4010 jd valves sticking

[mt matt]

I have a4010 jd that has beenrecentlyoverhauled and thensat for several years. I seems as though maybe it is not getting enough oil to the valves, theysomtimes stick and then predictably it bend push rods,I have good oil pressure (30) lbs . Any thoughts?

 

[JD Dave]

You give us a complicated message here. When was it overhauled and how long has it sat? How did you measure the oil pressure? Tap in a manual pressure gauge and remove the valve cover. View the valve stems and rocker arms. There should be oil all over on everything. Keep on troubleshooting. If valve train is "dry", that could bend push rods. Also check ignition timing of a gas engine or injection pump timing of a diesel.

 

[mt matt]

it was overhauled about 6 years ago ran till the loader broke then sat about 4 years I bought it last year when I went to pick it up we put bateries in and it started right up. we loaded it and let it run for an hour then shut off to haul home 2 hrs. next morning I started it and it bent 4 push rods. 2 valves stuck so I oiled every thing up and got them unstuck put in new pushrods set the valves and it ran good. went to change the oil and had bearing chunks in the pan. i pulled the pan and fgured out that it had ate the thrust bearing. the thrust surface is not perfect but not rough so I installed a new thrust bearing and have put maybe 50 hrs on it with no trouble till the other day we were pulling a light disc with it and let it sit and Idle for a while then shut off. next day started right up and bent 2 push rods 2 valves on 1 cylinder were stuck, got them freed up and sraightened the pushrods and installed them it is oiling the valve train but not enough oil to splash all over when running.valvs were still sticking just a little so I put some SFR (superior friction reduction) in and let it run awhile and evenualy all the valve train noise went away,but when will it randomly sieze up some valves and bend pushrods again? So today I installed a manual gauge and have 37 lb oil press. cold and about 30 at opperating temp. diesel engine timing I belive to be good as it starts and runs like a top.

 

[JIM MN]

Good oil pressure. You may need to take off the whole rocker arm assembly and disassemble and clean, especially the metal tube- rocker arms and the lub holes.? Can try to use an upper-lub in the diesel fuel to lub the valve stems. On the old two-cylinder gas tractors we would just put in a quart of engine oil into a tank of gas? Go work the tractor. Helped keep the valves free.

 

[rustred]

You need to pull the head and remove the valves and clean the valve guides and stems. It could be carbon or rust in there from sitting. Them dip the valves in oil and reinstall them. Plus check the guide to stem clearance as whoever or if it was redone might have the clearances too tight. Need at least .002 min. After .004 I would say they are getting worn. Till u get them valves out and cleaned up it’s gonna keep happening. Plus who knows what oil has been used it and the valves are all coked up with oil inside and there’s your problem. Remove head time. And also with the valve cover off and at TDC on compression on each cyl. You should be able to wiggle the valve stem slightly. If not that again verifies they are too tight.

 

[wore out]

I have a4010 jd that has beenrecentlyoverhauled and thensat for several years. I seems as though maybe it is not getting enough oil to the valves, theysomtimes stick and then predictably it bend push rods,I have good oil pressure (30) lbs . Any thoughts?

I may have missed that you posted it, but gas or diesel?

If a cam bearing wasn't installed properly with the oil holes lined up there will be no oiling to the valve train.

 

[mt matt]

I may have missed that you posted it, but gas or diesel?

If a cam bearing wasn't installed properly with the oil holes lined up there will be no oiling to the valve train.

it is diesel I am getting some oil I just don't know if it is enough, how do i tell that?

 

[rustred]

it is diesel I am getting some oil I just don't know if it is enough, how do i tell that?

You will see the oil dripping when running . All valves should be getting oil.

