Stuck Valve Super A

henhawk1969 · Aug 19, 2014

# one cylinder intake valve is stuck. Any remedies other than pulling the head off. The engine runs , just the valve does not move.

ken house · Aug 19, 2014

valve is stuck open?

ken house · Aug 19, 2014

i have to believe that valve is stuck open. remove side plate, spray with penetrating oil; remove spark plug, use hard wood dowel or screwdriver or some other and insert through spark plug hole onto the top of the valve and gently tap the dowel with a hammer. with good luck the valve will move. do not rush, take time, keep spraying with penetrant. turn engine over and repeat.

Anonymous-0 · Aug 19, 2014

An A has an overhead valve engine...so there's no side plate to remove to get to the valves.

My recommendation would be to remove the valve cover on the top of the engine, and rotate the engine until the #1 exhaust valve opens. That way, you know you won't hit the top of a piston. Then take a ball-pein hammer and gently tap on the intake valve, after spraying the valve stem area with a penetrating oil. Don't KILL it, just tap gently. If the spring isn't broken, and if it still has SOME springiness left in it, taking the valve past the point where the rocker stops will sometime cause the spring to "do its job" and return the valve to a closed position.

The problem comes in when the valve has already hit the piston and the valve stem has bent. THAT valve ain't coming "home," and you'll have to remove the head and replace the valve to fix it. But until you remove the valve cover, you'll never know what's going on there.

El Toro · Aug 19, 2014

I would pull the head to find out why its stuck.
It may be rust or carbon or both. Hal

old · Aug 19, 2014

What I do it fill that cylinder with ATF and move the crank shaft till you have a little ATF coming out of the carb air intake. Then pull the valve cover off and coat the open valve with ATF and let it soak a day or 2. Then after soaking try to rotate that valve and also pull up on it.

gene bender · Aug 19, 2014

The valve is stuck open correct. Remove the valve cover then you can use some spay of any kind on the stem. You should be able to gently pry it up go easy DO NOT TAP IT DOWN as there is a little hair type clip on the stem to keep it from dropping down. A little tapping and prying it should come back up. When you get it back up use a rubber type hammer and tap it a little then pry back up after a few times it should free up. That has worked for me on the same head you have. If you cant free it up you will need to remove the head. good luck.

henhawk1969 · Aug 19, 2014

It is the first valve back from the radiator. It has come loose from the rocker arm. You can put all the adjustment from the set screw in and it is still loose.

JakeBrakeIH · Aug 19, 2014

Same thing happened to my Farmall A after sitting. Took the valve cover off along with the rockers and soaked it with penetrating oil. I was able to hit the valve spring with a small rubber mallet on either side with my father trying to help the spring up with a flat head. Took a little but then popped right up. Worked it a little more then put it back together and good to go.

jeb2 · Aug 20, 2014

I remember reading a post where a stuck open valve was fixed by removing the spark plug, then feeding a short length of rope into the cylinder, making sure to leave enough rope to hang out of the spark plug hole to remove the rope when finished. Hand crank or slowly crank the engine to compress the rope against the open valve. You might have to go trial and error to get the correct length of rope in the cylinder to push the valve shut. I have never tried this but I thought it would be worth a try instead of removing the head.

mkirsch · Aug 20, 2014

(quoted from post at 11:52:55 08/19/14) It is the first valve back from the radiator. It has come loose from the rocker arm. You can put all the adjustment from the set screw in and it is still loose.

Adjusting the rocker arm is NOT the way to fix it!

Look more closely. Is the valve stuck, or is the spring broken?

If the spring is broken you can lift up on the valve with your fingers and it will come up. The spring will need to be replaced. It can be done with the head on the tractor if necessary.

If the valve is stuck, try some of the remedies that people have suggested already:

1. Use penetrating oil or ATF to lubricate the valve stem.
2. Gently pry up on the valve. GENTLY!!!
3. If/when it comes up, GENTLY tap down on it with some sort of non-marring hammer like a rubber mallet or deadblow or even a block of wood. GENTLY!!!

Jim Becker · Aug 20, 2014

(quoted from post at 02:45:46 08/20/14) . . . by removing the spark plug, then feeding a short length of rope into the cylinder, making sure to leave enough rope to hang out of the spark plug hole to remove the rope when finished. Hand crank or slowly crank the engine to compress the rope against the open valve. . . .

I think that method has a good (bad) chance of putting all the force at an edge of the valve. If the valve is more than slightly sticking, it is possible to bend the stem rather than move the valve. I wouldn't try it.

Stuck Valve Super A

henhawk1969

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ken house

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ken house

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Anonymous-0

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El Toro

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old

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gene bender

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henhawk1969

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JakeBrakeIH

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jeb2

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mkirsch

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Jim Becker

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