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Seadoo GTX 255 limited SUNK QUICKLY!

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dannyz

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Just had some work done do ski, see thread below...
http://www.seadooforum.com/showthread.php?81516-2009-GTX-iS-255-ltd-Performance-Top-speed-issues


Well BAD news guys!!!!

Picked up my ski Saturday after the new solas prop, wear ring, supercharger rebuild and full service. Yesterday I decided to take it out for the first ride since the work.

SHORT STORY:
Jet ski Sunk and engine died within 90-180seconds of putting it in water.

LONG STORY:
Wanted to test it all out and see how this prop and supercharger rebuild performs. Back the ski into the water, (bungs closed of course) push it off the trailer and jump on.. Starts without hitch and ride it 30meters towards the pier whilst my old man parks the car. Half way to pier the engine splutters and dies and can not be restarted, me wondering what the hell has happened continues to try restart it 2-3 times with no avail.
30 seconds later i had floated to the pier and just tie up. realising immediately that i feel a bit low in the water i see its taking on water VERY VERY quickly and within another 30-60seconds its completely ass down nose up FULL of water.
All this happened again within less then 2 min.
Luckily enough it did happen so suddenly, and only in the marina, and not out in the ocean.
The guys at the marina helped out amazingly, towed it to other pier, put it on a boat fork lift, drained it and put it back on my trailer...
One thing that we noticed was that all the water was pouring (ALOT) out of the jet pump area (is it a jet pump seal or something to take on and vice versa pour out so much water so quickly?)

Regardless, i took it within the hour back straight to the workshop and they are dealing with it.. They were great about it and said they will sort it out, and apolegetic.. Lets hope they take full ownership of problem however significant it is. 2 weeks prior to this full work/service i was out on the lake/river and it was flawless for 2 whole days without a drop of water in hull..

What could it be? and I'm really worried about my motor now? is that stuffed? I tried to crank it after all water was drained, started for 20 seconds then died, so i just left it..
 
Likely the boot that connects the carbon seal to the hull failed. Or, the carbon seal itself failed or slid back on the shaft.


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will it fill up rapidly if this fails? (and empty all water out really rapidly out of jet pump) and will the motor cut out and die prior to it submerging in water?
 
I would expect the water to be draining from the intake grate and not the nozzle. Also, if your carbon seal or bellows failed it will rapidly fill the hull.
 
My money is on the carbon seal failure. Actually, you might find that someone didn't install the boot properly after all that servicing, but regardless I'm with Coastiejoe that the seal failed. Keep us posted.
 
Thanks Guys... well see...

Good news is that the service centre have confirmed that the engine is fine, no water in it and running.... they are putting it into the tank soon and checking for leak.


Also, i have video of the water draining from the ski, all the water is coming from jet pump area and flowing from ride plate.. not a drop is coming from intake grate area where carbon seal is.. does this mean anything?
 
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I was reminded by my tuner just last week that if your taking on water like this the most important thing is to not run the engine, when its off the valves are closed and you nearly eliminate the water intrusion into the engine concerns. So the best thing that may have happened was that you were off and docked.

Just a mental note to remember that even if your out 5 miles from the ramp, better to shut-r-down and get towed than to start up the engine and try to make it back under your own power.
 
Correct about the valves. All are closed on the 4-tec when engine is off. Water can get to the valves, just not into that cylinders. That happens when you crank it. SOOO, pull the valve cover, clear the water, put the valve cover back on, and you would be ok.


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Maybe a cooling hose popped off and flooded the hull or the driveshaft carbon seal/bellows failed. I believe you're in good hands with your service shop, they can easily recover this if no damage was done while the engine was huffing water. Especially if they found no water ("milkshake" = oil+water mixed) in the oil. Not always the end of the world if taken care of quickly.
 
AS I stated in your other thread, I'm betting the main pump hose going to the IBR through the hull was not tightened...you know just to be different from others. ;)

I have this exact ski and that exact same thing happened to me straight from the dealer. :facepalm:
 
One more reminder.

When I had pump/carbon seal/shaft work done two weeks ago. I backed down the trailer, got the pump under water, let it idle for two minutes with seat off and a flashlight. Then got in and idled for 30 seconds within a10 ft radius, seat still off before I ever considered heading down the canal.

Standard over precautions are a wise choice with any ski after anything related to water intrusion has been removed or touched.
 
Yep all confirmed, exhaust clamp popped and stalled motor then filled with water... Good news, motor and all components are fine and cleaned .. She is ready to go...
 
Great to hear. Now go ride and have fun. Let us know how it runs.

