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  1. H

    Hydraulic question

    I'm having trouble with my hydraulics on my JD 2640 tractor. I had it laid up for a while working on the engine. I finally got the engine working great, but now I have a hydraulic issue. The 3-point goes up and down fine. The front end loader forks go up and down fine....it goes down a tad...
  2. H

    Replacing injector

    I have a JD 2640, 4 cyl. 276 diesel. We did a lot of work on it, including replacing the pencil-style injectors. According to the JD parts book the new injectors are supposed to have a washer and a seal ring on the bottom, going into the head. The seal has exactly the same outside diameter...
  3. H

    Adjust injector pump?

    We just rebuilt the 276 diesel engine on my 2640 tractor. We were very careful with everything and replaced anything that appeared to need replacing. We did not do anything with the injector pump other than to make sure it was installed correctly. We just started the engine after a...
  4. H

    Gator Carburetor Question

    I acquired an old gator.......it's 16 to 18 years old, about 1250 hours on the meter, which I think is legit, since I'm good friends with the owner. It won't start, and I took it to the local JD dealer. I have had two conversations with two separate service men from this dealer, both of which...
  5. H

    Reconnecting Engine

    OK, so my JD 2640 tractor with the 276 4-cyl engine needed rebuilding. So we split the tractor. While we were splitting it, it was very difficult to separate the engine from the back half of the tractor.......it came apart, but it was quite difficult to get it apart. We finally did, and rebuilt...
  6. H

    Wear ring on crank

    We are rebuilding my JD 276 engine that is on my 2640 tractor. On the end of the crank that goes to the flywheel, there is a ring.....it looks like a wear ring that goes next to the seal. It looks as if we should replace it, but I'm not finding the exact part on the online JD parts list. Any...
  7. H

    Main Bearing Bolts

    We are doing a total rebuild of my JD engine. I have bought new bolts for the head and for the rod bearing caps. My question is what is the risk of re-using the bolts for the main bearings? The engine did not have a lot of wear.
  8. H

    Splitting Tractor question

    We are splitting my John Deere 2640. Everything was going along OK until we got to the point of actually separating the engine from the transmission. We had the rear blocked up and was trying to remove the engine with a hoist, and the engine would not move forward and disengage from the trans...
  9. H

    276 Engine

    I have a 2640 with the 276 engine. I am looking for a new block and found one. For those of you in the know, are all the 276 blocks the same? I would think so, but I'm just trying to be sure before I buy it.
  10. H

    Crack in Engine Block

    I am rebuilding my JD 2640 that has the 276 diesel engine. I was getting coolant in my oil. I was thinking the problem was failed O rings on the bottoms of the wet sleeves. Today I pulled the sleeves and the top O rings were pretty nasty looking........pitted and crudded up and not good looking...
  11. H

    Engine Rebuild - Parts Question

    I am doing an inframe rebuild on my JD 2640. I've sent the head to a machine shop and they did a valve job.....I used plastigauge on the rod bearings and they're all in good shape.....all within tolerances. I'm ready to buy my engine kit. Is there any benefit in getting the engine kit directly...
  12. H

    Bearing Question

    I'm doing an inframe rebuild of a John Deere 2640. Today I removed the rod bearings and checked them with plastigauge. The book says the gap on the rod bearings is supposed to be between 0.0015 and 0.0045. Most of mine were showing near 0.002, with none more than 0.003. Some of the bearings...
  13. H

    Engine rebuild question

    I'm replacing the wet sleeves on my John Deere 2640. I'm fairly mechanical but have not done this particular job before and I'm seeking advice. I pulled the head. it looks to me like it needs cleaning as at least one exhaust port has a fair amount of carbon built up in it. The sleeves blew an...
  14. H

    Coolant in crankcase

    I have a JD 2640, 4100 hours on it. It was losing coolant and starting to get hot. I checked the oil and it had emulsified big time. I pulled the oil pan and saw pure green coolant dripping from the main bearings. Is the only thing that could cause this a cracked block? Could it be a head...
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