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Stuck valves
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- 5+ Years
- Posts: 4
- Joined: Thu May 07, 2015 11:16 am
- Zip Code: 76108
- Tractors Owned: 1951 farmall cub
Stuck valves
How to fix stuck valves without tearing the motor down? It has been sitting for a few years.
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- Team Cub Mentor
- Posts: 20336
- Joined: Fri Jul 02, 2004 9:52 pm
- Zip Code: 65051
- Circle of Safety: Y
- Location: Mo. Linn
Re: Stuck valves
Hood off. Remove the spark plugs, squirt solvent into the valve(s) area. If the valve is open, try to get the solvent under the valve and on the valve stem.
Remove the valve cover. Squirt solvent on each valve stem. Wait a bit, the squirt again. Rotate the engine. Might want to try the solvent through the spark plug holes and on the valve stems for several days.
Roll the engine over by hand. Observe which valve are not closing. Usually stuck open.
If you can observe the edge of the stuck open valve, hard wood dowel, gently tap the valve down. Solvent. Rotate the engine observing valve action.
Another trick after the solvent soak. Place a .030" feeler gauge between the tappet and valve stem. Rotate the engine to lift the valve. Solvent, tap valve down.
If the above doesn't work you can remove the manifold and solvent soak the valve stems.
Edit. If the engine is stuck, probably better to remove from tractor and disassemble.
Remove the valve cover. Squirt solvent on each valve stem. Wait a bit, the squirt again. Rotate the engine. Might want to try the solvent through the spark plug holes and on the valve stems for several days.
Roll the engine over by hand. Observe which valve are not closing. Usually stuck open.
If you can observe the edge of the stuck open valve, hard wood dowel, gently tap the valve down. Solvent. Rotate the engine observing valve action.
Another trick after the solvent soak. Place a .030" feeler gauge between the tappet and valve stem. Rotate the engine to lift the valve. Solvent, tap valve down.
If the above doesn't work you can remove the manifold and solvent soak the valve stems.
Edit. If the engine is stuck, probably better to remove from tractor and disassemble.
I have an excuse. CRS.
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- 10+ Years
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Re: Stuck valves
If you determine which ones are open and will not move, you can use a needle nose vice grip pliers and hold the stem below the keeper, spray and wiggle the valve slightly. The spring should provide enough force to make it move closed. Keep repeating as Eugene said, tapping lightly through the spark plug hole. It might take a little while to free them up. The last one I had like this had been sitting without moving the engine for 30+ years. Stan
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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