Good call 3ftDeep.
 
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Hopefully get it in the water tomorrow or Monday and test it out again... They assure me all is fine with motor and no leaks whatsoever... They had it running in their tank for 15minutes.
 
Update...

Gave it a thorough clean with hot soapy water in the hull, and let it dry out and sprayed lube everywhere..

Ok, had it in the water today... all is perfect and runs great.. Initially I took it to the service centre because i wasn't hitting more then 96kph (59-60mph) and was feeling a bit underpowered and cavitating from stand still.. All i can say now is WOW this thing is a beast and feels more powerful then it ever has.. GPS speed i hit 113kph (69-70mph) and the acceleration is phenomenal.. so all in all its great and happy with the final outcome (after quite a scare of course)...
 
It is in the manual. When the engine is turned off on a 4-tec, all valves are in the closed position. This was done to help prevent water ingestion if you fall off and the engine is shut down via the cord. Does it work perfectly? No. As water can and does sit on top of the valves and does enter the cylinder when you crank it. I would think the only way to prevent this is to pull the valve cover and remove the water BEFORE you crank the engine.


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Coastiejoe said:
It is in the manual. When the engine is turned off on a 4-tec, all valves are in the closed position. This was done to help prevent water ingestion if you fall off and the engine is shut down via the cord. Does it work perfectly? No. As water can and does sit on top of the valves and does enter the cylinder when you crank it. I would think the only way to prevent this is to pull the valve cover and remove the water BEFORE you crank the engine.


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Click to expand...


Removing the valve cover will do nothing to get water out of the engine.

Water will get into the cylinders through the exhaust valves by water coming up from the water box or through the intake valves if the intake manifold is waterlogged.
 
Tytan said:
Removing the valve cover will do nothing to get water out of the engine.

Water will get into the cylinders through the exhaust valves by water coming up from the water box or through the intake valves if the intake manifold is waterlogged.
Click to expand...

With the 2-strokes, you are correct. With the 4-tecs, all the valves close. Yes, the water WILL come through the exhaust manifold, but it will NOT enter the engine until you crank it. So, removing the exhaust manifold would make more sense to remove the sitting water, but I read that the valve cover needed to be removed to get to the sitting water. I can not confirm that this is correct as far as the valve cover goes, only passing on what the text said.
 
Here is a cut and paste,,,

The Rotax 1503 engine is an engineering masterpiece, the only 4 stroke engine specifically designed for watercraft use, the only watercraft engine with a closed loop cooling system. It is now available in several variations from the new 135hp found in the 2006 GTI range right up to the wopping 215hp supercharged intercooled monster found in the Seadoo RXP/RXT/GTX LTD and is also available in various Sea doo jet boats.

It has 1503cc 3 cylinder’s single overhead cam pushing 12 valves. The engine is a dry sump variety running with twin oil pumps and a tip over protection system to stop the oil from flowing to unwanted areas in the case of the watercraft being inverted. Valve timing is designed in such a way that every time you turn off your 4 tec equipped Sea doo the engine will stop with all 12 valves firmly closed to make water ingression almost impossible.
 
Coastiejoe said:
Here is a cut and paste,,,

The Rotax 1503 engine is an engineering masterpiece, the only 4 stroke engine specifically designed for watercraft use, the only watercraft engine with a closed loop cooling system. It is now available in several variations from the new 135hp found in the 2006 GTI range right up to the wopping 215hp supercharged intercooled monster found in the Seadoo RXP/RXT/GTX LTD and is also available in various Sea doo jet boats.

It has 1503cc 3 cylinder’s single overhead cam pushing 12 valves. The engine is a dry sump variety running with twin oil pumps and a tip over protection system to stop the oil from flowing to unwanted areas in the case of the watercraft being inverted. Valve timing is designed in such a way that every time you turn off your 4 tec equipped Sea doo the engine will stop with all 12 valves firmly closed to make water ingression almost impossible.
Click to expand...

I think coast i.e. Is correct. I believe with my limited knowledge that my engine filled with water because I cranked the engine with water filled exhaust and intake manifolds. Disclaimer on limited knowledge on 4tec skis. :)
 
jhjesse said:
I think coast i.e. Is correct. I believe with my limited knowledge that my engine filled with water because I cranked the engine with water filled exhaust and intake manifolds. Disclaimer on limited knowledge on 4tec skis. :)
Click to expand...

And most do the exact same thing as you did, so don't feel bad about it. Now that I KNOW about this, I would NEVER crank my 4-tec until I get it home and clear the standing water... No sense in running it through the engine.
 
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