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Stuck Piston

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Don E. Foster

05-06-2001 11:05:35




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I have been soaking the piston (head off) with Kroil for a month...no results yet. Any Ideas?

I thought once maybe there was water in the cylinder before I poured the Kroil in and maybe the oil was floating and not getting to the right place. So I cleaned it all out and then put a weed burner flame to it to dry it out. Didn't help. The cylinders look great. #3 was rusty as the muffler was shot and let water into the open valve.

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Gordon in IN

05-07-2001 21:59:26




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 Re: Stuck Piston in reply to Don E. Foster, 05-06-2001 11:05:35  
You might try cleaning all of the rust out of the clyinder with scrapers and/or abrasives, be sure to get all of the residue out of the cylinder, use compressed air and multiple applications of your favorite penetrating oil/lubricant and wipe it clean between compressed air cleaning cycles. Then using a short piece of hard wood and a SMALL hammer, gently tap on each side on top of the piston to "rock" the piston back and forth, adding additional quantities of penetrating oil while you are doing this. If you can get the piston to move down until you can see where the top ring was in the cylinder, clean that area of the cylinder as well as you did the rest of the exposed cylinder previously. Then try to move the piston UP to free it(see below about moving the piston UP). If this does not work. Remove the pan and the rod cap on the rod of the stuck piston. Rotate the crankshaft away from the rod of the stuck piston. Then use a piece of hard wood on the top of the piston and a LARGER hammer to try to drive the piston down and clean the cylinder as you go. Check progress often, you do not want to drive the connecting rod into the crankshaft and damage it. If at any time you try to move or drive the piston UP be sure to securely retain the sleeve with washers or bar stock held down by the head bolts or studs and spacers and nuts. You do not want to pull or move the sleeve at this time. Do not move the sleeve unless you want to put in new sleeves or replace the "O" rings between the sleeve and the block. Good luck, if this does not work there more agressive ways to move a stuck piston but they are not normally required. If all else fails, remove the piston, sleeve and connecting rod from the block (as a rusted together "UNIT"), then using a grinder notch the sleeve full length on each side and split it with a hammer and chisel to salvage the connecting rod and perhaps the piston. Then get a good used sleeve and new "O" rings or a new sleeve and new "O" rings and install it in the block. Gordon in IN

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Gerald Lee

05-07-2001 12:50:00




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 Re: Stuck Piston in reply to Don E. Foster, 05-06-2001 11:05:35  
My AC Model C was stuck when I got the tractor last summer. Tried soaking, pulling etc. with no success. I pulled the head off and filled the cylinders with brake fluid. I then took the starter out so I could see the flywheel from the rear of the tractor. I then took my propane torch and ignited the brake fluid in the cylinders. The heat expanded the sleeves and the fluid went down between the pistons and the sleeves. I let the fire burn for about 15 min. I put the fire out and began rocking the tractor by hand using the rear wheels. While rocking the tractor, I watched the flywheel through the starter opening. After about 5 min of rocking the flywheel started to turn. I then slowly turned the engine over using the hand crank, forcing the brake fluid out of the cylinders. I then cranked the engine with the hand crank for awhile keeping the cylinders lubricated. This is how I freed my stuck engine.

I recommend of course that the gas tank be removed, do this in an open area, and that you have a friend stand by with a fire extinguisher.

Best of luck ....Gerald Lee

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