Stuck Valves

My Cub seems to hane stuck valves on the two center cylinders. I was wondering what tricks are there if any of freeing them without pulling the side plate or the head? Thanks

About the only trick I know if is to drop the entire tractor into a smelting furnace. The valves will free up just before the entire thing melts into a blob...

Really, neither operation is anything to fear or worry about. You can get the side plate off by removing the carburetor. The head comes off easily after you remove the hood, which in and of itself really isn't that hard.

There's no other way to get at the valves to see if they're really sticking or if there's something else wrong.

Take those two plugs out and put the pb blaster spray bomb to it.dont be askeerd use alot then turn eng over and let sit a day then start er up.She will smoke and skip for a few mins.but will run a bunch better after. Hoss

Take out the push rods,lube up the valves and smack them with a rubber mallet keep working them with lube untill they get a good snap and move fully.It works I did it to my M and my C both had stuck valves and run great now.

Howdy
Meant to post this before, GM Top Engine Cleaner
( I think the part number is 1050002 ) is probably the best you will find , Ive had luck getting valves unstuck on engines that have been sitting for 20 years ( indoors ). If the engine still runs there is a real good chance that this stuff will work and if it doesnt you will be suprised when you pull the head there will be no carbon to scrape. Buy several cans.
Bob S.

Hate to say it but you need to pull the head and side cover. When the manifold is off check the mismatch on the ports use the gasket to see how bad "port match".

There isn't any push rods or rockers it's a flat head , this is a very simple job.


Pull the oil filter lid off , you will find a pipe plug there or a hole i forget. This hole is what feeds oil to the valve train, put air to it to make sure it blows thru. If it wont then start with brake clean and everything else tell you get it clear.

My father found a 54 cub that had been sitting in a barn for 30 years for real. Well the valves were stuck in it , i took them out and cleaned everthing . They stuck again because the oil passage was plugged.

The area ware the oil filter sits is under oil presure so this port feeds oil to the valve train under presure.


You can also try running some ATF in the oil 1 quart ,it will clean the inside of the motor real well and may unstick that valve.

I have run the motors with straight ATF no engine oil but didn't work them very hard , it cleans them out real nice. A friend of mine swares buy "Sea Foam" he adds one can to the oil and it cleans them out nice.


Anyway you look at it you have a bit of a job in front of you. Check that oil passage if you end up opening the motor, when its clear you will see the oil come out in the lifter galley.



Side note brake the head bolts free by hand not impact, i have read several accounts of guys brake them off. Also put sealent on all the head bolts when you put it back together , they all go into the water jackets. Retorque when hot !