the top where it sucks water from the jet pump because the old one got ruined and the new one was missing that part. When I had issues with the exhaust over heating to the point that the rubber sleeve started melting and smoking inside the ski, I was told to check the seal where the jet pump mounts onto the ski as a bad seal may be causing the issue. Figured it was the missing plug. Got it and exhaust seemed to stay cool to the touch so figured I was losing the suction and now it was sorted. I do flyboarding and when I got the hose sucked into the intake grate and around the shaft, I had to take off the jet pump to get it out. After reassembly same exhaust overheating issue. Figured I'd put the jet pump on badly and lost the seal that I was originally warned about so I took it off, cleaned it up and reattached jet pump. exhaust pipe still seems to be getting too hot idling so took apart and reassembled jet pump again... so that's twice now i've take off the jet pump and reassembled it hoping to get a better seal to sort the overheating issue. still have problems. inspected the exhaust tank thing and found some sand in it. A lot of sand flushed out when i flushed it on land and i figured it had just been washed in from the outside through the back of the ski. Perhaps sand has been sucked through the whole engine though where it's sucked in from jet pump and is clogging it up. Only explanation I can find why I would still have overheating when in water but not when flushing connected to a hose is something in that line is blocked... Still dont understand water cooling system though because what appears to be water coming into the metal pipe from the exhaust... and only going as far as the exhaust... how does that water flush back up along exhaust manifold cooling chambers and intake manifold cooling chambers if water is only introduced on the way to the exhaust cooling tank... help please.... can i connect a fresh water hose pipe directly to the hose that runs up to serve the intake manifold, rather than to the flushing connection? the jet pump provides the force of water to pump water through the water cooling system, but I am concerned that providing not enough or too much water using a hose pipe may or may not damage it? Why doesn't the flushing connection just join the water line from the jet pump comes into the ski and follow the same exact route... like what i want to do to try flush it.

on another side note, when i reattach my jet pump, the splines area seems to have water in it. the boot is prob not sealing properly and wants replacing...

first major thing is getting the water cooling sorted... live on a small caribbean island with no seadoo aware mechanics so i have to do it myself... HELP PLEASE!!

 

[KK40384]

Back flush the system. Sounds like you sucked something up that's clogging your system causing the exhaust to overheat. Also if you overheated it, you could've damaged the exhaust temp sensor and you're getting a false reading. Another thing that happens a lot is if you're running high rpm at low speed the pump cannot get enough water in to cool off your exhaust fast enough. The system isn't designed to do that. If you're doing donuts or running a flyboard as you mentioned you can damage your ski. It was never designed for that. That said try flushing it and report back.

Water on your driveshaft splines is quite normal for the most part. Water inside the nose one of your pump where the grease goes is bad news. That's what kills bearings.

I assume you ride in salt water, are you following proper salt water slushing procedures after every ride. If not that can damage the exhaust cooling system sensor also. Salt is your enemy.

 

[Beach Addiction St Kitts]

When you say back flush your system... you mean standard land based flushing procedure? which i do regularly with salt away. the issue is that i have no problem when i flush it on land.... the overheating only occurs when in the water and so must be related to the suction/flow of water along the route that is not cleaned when you flush with the land based connection. I don't think it will be a problem for the flyboard as the flow along the hose is restricted and the pressure builds up if anything, so it will want to travel down the water cooling system more than it would as a typical jet ski...

question is this... can i disconnect the hose running from the jet pump and flush the engine with a hose along the same route that it it flushed when in the water and not from the usual flushing connection... or will that mess up the engine?

 

[ski-d00]

The exhaust cooling circuit has a simple flow pattern, check your manual. The j-pipe has 3 small holes in the end of it that become clogged, especially in salt water, and cause over heating. Remove the j-pipe and clean thoroughly. You can also confirm there are no other blockages at this time.

To answer your question. Yes, you can disconnect the inlet hose and attach your garden hose there to cool the exhaust system while idling(do not do this while the engine is not running as it will backflow and fill your engine with water) but more than likely since you have confirmed everything is fine with your pump that the problem is not with your pump but a blockage in the system.