Pistons are stuck

[85ragtop]

I have an engine as given to me. I was told that it was kept in a barn away from rain. Well I go to take the heads off (which I am not going to use) and the freakin cylinder walls are rusted badly. So I cleaned them up as best I could, took of the rod caps and tried to tap the pistons out. The stupid things won’t move. I have done this several times in the past and never have I had this much trouble. Can someone help me with this?

 

[blownlxvert]

spray a little rust penetrant down the cylinder and let it do its thing.

 

[RYC CUKR]

put some marvel mystery oil in the cylinders and let it set for a bit and see if that frees them up.

 

[srothfuss]

Either penitrating oil or regular oil liberally applied to the tops (and bottom) of the pistons.

You'll need to let the oil soak the rings for about 1 day and then rotate the motor and hit the bottom of the pistons with an oil can (if possible)

 

[85ragtop]

Thanks you guy. I put some PB blaster in there last night. I see if it worked.

 

[86bluecobra]

ATF is also a good oil to try to free up pistons.

 

[5ive.oh]

Red vinegar. Sounds strange but I used it on an old dirt bike engine.

 

[Henceforward]

Thanks you guys. I put some PB blaster in there last night. I'll see if it worked.

I would have used try PB blaster too.

 

[Shakerhood]

That Seafoam Stuff may work too.

 

[dastang2]

somebody said it already, automatic tranny fluid works great on this. i once locked a motor up while showing it to a potential buyer. i put a new dizzy in it and a jammed it in there without making sure the oil pump rod lined up. i reved it a few times and it quickly locked up. poured that in the cylinders and it sat overnight and worked.