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stuck push rods

W

William Ransom

Member
Just before I started asking about how to install the generator belt, I bought a starter and put it on the Farmall M. The starter cranks the engine all right, but I noticed that cranking the engine didn't seem to blow any air out the smokestack, and also closing the choke didn't affect the sound any. (I would expect that with the choke closed, the air going through the narrow openings in the carburetor would make a noticeable sound. I know it did when I closed the choke while coast-starting the tractor in 2004-2006.) Also, when I went to time the magneto after filing the points, I couldn't feel any air coming out the spark plug hole, so I couldn't tell whether it was on the compression or exhaust stroke. Because of all this, I thought there was likely some kind of problem with the valves, so I took the valve cover off. When I took the valve cover off, I found that all but one of the push rods seem to be stuck up, holding the valves open. Only one valve opened and closed as I turned the fan. Do you have any suggestions for how to get them unstuck?
 
are you sure? i have never seen the cam followers stick, and it sure cant be the pushrods stuck. most likely cause would be the valves stuck in the guides. and they would not all be stuck open unless it was cranked over and stuck open from major rust in there. when your cranking it are the pushrods goin up and down? with the starter you would also notice the engine free wheelin, not crankin as it should.
 
Your lifters must be stuck up holding the valves open. You are going to have to get them loose. Beter take all spark plugs out til you get the lifters opening and closing the valves or it just aint going to start . Squirt some wd-40 on em and get a rubber hammer to tap the rocker so they will close. There isnt any way the push rods are sticking unless there is a ton of junk in each hole where they are.
 
Your lifters must be stuck up holding the valves open. You are going to have to get them loose. Beter take all spark plugs out til you get the lifters opening and closing the valves or it just aint going to start . Squirt some wd-40 on em and get a rubber hammer to tap the rocker so they will close. There isnt any way the push rods are sticking unless there is a ton of junk in each hole where they are.
 
My bet is on stuck valves. Pull the valve cover, and crank it over and see if all the valves go back up. If the rocker's move, but the valves don't, that be your problem. IF the rocker's don't move, then you have a busted cam gear.

If the lifters are stuck, there will be alot more wrong with this engine than just no compression. If it is sludged up (or rusted) inside enough to make the lifter's hang, then the whole engine should be taken apart to search for other "nasty's" inside....................

as always, IMHO.
 
I thought it might be the cam followers that were stuck. I looked at the rocker arms and push rods and I saw that only one (the front one for the #3 cylinder) was moving. The rest of the valves were staying open, and the push rods were staying up.
 
Gene is correct. All other situations will allow the pushrods to fall out of position. I have seen it happen such that they had to be hammered out with the cam removed. If they didn"t break the cam when it was turned over, they can probably be "fixed" by using good penetrating oil down the pushrod holes, about a tablespoon each, then tapping them back downwith a plastic faced hammer. Remember that some of them will be held up by the cam, so they must be tapped in the order of the valve adjust rotational sequence. Jim
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 
I have pulled a lot of tractors out of the fence row with the motors stuck for years and Ive never seen the lifters stick always the valves or rocker arms

jimmy
 

Which push rod was moving? Was it the closest to the front of the engine?

I've never heard of cam followers all sticking up. Try tapping the push rods down one by one. I agree with some of the other poster about this being the valves stuck in the guides or the rocker arms being stuck in place.
 
well this is the first even hearing about something like this. the cyls would be rusted before something like this. you have oil sitting in the tappet concave . something just makes no sense here. the valves will stick way before the tappets.there must be very close tolerences and no wear for this to happen. sounds like an april fools joke to me.they all cant get stuck open from sitting either! they would have stuck while cranking. if this is the case then it is very easy to fix , just dump some lube in and tap them down.why didnt you try that?
 
The cheapest test: Remove valve cover. Remove rocker assembly. Remove push rods (make holes in board and install in order front to rear the push rods. Never,never pound on push rods). Apply Kroil oil or other penetrating on valves and springs and down the push rod holes. Very lightly tap the end of the valves with soft instrument. You will be able to tell if the valves are free by sound and feel. With spark plugs removed try to turn the engine by hand if the valves are all free and level. No piston damage can occur as all valves should be up. This should free the lifters if they are down. Reinstall the push rods and rocker assembly, with set screws in full up position. Then set valve lash. As you do this you will apply a steady down pressure on lifters. If a lifter is stuck up it will be apparent. Total cost=cover gasket. Total time about forty five minutes.
 
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