1998 Gtx Ltd Part-submerged

[BOND007]

Hi, I recently posted that I was buying a low-hours 1998 GTX LTD. After ourchasing I tested it thoroughly and it ran perfectly, apparently meeting all performance specs. On the fourth outing a faulty drain plug allowed water into the hull/engine room while the ski was sitting at the beach. The water filled high up on the engine - enough to get in the inlet. We drained the hull, removed the plugs and blew out a whole lot of water. We then 'fogged' the motor several times with Bombardier lube, both in the inlet and the sparkplug holes. We kept fogging and cranking until we only got lube out. Then we inserted new spark plugs and tried to start. It started and ran pretty well straight away. We then connected to a hoseline to flush and started the flushing in the normal way. The engine started and ran normally, and would rev cleanly to 6000 when the throttle was blipped. However after a short time the overheating buzzer came on and we had to kill it.We noticed there was less than normal water coming out the back and only a dribble coming out the two centre vents under the towhook. We turned it off, let it cool and tried again, this time at a steady 3000rpm. Again it overheated in a few minutes. It seems like the cooling system has deveoped a blockage?
Any suggestions on what to do? Best. Rob

 

[kustomkarl]

Rob, First off you not suppose to run your seadoo on the hose to flush it for more than 5 minutes and not above idle speed. It is possible that the hose just can't supply enough water to cool the engine. The jet pump seals and bearings don't get any cooling when running on the hose either. I recommend that you run it in the water to be sure it is cooling properly. If you heard the buzzer go off means it got hot and it is not a good thing.

Karl

 

[BOND007]

Karl, thanks for the reply, unfortunately it came a bit late and I had to get some info quickly as it was my understanding that a Seadoo needs to be run pretty quickly after a submerge. I located a mechanic near where I was staying and and he advised me to get it in the water, start and test it and then run it for at least an hour at a wide range of revs. I did this and the ski was fine. I performed all the the other follow-up instructions as per the manual and it ran fine. I have had several 6-hour days including continuous ski-ing/wakeboarding since and so far no problems.
For the record I did not voluntarily over-rev on the flushing hose. I was running at a fast idle as per the manual for 3 minutes, then shifting the fuel tank to off. As the jetski ran out of fuel the engine went into high-rev - about 5000 - and the engine temp sounded and showed about 120deg on the display. The engine couldn't be cancelled by removing the DESS, hitting the stop button or even removing the battery connectors. I eventually found that if I blipped the thottle it would stop over-revving and return to idle, then shut-down OK. A local mechanic told me this was common with earlier model Seadoos. The problem with the over-temperature was indeed water-flow - the stop-cock in the hose was jamming and only opening partially.I replaced this. Thanks again.

 

[kustomkarl]

The reason the engine would rev up after the gas was turned off is because it was leaning out of fuel...The engine will work like a RC,(radio control) car with a glow plug. Because of the hot temperature the engine will run even if you disconnect the spark plugs because of the high temp of the spark plugs as in a RC car that only has a Glow Plug. To stop this problem of over revving in the future...open the choke and stall the engine.

Karl

 

[kustomkarl]

The reason the engine would rev up after the gas was turned off is because it was leaning out of fuel...The engine will work like a RC,(radio control) car with a glow plug. Because of the hot temperature the engine will run even if you disconnect the spark plugs because of the high temp of the spark plugs as in a RC car that only has a Glow Plug. To stop this problem of over revving in the future...open the choke and stall the engine.

Karl

 

[BOND007]

Response to Karl

Karl,
Thanks for this. Twice-over!
Best
Rob