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1951 Engine Seized

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LeoM
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1951 Engine Seized

Postby LeoM » Sun Jul 26, 2015 10:10 am

I bought a 1977 Cub and got a 1951 with it for free. The 51 looks real good. Always kept in a clean barn and the only rust is surface rust around the battery box. The engine is seized. I tried just soaking the cylinders with Kroil and rocking it back and forth to no avail. I pulled the head and it appears all 4 pistons are frozen. I am planning to drop the pan and remove the rod bearing caps so I can work the pistons one at a time. I expect to find the cylinders needing to be seriously honed or bored out Any advice on how to best proceed is appreciated.

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Re: 1951 Engine Seized

Postby Barnyard » Sun Jul 26, 2015 10:17 am

Have you tried removing the starter and turning the engine backwards to see if it will budge? I cured two of them like that.
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Re: 1951 Engine Seized

Postby ScottyD'sdad » Sun Jul 26, 2015 10:17 am

I use a wooden "pin" the diameter of the bore, cut flat on the bottom, and tap it with a hammer, to free the pistons. I've used it with a hydraulic press, on some extra stubborn pistons. Tap the wood pin, add Kroil, give it time to seep in, and repeat.If that doesn't free it, I use the press. Once freed, hone above the piston, lubricate, and push it out the top.
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staninlowerAL
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Re: 1951 Engine Seized

Postby staninlowerAL » Sun Jul 26, 2015 12:56 pm

If the starter is not stuck then your idea is probably the best way to go. I just freed a 154 C60 engine by dropping the oil pan and rod caps so I could work the pistons one at a time. Depending on the position of the crank lobes, it can be a bit of a challenge to get to the wrist pin boss on the pistons which IMHO is the best place to apply force. I used a 1/2 inch rod and lube on the top and bottom. On one piston I had to remove the top half of the rod bearing to move it downward enough to break the bond between the piston and cylinder wall but it moved upward after that. You might have to remove the ring grove at the top to get the pistons out. Cast pistons can stand a bit more force than the aluminum ones without damage. Keep track of the pistons and the matching bores as well as the side the rods face and the bearings locations if you plan to put them back in to test the engine. It's definately doable, just a bit time consuming. Stan
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