To4b80 Turbo questions
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Category: Allis Chalmers
Forum Name: Farm Equipment -Knowledge Base
Forum Description: Long term storage of technical article, etc
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=200377
Printed Date: 01 Jun 2025 at 12:20am
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Topic: To4b80 Turbo questions
Posted By: studer automotive
Subject: To4b80 Turbo questions
Date Posted: 18 Mar 2024 at 3:07pm
I’m looking for a PN for a replacement to4b80. I came up with a 313099 PN off a borg Warner turbo , which replaced a tob490, which I believe is a replacement turbo for a d21 or 210/220. Im installing it on a d19 D so that’s entirely to big. Anybody have any input on this?
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a-c 185-d y/r cab turbo soon
99 f-250 7.3 4x4
86 mustang5.0 owned since 8/93
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Replies:
Posted By: DrAllis
Date Posted: 18 Mar 2024 at 9:57pm
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It's been 45 years, but I'm pretty sure the D-21 and D-19 used the SAME turbo, which was a Thompson brand which later became a Rajay. I always thought that was interesting, but that D-262 couldn't stand much boost and the bigger size was just what it took to keep boost relatively low.
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Posted By: studer automotive
Date Posted: 18 Mar 2024 at 10:59pm
Interesting, I have a ray-junk turbo on my 19 now i’m looking to replace it with a b-w or garret. I found brand new borg Warner turbos for $450-$500. Thanks for the info dr.
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a-c 185-d y/r cab turbo soon
99 f-250 7.3 4x4
86 mustang5.0 owned since 8/93
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Posted By: tbran
Date Posted: 01 Feb 2025 at 9:09am
TO4B80's came with 2 different exhaust housings. The D19,190,200 all used the .69 A/R housing. The 7020 and some combines and industrial (gen sets) used the .58 A/R housing for about 2#'s more boost or the same boost at lower RPM. The TO4 B90's were used on the 426 engines up to the 8000 series. They used 2 housings as well. Some combines, industrials, used the smaller .8 A/R but most had the .96 A/R housing. The smaller A/R housings forced more air to the turbine and spun it faster for more boost. The larger A/R's allowed some gases to escape around the turbine. The A/R # is usually stamped in the exhaust housing inside or on the radius. (some of the later China, perhaps, castings have no stampings)
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: studer automotive
Date Posted: 01 Feb 2025 at 12:20pm
Good info!!! Thanks
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a-c 185-d y/r cab turbo soon
99 f-250 7.3 4x4
86 mustang5.0 owned since 8/93
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Posted By: DMiller
Date Posted: 19 Feb 2025 at 9:32am
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The Turbo I finally found to fit my old 7G was on ALL STATES AG PARTS, contacted Air Research(Garrett) and confirmed would function as a replacement, most of these were Altitude Compensators NOT High boost Super Charging turbos, just meant to clean up Combustion.
This what looking for? https://www.tractorpartsasap.com/turbocharger-new-allis-chalmers-74008894-100543.html?gad_source=1&gclid=CjwKCAiAn9a9BhBtEiwAbKg6frYurmXpg2TKAj8R5VfGxLCb6bp6GkmU2_DXsEQecbOCVWbYyOxl9BoC0A4QAvD_BwE" rel="nofollow - Turbocharger fits Allis Chalmers D17 D19 D21 190 190XT 200 7000 7010 7020 8010 545B 545B 74008894 74024238 fits Gleaner L L2 L3 M2 M3 74024238
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Posted By: DrAllis
Date Posted: 20 Feb 2025 at 8:20am
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Another great example of the after-market world claiming that one turbo belongs on all those different machines. To start with, a D-17 never had a turbo. This turbo would be a replacement for an Air-Research brand, not an old Thompson or Rajay (D-21 for example) or some others that had Rajay OR Air Reasearch offered. You can't replace one brand turbo with another brand turbo and not make many plumbing changes. I'd say it is probably a 301 sized turbo, not a 426.
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Posted By: DMiller
Date Posted: 26 Feb 2025 at 6:45am
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Sorry Doc, but swapped many a brand of Turbo on Cummins Detroit and other engines as the OEM Manufacturers disappeared, So long as Volute Housings were produced to the old Specs any physical differences in appearance made no difference. Biggest issues in swaps were generally Plumbing for Oil Feed and Return, or re-clocking housings. Boost off the replacements was only limited as to discharge volumes based of Fuel consumption on the engines, generally they ran cleaner than the last units coming off had been.
Newer Turbochargers have developed to Roller Bearings rather than the old style Floating Bushings designs, accept oil SLOWER, requires a decent pressure available as well volume, and do not have as much issue with roll down damage with no oil as the older units once saw upon engine shut downs.
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Posted By: DrAllis
Date Posted: 26 Feb 2025 at 7:14am
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For example, if you try and swap and Air Research turbo for a Rajay brand turbo on a model 7000 tractor....everything is different. The cross-over pipe, oil feed line, oil drain line and in the case of a 190XT or 200, even the J-tube/air inlet is a different length. The only thing the same is the exhaust manifold and intake manifold. A Rajay is physically 1 to 1 1/2" shorter front to back, so everything is positioned differently.
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Posted By: DMiller
Date Posted: 27 Feb 2025 at 8:08am
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Position differences are manageable if cannot attain a antique that has not been built for thirty years.
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Posted By: tbran
Date Posted: 03 Mar 2025 at 3:54pm
The last Allis built was 40 years ago - the D19 60 years -- hard to believe...
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When told "it's not the money,it's the principle", remember, it's always the money..
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Posted By: studer automotive
Date Posted: 28 May 2025 at 11:55am
Back on this topic, but looking for a P/N for the smaller A/R exhaust housing….. TIA
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a-c 185-d y/r cab turbo soon
99 f-250 7.3 4x4
86 mustang5.0 owned since 8/93
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Posted By: DrAllis
Date Posted: 28 May 2025 at 1:06pm
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Find yourself a turbo 301 engine that is a gen-set engine. If it is new enough to have the TO-4 series Air-Research, it should be the tighter .58 exhaust housing, because it only runs 1800 RPM to make electricity.
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