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Engine won't turn over by hand after dying out on water

rok99

New Member
Hi Everyone,
I have a 1993 Sea Doo GTX with the rotax 587 engine (white).

I recently went through a bunch of maintenance: carb rebuild, new starter, solenoid, fuel lines, fuel and oil filter, oil lines, the works.

Then, as I went out for the first ride, I broke my ankle walking down to the ski on the beach.

I took it out for 2 rides even with the injury and toward the end of the second ride i noticed that the curved exhaust pipe (tuned pipe?) was leaking out water. One of the 4 bolts turned out to be stripped by the previous owner.

As i got the ski back and noticed it was taking on water in the hull, it started to slow down. I hit the kill switch before it shut itself down and swam it back with one leg. I think that the salt water added a lot of resistance to the ground wire going between the battery and starter because i couldn't get a click out of the starter solenoid.

Because of the broken ankle, I left it anchored in the ocean for a week until I could get someone to take it out of the water. It wasn't towed since i anchored it right in front of a launch and it was able to be walked back.

One week later, with the ski out of the water, I charged up the battery and tried to start it. No solenoid click, and trying to bypass the solenoid no starter action.
I tried hooking jumper cables directly to the starter to test the starter directly. The starter made a noise but the engine didn't crank. So it appears the starter isn't bad.

Trying to hand turn the engine, it won't budge. I poured a bunch of PB blaster into the cylinders and waited a few hours but no dice hand turning. I didn't have a pipe wrench and only a small pair of vise grips (and it's difficult to do these things on crutches) so I only made 1 small attempt to crank the engine that way.

Apart from the broken foot, I am also going away for 8 months fairly shortly. So, a few questions. I want to troubleshoot this the best I can to understand how I can rescue the ski. Do I need to be thinking about a rebuild, or, could it be that there was a small amount of water or humidity that caused the rings to become seized enough to be hard to start? If I want to use some more force to hand crank it, where should I grip and how? Is there anything else this could be?

I am thinking of trying to take the engine out to take it with me while I am away to rebuild it in my free time, or, trying to source a new motor to rebuild while I am away so that next summer I can just drop it in. Should I only look at 587s or could I look at a 717 or 787??

Thank you. Curious for any thoughts.
 
I wouldn’t even consider putting anything but a 587 back in, if you want a 717 or 787 it will be much more cost and time efficient to buy one that already has that motor. I wonder if the water leaking into the hull has anything to do with the motor being seized since you shut the engine off, it’s not like you sunk it and ingested water into the motor. Did you take the spark plugs out when you were trying to turn it over by hand? Did you try turning from the PTO flywheel? Try taking the starter off, maybe it’s seized in the engage position since it probably had water sloshing over it. Have a look at the impeller just in case by some freak occurrence it seized or got something lodged in there. You could take the pump off to eliminate that possibility or unbolt the engine and slide it forward off of the driveshaft. With the driveline detached, the plugs out, the starter and spark plugs out, if you can’t turn it over by hand at that point, it’s time to disassemble the engine and see what’s going on.
 
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