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Allis C

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FarmallGuy1923

Member
Hi, I have an Allis C that has been in the family for a long time, and I am trying to restore it. My grandpa overhauled the engine about 30 or 40 years ago and parked it and it is now locked up. A few days ago I stuck some penetrating oil in the sleeves through the spark plug holes to try to unlock the engine, and I noticed that some penetrating oil is dripping out of the oil pan, which means that the oil is somehow getting past the pistons. Does anyone know whether this is a hard problem to fix, or do I just need to replace the rings and it will be fine? Thanks
 
Hard to tell until you get it to turn over. Don't forget to check for stuck valves. A stuck valve will act the same as a stuck piston until you bend a push rod or two.
If it was not run much and was kept in the dry you should not have to open it up. That may be a lot of if's.
 
Maybe no problem. Penetrating oil is very thin and could go through the ring gaps. Get it running and then do a compression check, that will tell the story. Best penetrating oil is a home brew of 50% ATF and 50% acetone.
 
If the tractor has been inside and the rings are lightly "stuck" to the liners, then the penetrating oil may loosen them and it will crank and startup. If you have good copmression after that, the rings have sealed.
If the tractor has had water inside and the rings and liners are rusted, then you might as well give up. It is not difficult to pull the motor and replace the rings. Gives a good oportunity to look at the liners, maybe put in new sleeve o-rings, and check that valves did not stick. If it has been setting without antifreeze that long, you might put new freeze plugs in the head under the rocker arm.
 
Been on here for a decade and no oil you can buy will work better then ATF. Done 20 plus engines over the years and only 2 did not free up. Check the archives
 
Rings will expand as they get hot. When engine is cold raw gasoline will run into the crankcase. That is what makes it necessary to change oil periodically, oil doesn't wear out. penetrating oil will go anywhere gasoline will. Use caution, soak the cylinders good and bar it over as someone said. I'll bet its good.
 
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