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Stuck 206 B MM engine

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mark vollmer

07-27-2001 08:45:50

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The bo ys and I are working on an old tractor from our farm - a MMZAS. The engine is stuck, and we are looking for any type of solvent that may help free up the motor. Any ideas?

I know we can get pistons, but they are very exensive, and we would like to free up the pistons without breaking them.

thanks in advance for your assistance.

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BOB

09-04-2001 13:29:51

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Re: stuck 206 B MM engine in reply to mark vollmer, 07-27-2001 08:45:50

IF YOU DO FIND SOMETHING TO FREE UP THE ENGINE AND YOU START IT, YOU WILL DESTROY IT, AS THE CRUD AND GRIT WILL CUT IT TO PIECES AND DESTROY THE CYLINDERS, AND THE PISTONS.

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D Ward

07-29-2001 16:53:02

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Re: stuck 206 B MM engine in reply to mark vollmer, 07-27-2001 08:45:50

I used Marvel Mystery oil, but have also used 30w and diesel, after an eternity, weeks, I used a piece of hedge post (31/2" dia x 4' long) as a tamping rod and tamped about ten to twenty times a day each piston. After about 3-10 days they come free. Another time I put the tractor in gear, after filling the chambers with "oil" mix and letting set weeks leave the plugs out, and drag the thing around the farm with a bigger tractor. PS, the later technique won't work on stand alone power plants, even in a fit of frustration.

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Kelvin

07-27-2001 20:50:02

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Re: stuck 206 B MM engine in reply to mark vollmer, 07-27-2001 08:45:50

Here's what I have done in the past:

pour diesel fuel, olive oil, Marvel Mystery oil, or your favorite mixture in it and let it sit for a while. About 4 months is all I could manage to wait.

Then, I really got nasty. I pulled the blocks off the crankcase with the pistons and rods in them. (You can get them out in one assembly with the cyl. head on them. Just dont use the manifold as a lifting hook. I removed the head and ground the valves. Then I packed as much general purpose grease in the cylinders as I could and reinstalled the head with the old gasket. Using a hand grease gun and an adapter that would fit a grease fitting into the spark plug hole, I forced grease into the cylinders and pushed the pistons out. If you use a hand grease gun it will take quite a lot of pumping and several pounds of grease.

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Qtrhoss

08-10-2001 10:39:05

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Re: Re: stuck 206 B MM engine in reply to Kelvin, 07-27-2001 20:50:02

CAREFUL!
A standard grease gun can produce pressures of up to 3500 psi. On a 3.5 inch bore, this equates to 33,674 pounds of force. Most likely the cylinder will not handle this pressure and it will split. Yes, this will work but I would try using as much of the lubes, fuels, and fix-it-in-a-can as possible first.

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