 

[mt matt]

You need to pull the head and remove the valves and clean the valve guides and stems. It could be carbon or rust in there from sitting. Them dip the valves in oil and reinstall them. Plus check the guide to stem clearance as whoever or if it was redone might have the clearances too tight. Need at least .002 min. After .004 I would say they are getting worn. Till u get them valves out and cleaned up it’s gonna keep happening. Plus who knows what oil has been used it and the valves are all coked up with oil inside and there’s your problem. Remove head time. And also with the valve cover off and at TDC on compression on each cyl. You should be able to wiggle the valve stem slightly. If not that again verifies they are too tight.

will they wiggle with the sprigs in place ? are there different size valve guids available or are they all standard?

 

[mt matt]

You will see the oil dripping when running . All valves should be getting oil.

there is oil dripping off the rocker arms but not enough to spash all over.

 

[rustred]

will they wiggle with the sprigs in place ? are there different size valve guids available or are they all standard?

Yes you can feel and see the wiggle if you know what you’re looking for. Watch the valve stem. They are reamed to fit when installing the valves.

 

[rustred]

Don’t have to slash all over , as long as the oil is lubing the valve spring it will them make its way to the guide.

 

[wore out]

there is oil dripping off the rocker arms but not enough to spash all over.

Are the plugs in the front and back end of the hollow rocker arm shaft in place and not leaking?

IF so and there is a little oil dripping from the rockers from front to back that should be all that is needed.

 

[mt matt]

Ok I will do some more looking I blieve all that is right so maybe I will need to takeapart and clean will check for valve movement.

 

[rustred]

Ok I will do some more looking I blieve all that is right so maybe I will need to takeapart and clean will check for valve movement.

It appears this engine has been overhauled. Then not really worked mostly idled around. Maybe the rings did not seat yet and it pumping a bit of oil out which is coking the valves which is causing the problem. I know on a gas engine you can mist water into the intake to get rid of carbon at a high idle. So if you can’t feel any valve movement when the rockers are loose tear down is in the future. Wouldn’t hurt to throw a quart of 2 cycle oil in the fuel tank and see if that helps any before a tear down. And a good hard workout as that’s what a diesel engine is for , not idling around as a loader tractor.

 

[Geo-TH,In]

I have a4010 jd that has beenrecentlyoverhauled and thensat for several years. I seems as though maybe it is not getting enough oil to the valves, theysomtimes stick and then predictably it bend push rods,I have good oil pressure (30) lbs . Any thoughts?

My retired Jubilee had #4 exhaust valve stick open. I think the cause was I would start it and only run it for a few minutes. After 4 years the inside of the valve cover was full of condensation. My oil looked like rusty mud. I decided to buy another 6 ft mower and give it a workout no longer start for a few minutes.

 

[Fritz Maurer]

Something is missing from this story. I find it hard to believe that valves arbitrarily seize up in the middle of the night when cold, after the thing was running for a couple hours earlier that day and oiled everything up.

 

[matthies]

Take the rocker arm cover off, if there are cotter pins on the ends of the shaft, there are rubber plugs to stop the oil. But after all these years the rubber plugs can shrink and slide in, especially the rear in which it can block the oil hole or move past it dumping the oil right out the end of the shaft. And not oiling the rockers, shaft and valves. Had it happen to ours that even gets used daily.

 

[Fritz Maurer]

It appears this engine has been overhauled. Then not really worked mostly idled around. Maybe the rings did not seat yet and it pumping a bit of oil out which is coking the valves which is causing the problem. I know on a gas engine you can mist water into the intake to get rid of carbon at a high idle. So if you can’t feel any valve movement when the rockers are loose tear down is in the future. Wouldn’t hurt to throw a quart of 2 cycle oil in the fuel tank and see if that helps any before a tear down. And a good hard workout as that’s what a diesel engine is for , not idling around as a loader tractor.

What is the 2 cycle oil in the fuel tank supposed to do?

 

[Jim.ME]

What is the 2 cycle oil in the fuel tank supposed to do?

Add a bit of lube for the injection pump of his diesel, is the usual reason. It won't be the same as adding oil or Mystery Oil, etc. to a gas engine that pulls the fuel past the valves, to provide a bit of lube them. The valves will be closed when the fuel is injected in the diesel.