John Deere 8850 little water

John Deere 8850 problem oil Problems

You may have to replace the head joint in an John Deere 8850. It has a few hours in a reconstruction, but it is losing a little water on the outer side I have not seen yet. If I can not find a manual, is there someone who can tell me the tightening torque of the cylinder head screws, how to adjust the valves and anything else that you have to do especially?


The engines in these tractors often had cylinder head joints because the engine is part of the tractor frame. This causes the engine to twist over time and it is much worse if the tractor has a taping blade on it. Make sure that the head and block are reviewed to check your plan and do not be sealed in the long term. I have the technical manual of John Deere for an 8630 that used the same engine. The cylinder head screws were tightened at 140 to 160 feet-pound, then 175 to 180 and after shooting at 205-215 feet-pound. The set of intake valves is 0.013 to 0.017 and 0.023 to 0.027 in the exhaust. Height of the shirt on the used block .000 to .004 in.

I have heard about the engine problem, if the 8850 had the same engine, why did not I have this problem or was a different tractor with the same engine? Thanks for the info.

You can be thinking about the V8 engine of tractor 8850. He did not endure well in the agricultural tractor but in the John Deere payment loader worked without problems for many thousands of hours. Many of the 8430 8630 8440 8640 8450 8650 8850 have had problems with the cylinder head joints. They are expensive to arrange due to the workforce to do a clutch job that has to disassemble much of the tractor.

I thought that these large JD engines always have water leaks in the meetings …
I have seen many jd leaking engines (8, 10, 13 ltrs) at forage choppers and many of them have leaks at the cylinder head joints that are sweating towards the outside.

I would suggest buying a service manual (which are not so expensive on a DVD directly from JD) or simply checking the Web, there may be some around.
And this manual will cover the entire tractor so it could be useful when you will have something else with the JD.
Put the valves a bit tier (0.05mm) than suggested, and then readjust them after 50 hours (if it is easy to get to the valves) this way you will know that you have not tightened the valves too when the head of the head is Compress the first hours.
It’s all a job but it’s good to do it: thumbsup

We had a hail storm that crushed part of the wheat in mid-July 1987. Insurance against hail canceled it, but what to do with it? This was when the Roundup was still above $ 20 / liter and there were very few height sprays, almost all were trawl sprayers. The only option was to discard it. Dad decided that the time had come to get into the “Great” tractor. I thought I was in the sky by pulling a record from Rome of 12 ‘to 3Mph around that field. Then, 2-3 weeks later, I went over at an angle. A month after that, everything had rotten enough to be able to pass a plow of chisel.

One day, Dad went out to tear him and the shock absorber fell when he hit the start. A more detailed inspection showed that the crankshaft had been cut between the shock absorber and the front bearing. The dealer dismantled it to estimate and repair. Dad finished changing her before the repairs were made by a JD 8760.

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