How do u unseize a 340 motor...or any motor

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440magnum

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Just wondering about other members experiences. My way was as follows. Removed the plugs poured tranny fluid into the holes and tried to hand crank the motor. Nothing. A mechanic told me to use diesel fuel, not oil, fuel. He said it was thinner and a better lubricant than tranny fluid. Tried that. Nothing. Kept at it. One day I tried hand cranking it and buddy wanted to go for a beer. Don't we all? I said one more try. I gave a good heave on the breaker bar and damn if that motor did'nt break free. And damn if that beer did'nt taste great. Anyone have any different,better ways. To unseize a motor , not drink beer :)
 
Fill it with diesel fuel literally. Let it sit and once every few days bump the crank with a breaker bar. Saw a guy do that to a 289 in a couger. Didn't even rebuild it. Got it freed up drained it put oil and filter and drove it.
 
Dubob said:
Fill it with diesel fuel literally. Let it sit and once every few days bump the crank with a breaker bar. Saw a guy do that to a 289 in a couger. Didn't even rebuild it. Got it freed up drained it put oil and filter and drove it.
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An old machinist told me to use diesel and acetone..nail polish remover... Buy it at dollar store...said he used this to unfreeze old Tractor motors that had been sitting out.. I tried it on 3 sets of gears I bought real cheap... IT WORKED !

Put the block in a heavy leaf bag or container mix 8 oz or so with 1/2 gal of diesel ..pour it down the cylanders...seal it up tight and let it sit for a week or 2
In the sun if possible..

There may be a modern a modern solution for 100x the price ?
 
i like aerokroil for rusty seized bores. usually only takes a few hours to unseize the rings. I also gently tap on both sides of the piston top to get them rocking a tiny bit as im trying to get the engine freed up.
 
Marvel Mystery oil to the top. I let it sit for a day. With a Breaker bar on the crank, I'd give it a few pounding shots with the hand every now and again. She was free and spinning the next day.
 
My dad used Kroil in a 4 cylinder Detroit Diesel that got a bunch of rain water in it. Took a few days but it worked. I've got a 354 Hemi in the garage soaking with KROIL right now.
 
Have used Marvel Mystery Oil, diesel, and even used oil that I have drained out of vehicles...mixed it with kerosene and let it sit. Check every day or so, keep all cylinders fill and every now and then give it a jarring shot with an impact gun.....just don't use it turned all the way up. You are not looking for torque, just the impact.....
 
One thing I've learned on seized motors: If it's out of the vehicle, pull the pan. Spun rod bearings can lock a lock a crank something fierce.
 
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