motor frozen

[KMD]

I bought a 1997 seadoo and the top end of the motor was off exposing the pistons. It was probably like this for 4-5 years. I have the motor out on a bench and I cant get it to turn, the pistons seem frozen in the cylinder walls. I have a 4’ pipe wrench that I put on the PTO and I braced the motor and I cant seem to un freeze the engine. Any suggestions? I wanted to send this motor away for a rebuild exchange but was wondering if its rebuildable like this.

Also I was pulling the carb off and one of the bolts was seized. I put some heat with a torch where the bolt threads into the intake. I got the bolt out but I ended up melting the plastic bearing on one of the carb shafts, that’s right next to this bolt I pulled out. (yea I was an idiot).

Any help would be appreciated.

 

[LouDoo]

If it were me, I'm not a professional mechanic, I would put the head back on, send it to an engine rebuilder and get a "new" crate engine. If the engine is frozen it will probably need a top and bottom end rebuild.

The carbs. are going to need to be rebuilt anyway and hopefully you can get the plastic bearing that you need.

Lou

 

[Sink]

Have you put anything in the engine to try and loosen it up like penetrating oil??? That's where I'd start. It's all dried out and I'm sure there is some rust.

 

[jreitter]

your main bearings are more than likely locked up. if those are locked or rusted somehow the crank wont turn thus the pistons wont go up and down. the whole thing will probably need taken apart

 

[470]

I would have the crank rebuilt. To get the pistons loosened up you can use transmission fluid. Just pour some in the cylinders and let it sit for a few days.