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 | bodywash
Join Date: Apr 2004 Posts: 5 ohio 
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2004-11-12 100285
I am trying to replace an injector on my 84' JD 850. The old injector is proving impossible to pull out. I have tried threading a 6in bolt into the top of the injector and using it as a sort of slide hammer with a 5 lb weight. Still no luck. I am getting very frustrated. I would appreciate any and all suggestions. Also, I am not worried about saving the old injector - just need to get it out.
Thanks Scott
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| jdgreen
Join Date: Jul 2003 Posts: 232 Maryland
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2004-11-13 100311
I wish I had a magic answer for you , but I have had to resort to removing the cylinder head and driving it out with a big drift and hammer. This ruins the injector and the pre-combustion chamber cups in the process. The slide hammer idea works sometimes, but you are going to need longer than a six inch stroke. I use a OTC silver slapper slide hammer with a custom fabricated adapter to screw into the injector. This gives you a sixteen inch stroke with a five pound hammer weight. Soak it thoroughly with penetrating oil a couple of days ahead. If the engine is still runnable, You might run it and warm things up first to try and expand the cylinder head a little. I would not suggest using a torch to heat it for fear of warping the head. Good Luck! ....
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| karlprotocol
Join Date: Jul 2005 Posts: 2 Hammond, La
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2005-07-14 113455
I too am experiencing difficulty in removing the injectors on my 850. The machine shop just notified me that they were unable to remove them. I hate to buy another head knowing someone will eventually rebuild this one. Are there any remanufactured ones available and where. I'm new to John Deere tractors. ....
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 | kwschumm
Join Date: Feb 2003 Posts: 5764 NW Oregon 
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2005-07-14 113456
Often on bolts that are really stuck I use an air chisel with a blunt tip to vibrate the bolt and the surrounding metal. Soak it with penetrating oil for a day or two first. It almost always loosens things up. I've never done this on an injector, but it might be worth a try. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2005-07-14 113463
We use a combination of heat and cold ..... at the same time. So far it has broken the toughest ones loose.
Heat the whole area around the injector in the head as hot as you can get it with a torch, then use an upside down can of dust-off spray for electronics into the injector to instantly freeze the injector.
When you invert the can and spray you get a stream of the liquid, it is like like nitrogen or something.
When the head is that hot, and expanded, and you rapidly freeze just the injector, it usually shrinks enough, and the head doesn't, that it allows the injector to come loose.
Best of luck. ....
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 | oneace
Join Date: Mar 2004 Posts: 1490 south central pa 
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2005-07-15 113516
I use a slid hammer and fab a piece to screw on to the injector. ....
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| DennoAce
Join Date: Jan 2004 Posts: 105 usa
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2005-07-16 113536
have you tried melting candle wax in
may i also offer if doing just one, to do them all while you are at it? ....
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 | Chief
Join Date: Jul 2003 Posts: 4297 Southwest MiddleTennessee
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2005-07-16 113541
I like Murf's idea. We did something similar to that installing main rotor blade pitch change rod bearings. I take it that the machine shop attempt pushing out the injector using a hydraulic press? That puppy must really be stuck if they can't press it out! ....
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| karlprotocol
Join Date: Jul 2005 Posts: 2 Hammond, La
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2005-07-18 113604
Got the injectors out using murf's method but have 3 cracks in the old head. Anyone know where I can find a remanufactured head for a 1984-85 JD 850. ....
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| DennoAce
Join Date: Jan 2004 Posts: 105 usa
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2005-07-25 113886
I've only worked with heavy equipment for 20 years or so, but I always use the torch as a last resort on something of this nature. why? every time you heat metal to that degree it changes it/weakens it/distorts it.
Although liquid nitrogen works nicely to shrink when installing 4"+ bushings on large excavators....
ps not to sound negative..if it works for you guys, go for it!
:)
....
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