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John Deere Tractors Discussion Forum
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4010 Deere rocker problem

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BRS

06-27-2005 16:34:27




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We have the cylinder head off of our 4010 John Deere and we have noticed that the valve guides are worn out. The problem that we seem to have is the rocker arms are to short by about an 1/8", and are not pushing on the center of the valves, so the valve is being forced forward as its being opened by the rockers. We have a R34990R head and AR26445R and AR26446R rockers and according to our local Deere dealer these are the right rocker arms for the cylinder head we have. Is our dealer right or is there another rocker arm that will fix our geometry problem?? We don"t want to put it back together until we get this mystery solved. Thanks for you help guys.

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twopop

06-28-2005 15:57:11




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 Re: 4010 Deere rocker problem in reply to BRS, 06-27-2005 16:34:27  
i dont have my book with me and cant remember, most 404 engines used valve caps on the stems.if the 4010 should have them and they are not there the valvs would be too short,with the caps the valve length would be raised about 1/8 of an inch



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hogman_2002

06-27-2005 21:10:16




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 Re: 4010 Deere rocker problem in reply to BRS, 06-27-2005 16:34:27  
Are the tips of the rocker arms where they contact the valve wore? When the valve is in the closed position, the rocker arm should be contacting the valve in about the center of the rocker arm face. When the valve opens, the rocker arm will rotate and be contacting the valve on the outer edge of the rocker arm face.



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BRS

06-28-2005 08:03:10




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 Re: 4010 Deere rocker problem in reply to hogman_2002, 06-27-2005 21:10:16  
The rockers are in very good shape, almost as if they were change before we bought the tractor, and at the point the rockers touch the valve tips they hit dead center of the rocker pad. But if you were to divide the valve tip down the center the rocker arm pads hit in the middle of the back half of the valve tip almost to the point that at full lift the pad of the rocker is on the very edge of the valve tip if not completely falling off the back side if the correct valve lash is used. What do you guys think???

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Mike M

06-28-2005 09:28:58




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 Re: 4010 Deere rocker problem in reply to BRS, 06-28-2005 08:03:10  
I think your valve guide wear is directly related to the fact that a 4010 is over 40 years old !



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BRS

06-28-2005 15:38:45




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 Re: 4010 Deere rocker problem in reply to Mike M, 06-28-2005 09:28:58  
The head was just redone shortly before we bought it last October. The head was done by the same engine guy we use and as a matter a fact I remember the head in the machine have the works done to it, new valves, new guides, new seats, new springs, new locks, and retainers. There is even some porting done on it too. The valve length cannot be changed either, because a change of either shorter or longer will make the problem worse so the valve is right where it needs to be and the only answer we can come up with for wearing out the guides so fast is that the rocker arm is not centered over the valve. We"ve also talked to the previous owner and he remembers having the rockers arms and shaft changed a while ago and then he complained that the engine would smoke on start up and found the guides wiped out thats why the head work was done when he had it. We have worked on many, many engines over our life time and have not encountered an engine that purposelly runs the rockers off center on the valve and cannot explain why this one is like this. We have tried evey Deere rocker arm that Deere makes and most of them make the problem even worse. Would it be possible that Deere subbed the original part number to this other rocker and didn"t notice there was a length difference??? Thanks again guys.

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Mike M

06-29-2005 05:24:34




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 Re: 4010 Deere rocker problem in reply to BRS, 06-28-2005 15:38:45  
You might try finding some original rocker arms at a salvage yard or another cyl. head.



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