43 A stuck intake valve

[Anonymous-0]

Intake valve is stuck open on left hand side. Tractor ran roughly after sitting out two years ago. Got it in the shed and it has sat for couple years. Have valve cover and rocker assembly off. Been tapping/hitting on stem with hammer and aluminum block with no results, thinking if I can get it to move forward the spring will push it back. Obviously don"t want to pull head if at all possible. Anyone with any experience at this? Anything I can fill cylinder up with that wont leak past the rings that would help me? Thanks for any replies.

 

[[email protected]]

I have heard of guys with aircraft and stuck valves using a soft nylon rope and feeding it into the cylinder through the plug hole and gently rolling over the engine to put a little tension on the valve to free it. This obviously will not work if the valve is going to hit the piston. You can try the ATF and turpentine method, just be careful what might end up in the crankcase. I surely would not beat on it with anything metal. Use something wood or just let it soak during teardown.

 

[Anonymous-0]

I assume you've been squirting penetrating oil down in where the guide is. I have read of but not personally tried this method of pushing a valve back. Feed clothsline sized rope into the spark plug hole until you have a pretty good sized wad of it in there. Keep the tag end out! Rock the piston forward pushing the rope against the valve maybe pushing it shut. Pull the rope out. I saw some pics of this in the EAA magazine being done on a small airplane engine.

 

[Machinery-Man]

I would take the spring off....place some sand paper around the stem then vice grip it tight and lubricate it maybe some heat around the head by stem slightly tape or jar the vice grips back and forth when free in that spot start working a little in and out with lubricant...the crud is what is hold tight...as you work back and forth flush off the stem....it works...be sure to wrap sand paper several times to cushion the teeth of the vice grips so there is no stem miring....

 

[Anonymous-0]

get some p.b. blaster or wd 40 squirt stem very good get a pair of vise grips put on stem, wiggle turn back and forth easy, use small hammer and tap the end of stem carful not to musroom it take your time it will start to work again slowly.been there done that. patients.

 

[Anonymous-0]

Been there, done that. Shoot some good penetrating oil on the valve stem and guide and let it soak in good. Then soak it a couple more times. Lightly tap the end of the rocker arm with a hammer so as not to dent or bend the metal. Slight taps. See if the spring will push it back. More oil. More slight taps. Eventually it will come bouncing back with every tap. Sometimes they are not stuck much ... especially if you allow for the penetrating oil to work. If water got into the cylinder then that is a different story. For sure you will have to pull the tappet assembly and try working with the valve stem tapping and turning as previously mentioned. The head may have to be removed to clean up the valve.

 

[Ben. So. Tex.]

I have in the past freed them up on an A and a 60 and a G. I took a pair of water pump pilers and grab the tip of the stuck vavle stem and gently try to roll it clock wise and then counter clock wise and they game free, Now your valve maybe stuck worse then the ones I unstuck. Keep shooting the oil to it.
Good Luck Ben

 

[johns48jdb]

why would you not want to tear it down and get to it where ou can work at it from bgotrh sides. anthing that is that bad off nedds taking apart and doing right. if its one of the ineer valves the tube arounjd it may have rusted into and you'll at least want to look at that for sure to see if its bad too. if you do the rope thing want you stand a chance on pushing that tube out any way

 

[LEH]

Pull the head off & do a valve job. If it's stuck that tight, chances are the seat is rusted too.

 

[Dave from Texas]

I have just redone my A's head. I could not find any new intake valves in the country. This site included. I found some good used ones. Don't mess up your valve. I have use a drill to spin valves with oil to help free them.