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4020D deal or dud?

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Lee Smith

01-12-2002 08:47:30




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JD dealer has a 1971 4020Diesel, true hours unknown, synchro range, wide front, 1 remote. Also full weights front and back. Sheet metal and tires look good. Asking price $8500.00 They bought it knowing it had blow-by' Sales rep says they will be putting in a new sleeve kit and changing out the rods, and pins. They will not pull the motor but do the work in-frame so the seals will not be changed. Is this a good fix or just a bandaide to hide more serious problems? How effective will the sleeve job be? Wouldn't the valves also need a going over, considering if it has blow-by. Sounds like the tractor has seen some hard days. What else to look for? A good 4020 in South GA ususally goes $9,500 to $12,500. Just seems a bit fishy! Your thoughts and comments would be greatly appreciated.
Thanks Lee

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Bill from up north

01-13-2002 07:26:04




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 Re: 4020D deal or dud? in reply to Lee Smith, 01-12-2002 08:47:30  
Inframe is good enough.They can tell if needs a align bore by the way the mains are worn. Rod resizing is a good thing. Make sure they check the camshaft for lobe wear, install new rod bolts and inspect oil pump drive. If valve guides are within spec.,and they do the valves and seats, you should have a good workable machine. Best of luck--Bill



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kraig WY

01-12-2002 18:44:45




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 Re: 4020D deal or dud? in reply to Lee Smith, 01-12-2002 08:47:30  
Last summer I decided I needed something heavier then a Ford 850 because I use alot of large bales of hay. I found a 4020D with a Ford Loader. I thought I made a good deal but they wouldn't let it out of the dealership w/out putting it on a dino. Machanic said it had blow by. Wasn't putting out the HP it should. They told me they would completely rebuild it if I would pay half the cost of the parts (they ate the labor). I'm a happy camper. Got a '71 tractor with, in reality, a new engine. Should out last me. To make a long story short, let them rebuild it. You'll be better off in the long run.

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Ray

01-13-2002 09:46:32




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 Re: Re: 4020D deal or dud? in reply to kraig WY, 01-12-2002 18:44:45  
Dealers around here are charging $5000 for in frame overhaul,I'd find a local mechanic.



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Brokenwrench

01-12-2002 14:01:02




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 Re: 4020D deal or dud? in reply to Lee Smith, 01-12-2002 08:47:30  
An inframe would be the way to go if the crank checks ok. I would ask the dealer to do a valve job on the head while its off. Also before you buy, pull the hydraulic filter and check it. A small amount of brass and dirt is ok, but if you see a silvery looking paste in the filter stay away from the tractor. The silvery looking stuff is the result of worn out brakes (steel on steel), this gets into every valve housing, steering, diff.lock etc. and is next to impossible to flush out of the system. Many of the 20 series tractors I have worked on lately are starting to show signs of this, because they have wet brakes there is no notable increase in noise. This is another reason to change the hyd. filter(s) at every oil change. If you catch it soon enough, this will keep a 750. brake job from turning into a 3500. brake job.

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Tom

01-12-2002 12:24:35




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 Re: 4020D deal or dud? in reply to Lee Smith, 01-12-2002 08:47:30  
For someone who is just starting out in this hobby, could someone explain "blow-by" to me? A truly "green" JD fan,
Tom



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twopop

01-12-2002 16:32:18




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 Re: Re: 4020D deal or dud? in reply to Tom, 01-12-2002 12:24:35  
TOM,as already stated,blowby is compressed air mixed with some fuel and oil that leaks past the rings into the crankcase,where it builds up pressure again and is forced out of the road draft tube attached to the valve cover.it is not necessarily due to rings not sealing.as rings and cylinders wear,the end gaps of the rings widen and let compression pass.you dont see blowby on a automotive engine since the emission system recycles it into the intake manifold

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wendell, Mn

01-12-2002 13:44:39




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 Re: Re: 4020D deal or dud? in reply to Tom, 01-12-2002 12:24:35  
blowby is when sombody tells you what a really great deal he just made on a tractor that everybody is looking for and is in perfect condition, when in reality, it ain't ran in 20 years, he only paid half price because the owner already sold the hard to find stuff, and if you look real close at it, you'll notice it's not even a John Deere. otherwise it's the leekage of compression in the cylenders

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Clint

01-12-2002 13:05:25




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 Re: Re: 4020D deal or dud? in reply to Tom, 01-12-2002 12:24:35  
Fumes-air and fuel-getting by the piston rings into the crankcase compart.



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twopop

01-12-2002 11:13:38




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 Re: 4020D deal or dud? in reply to Lee Smith, 01-12-2002 08:47:30  
the dealer probably doesnt have more than 2to 3 thousand in it and can make his profit by overhauling it and then selling.blow by is more telling of rings than valves,but,a good shop will do a valve job when they do an in frame overhaul.the only differance between an in frame and a full over haul should be the rear main seal,jd has a very good rear seal and generally dont leak,no matter how old they are,

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Allen

01-12-2002 12:43:45




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 Re: Re: 4020D deal or dud? in reply to twopop, 01-12-2002 11:13:38  
we always pull the engine, should always send crank out to be checked, we sometimes send block also to be checked and do a line bore if real high hour engine, does not add much more to the cost of the overhaul. the job will be covered by a 1 year warranty, it in the best interest of the dealer to do the job the right way the first time.



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RickB.

01-13-2002 04:39:48




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 Re: Re: Re: 4020D deal or dud? in reply to Allen, 01-12-2002 12:43:45  
Your comment that an out-of-frame overhaul "does not add much more to the cost" is incorrect to the point of being foolish. Certainly, all the operations you suggest will result in a more complete overhaul. At today's shop rates, it will also cost substantially more than what is being proposed. A valve job, with particular attention paid to valve seat recession is definitely in order here.



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