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D21

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brad

04-09-2002 09:08:25




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I have grown up around Olivers and I still like them about the best, but recently I have started being interested in the Allis Challmers. Especially the D21's. Could you please tell me what size engine is in these. Are the AC engines? Are the turbocharged? How much horsepower stock, and then turned up. I appreciate the info and someday want to buy a 21.




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The D-21 Kid

04-15-2002 22:36:11




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 Re: D21 in reply to brad, 04-09-2002 09:08:25  
My Dad bought a new D-21 in 1966. It was a powerhouse in that day. The local John Deere junkie challenged him to a tractor pull(24' toolbar in the field) The Chalmers could pull the toolbar from a standing start the "New" John Deere 5020 couldn't take off with the toolbar in the ground and couldn't pull it as fast. Of course the Chalmers needed piston rings every 700 hours! Gotta love a machine that was such a prize fighter.

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Phil Munson

04-12-2002 07:34:32




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 Re: D21 in reply to brad, 04-09-2002 09:08:25  
The D-21 has the AC 3400 non turbo and the series II has the AC 3500 turbo engine. If you want to seriously farm with it, consider the AC 220 as a substitute. The D-21 we had would blow the doors right off the cab of a souped up 200 HP IHC 1456, and our D-21 barely smoked. However, the D-21 was very weak in the final drives. If Pa or I ran it there was no problem. If we allowed one of the boys to run it, we could figure on working on the finals. The AC 220, and 210 (same chassis, a little less fuel) were 4 inches longer than the D-21 from having a heavier final built into the tractor. The D-21 was a sweet tractor, but had way too much fire in front of the flywheel.

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MADDOG

10-30-2002 12:18:59




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 Re: Re: D21 in reply to Phil Munson, 04-12-2002 07:34:32  
Phil, you are correct; but new technology has solved the problems that you remember on your
(old) D-21. One of my (2) D-21 Series II pulls 185 PTO Horsepower @ 3/4 throttle!!. I pull 10-18s plows AND a culti-mulcher, in heavy SOD ground; I've seen grown men who thought they had seen EVERY strong tractor around, go home crying
(especially the JD owners). I specialize in rebuilding piston turbocharged engines to better than original factory specs and then I run them on my CALIBRATED PTO dynomometer. I solved the lightweight D-21 finals problem by rebuilding and RETEMPERING the gears to my specs; I have one D-21
owner in the Salem (Oregon) area who pulls 205 PTO horsepower out of his D-21 SII; I rebuilt the engine for him 6 YEARS AGO; he's NEVER been beaten
in a formal tractor pull!!!

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Glenn(WV)

04-10-2002 06:17:37




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 Re: D21 in reply to brad, 04-09-2002 09:08:25  
Like Chris said, the Series I machines were non-turbo. They were rated at 117hp. The Series II had an updated engine with the turbo, and it was rated at 127hp. I've seen Series II machines turned up to almost 170hp, and I'm sure more is possible in the stock setup. I really like the D21s, too, and I hope to own one at some point!

From a show last summer:


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MADDOG

10-30-2002 12:32:43




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 Re: Re: D21 in reply to Glenn(WV), 04-10-2002 06:17:37  
Glenn; thanks for the kind (and very true) words on the AC D-21 SII. I know for a fact that a STOCK, factory D-21 3500 diesel engine can crank
out 275 PTO horsepower; because I was the mechanic
operating the PTO dynamometer;shortly therafter the D-21 twisted the PTO connecting shaft off the dyno; took me 3 months to rebuild it.I was going TOWARDS FULL throttle on the D-21 when the PTO C/shaft sheared, I was at 2100 RPM when the dyno read 275 hosepower. It takes more than just increasing the d/fuel to get these engine to make this kind of HP; most old, tired stockers will just come apart at the bottom end; I did it one time years ago; when I was younger and more stupid. I trashed the D-21 engine in the process because the crank broke and came out the side of the block sideways; good thing I was up in the tractor seat; crankshaft on a Seies II weighs 320 lbs w/flywheel!!!!

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chris

04-09-2002 17:51:38




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 Re: D21 in reply to brad, 04-09-2002 09:08:25  
the D21 early was non turbo later had a turbo all had an A.C.426 ci my 210 has an engine from a d21 mine is around 140 hp.stock was around 120
I believe the D21 was a little fancier than the 210 but the two tractors were similar ,mine weighs 12,750 . these are real strong,solid tractors



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