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Antique Farm Tractors Vintage farm tractors on rubber tires with various implements. Ford, John Deere, Oliver, McCormick and more.

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John Deere AR engine trouble


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Old 08-11-2019, 07:18:29 PM
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Jack Innes Jack Innes is offline
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Default John Deere AR engine trouble

I am jumping the gun a bit here; I just committed to buy a mid 40s unstyled JD AR that I have not seen in person. There is an engine problem - it has compression on one cylinder only & it will not turn completely over, there is a clunk when it stops turning. Any suggestions on what to look for? Optimistically I am thinking a dropped valve but it could be worse.
It is unknown if this happened running or not.

I hope to pick it up mid week & will know more then.

Thank you,
Jack
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Old 08-11-2019, 07:24:45 PM
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Default Re: John Deere AR engine trouble

I'd lift the crank case cover and look for connecting rod issues.
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Old 08-11-2019, 07:33:47 PM
David Hoover David Hoover is offline
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Default Re: John Deere AR engine trouble

Maybe just a stuck valve. Might be a pretty good tractor, just sat to long
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Old 08-11-2019, 08:24:41 PM
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Default Re: John Deere AR engine trouble

If it makes a sudden hard stop with a genuine clunk sound, it's hitting something that's striking the crank most likely. A stuck valve won't do that, it will simply turn so far and stiffen up without the clunk sound. Now if the valve has dropped and been sucked inside and hitting the piston, yes. The valve cannot hit anything if the keeper and spring is still in place. Either way it's simple enough to remove the covers to check.
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Old 08-13-2019, 10:24:57 AM
Wayne Riedlinger Wayne Riedlinger is offline
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Default Re: John Deere AR engine trouble

Those tractors are quite easy to open up to have a look inside.
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Old 08-13-2019, 07:48:03 PM
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Default Re: John Deere AR engine trouble

The AR came home today & I have opened it up to see where the trouble is. It turns better than 3/4 turn then seems to come to a spongey stop. It feels like you might pull it through but might break something. Both pistons are moving.
The valves are fine, the rods & mains are fine, the governor is free as is the fan shaft & magneto drive.
The only thing I can find is that the bolts holding the cam gear to the camshaft are finger tight & movable in their locks. Could this let the gear bind on something? Or could a camshaft roller bearing be piling up? If you turn the flywheel backwards there is a tinny clunking sound as something binds then lets go.

The last picture shows 2 threaded holes that I am guessing have a breather tube joining them. Is this just a tube or is there some sort of pcv valve in the line - I need to find that part.

Any ideas?

The ID plate reads "John Deere model A, Ser. No. 265081"

It seems like a solid machine owned by someone with a grease gun & stored inside all of its life. The rear tires are new & fresh, one wheel has some repairs & would be better replaced.
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Old 08-13-2019, 09:08:51 PM
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Default Re: John Deere AR engine trouble

Mouse nest or dirt dobbers in one of the cylinders? I assume you have checked to see if the valves aren't stuck. There is a breather pipe connected to the intake that is missing, no pcv in it.
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