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Got head off SC, full of suprises

D

dick benson

Member
I got the head off the SC to install a head gasket. Got new water pump and thermostat from John Saeli. Picked up a replacement radiator from another case collector. Trying to correct the overheating and water coming out of radiator problem. I guess I will have to do a complete head job assuming the head is not cracked. Found a push rod that has been welded and a broken intake valve guide? Dick, OR.
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Wow those pistons are totally different than my engine that is the same year as yours .What size are they? yea I had 2 different types of push rods in mine 2 of them are a different diameter. AT least one of them has been repaired.
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I replaced the head gasket in a 49 SC for a guy back in 97. His tractor had flat pistons. He had two number 3 connecting rods.
All of his exhaust valve were shot and had one broken valve rotor. Could not find valves anywhere.The machine shop reworked Wisconsin air cooler engine valves to work. I found a valve rotor for a Briggs and Stratton 11hp engine would work.
 
I saw an original set of 4 rotocap exhaust valve rotators and springs online for I want to say was about 100 dollars crazy. But good to know there is an alternative Mine had none installed when I took it apart.
 
Yea 3 5/8 is what I found in mine but there aluminum. I don't know for sure but they may have been cast back in the day.
Byron
 
The original standard pistons in all Case SC engines were cast iron with a flat top. Case later made aluminum pistons available for all SC tractors in standard and overbore sizes. The standard bore for SC tractors from 1941 to 1952 was 3.5". In 1953 and 1954 they switched to 3 5/8". Most tractors that were rebuilt were converted to 3 5/8" or larger bore, and/or were given some type of aftermarket compression boosting pistons. I don't think Case ever offered a button-top piston for the SC, but they did offer a high altitude piston. The button tops are probably aftermarket.
 
I've got the same pistons in my SC. They are 3 5/8" bore, but I have no idea as to the manufacturer. Looks like you've got a little bit of a job ahead of you. In my engine, I had a huge amount of rust and crud buildup around the back of #4 sleeve. Eventually, the block was eaten away around the top of the rear side of the o-ring groove casting of the block. I ended up using JB weld to build it back up to where it should have been. When I slid the new sleeves in I used High Temp RTV gasket maker on them to help seal everything up. Got it back together in 2009 and it is still holding strong - no leaks. I included a few pictures (one is of the inside of the block around #4 cylinder).
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Thanks for the clarification Christopher Mikesell I thought that would be the case. Do you know if the head gasket was always a 3 piece sandwich composite type gasket or was there a solid steel gasket
 
Nice looking tractor and a very nice shop. Looks like a single gasket for the sleeve is that right?.
 
I checked my pistons, they are 3 5/8.The head is being shaved a little right now to true it up. we checked it this morning and found no cracks. I got everything cleaned up and ready to go back together. Found a broken valve spring. I found one on e-bay, it's on the way. Got my gaskets and water pump from J Saeli. I was hoping to have it together by this week end but I won't get the new valve spring in time so it looks like next week. Dick, OR.
 
Dick I think mine is going to get more involved maybe rod bearings milling the deck on mine it is going to be costly because of the millsteps for the sleeves. It will probably sit for a while.
Good luck with yours Byron
 
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