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Got inside my 4020D and found...

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Ted K

03-16-2003 14:32:15




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As I was pulling the sleeves on my 4020,and was cleaning out the "O" ring grooves (this is an early 4020D) I discovered that the bottom o-ring on #4 sleeve had a little dip downward in it. Looked at the groove and there is a section of the lower lip of the bottom groove missing, about a 1/2" long chunk, directly opposite the weep hole. Evidently the sleeve pushed the o-ring down in that section when it was installed. That would explain why there was sometimes a bit of oil coming out the weep hole. We have run the tractor for many years and just this winter there was a bit of anti-freeze seeping from the front weep hole. So decided to put in sleeves/pistons and bearings in-frame and found this. It must not have been causing a problem, but I was wondering if it would be better to put an extra o-ring into the weep hole groove just for extra sealing. Being that the section broken out is on the right side of the engine, I will be able to push the o-ring up where it is supposed to be from underneath, but it'll probably not stay in place anyway. What do you think about an o-ring in the weep hole groove? Also, I still have one sleeve to get loose. I have the sleeve puller on it now as tight as I care to tighten it, and am spraying WD-40 around the bottom of the sleeve from the water holes in the top of the block and from the sides. If this doesn't pop it loose, any other suggestions? Thanks, Ted

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Hoosier

03-18-2003 19:36:51




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 Re: Got inside my 4020D and found... in reply to Ted K, 03-16-2003 14:32:15  
The poeple at JD told me to put a o-ring in all grooves when I rebuilt a 4020 couple years ago. Just my 2-cents.



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Ted K

03-17-2003 07:00:22




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 Re: Got inside my 4020D and found... in reply to Ted K, 03-16-2003 14:32:15  
Thanks for the input on this matter. The sleeve was up enough this AM that I could finish pulling it out and everything looks OK there.
As for the broken out section of the lower groove, I wonder if a piece of spring wire set in all the way around the groove would "bridge" that little gap enough to hold the ring in until the sleeve was seated.(?) Oh,by the way, whoever put this engine together last had the square shaped o-rings in the top groove, and the red round ones in the bottom on all cylinders. That's ass-backwards isn't it? Maybe the square shaped one wouldn't 'roll' out as easily as the round one did. Thanks again guys, any more info will be greatly appreciated. Ted K

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JDJIM

03-16-2003 16:46:29




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 Re: Got inside my 4020D and found... in reply to Ted K, 03-16-2003 14:32:15  
Nieghbor had a similar problem many years ago , he was a "sledge hammer mechanic" you know what I mean . We were going to overhaul his 4020 , he couldn't wait for me to get there with he proper sleeve pulling tools . He decieded to use a jack and some kind of block he said to push out the sleeves . Somehow in the process he pushed up too far and when the sleeve broke loose the block , I think he used some kind of bar or pipe , broke chunks out of the bottom groove , and on four or five of them if I remember right . We cleaned everything good and put bottom o-ring if the middle groove thus plugging the weep hole but we didn't have a choice . Ran that way for a few years and then he traded it .
As for hard pulling sleeves , I went to pull the sleeves on the 4020 I have now and they were really tight . Finally when I got them pulled , by the way I used the propper pulling tools , I found the o-rings and sleeves were coated with that old black permatex stuff , you know what I'm talking about , what a time I had cleaning all that out of the grooves .

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G-MAN

03-16-2003 15:35:15




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 Re: Got inside my 4020D and found... in reply to Ted K, 03-16-2003 14:32:15  
That's kind of a tough call. If you don't mind the ocassional bit of oil coming out of the weep hole, you could just leave it the way it is and not put an o-ring in the weep-hole groove. You could probably smear some silicone around the area where it's pushed out and keep it from leaking. I don't know how snugly an o-ring will fit in the weep-hole groove anyway, but it may be worth a try. Use one of the black (lower) o-rings if you do it, as they are designed to tolerate oil. The uppers are only designed for coolant. You might also be able to do a little repairing of the groove with JB-weld or other two-part epoxy - enough to hold the o-ring correctly. Just make sure to use plenty of JD liner soap on the o-rings and seal surface on the sleeves when reinstalling them. Murphy's Oil Soap works just as well. As far as the sleeve goes, I would keep pressure on it and keep soaking it. You might try putting a board against the bottom and giving it a couple of good whacks. I've never had a sleeve come out that hard. Something else to consider would be heating the sleeve up some around the bottom where it seals in the block, as that's likely what's hanging it up. Apply some heat (not red-hot, but enough that you know it's doing some good) and then let it cool thoroughly. I'll be it will work loose for you, if you keep tension applied to it. JD blocks are pretty stout, so you can put a lot of pressure on them without worrying about damaging them. Just make sure your puller feet are resting on a sturdy area of the block.

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