how to remove a siezed piston in a diesel engine cylinder?

Question

this marine engine has had water in the no 3 cylinder for 3 months.
head is off and its had the marval oil treatment but still immoveable by the crankshaft pulley. If a total rebuild is required, how do i get the piston out with mimimun damage to cylinder walls

Answer 1

go ahead and remove crank and all other rods pistons etc. now make a plate out of 1/4 inch steel and drill holes in the pattern of the head bolts [use the old gasket for laying out the pattern , then get some really long bolts or studs of high quality and sandwich a hydraulic bottle jack between the top of the piston and the plate you made.now pump the jack until the piston starts moving down the bore, now stop [the piston probably cannot be removed from the bottom of the engine block] clean up the bore above the piston and remove it from the top [it will still be hard to move but it will come out ] note: that cyl will either have to be re bored or sleeved due to rust in all likelihood. and that #3 piston will make a good ashtray. good luck.

Answer 2

Umm, you can't get it out from the head. There's usually 4 parts to the engine. The valve covers, which go ontop of the head, which goes ontop of the cylinder walls, which goes ontop of the bottom part of the egine. You have to pull the engine out because the cylinder housing is usually attached to the engine mounts. When you pull the engine out, you turn the engine upside down and disconnect the piston from the underside.

Answer 3

We used this trick on an old tractor once:

get the necessary fittings to screw a grease gun into the spark plug hole, then make sure both valves are closed (you may have to remove the rockers or cam, depending on the engine), and pump up the grease gun. You may have to do this several times, but a lever type grease gun is capable of developing very high pressure.

Answer 4

Dry Ice.....but it sounds like there's already an extreme damage to the cylinder wall. Good luck.

Answer 5

Well, you'll have to take the engine apart enough to get to the underside, and begin dead blowing, or hammering it out, with a brass hammer, or dead blow hammer, so not to damage bearings and ding up other pieces of equipment. Hope that helps.

Answer 6

more than likely the block is sleeved depending on who manufactured it so i would try to pull the sleeve with the piston still in it.
if its not sleeved then try to punch it out and cross ur fingers, use some heat if you can but be careful to much heat will weaken ur block