Servicing a T-28 Transmission / Borg Warner Model 8 Transmission

Thank you for your patience. I finally got all the pics back into the thread.
I still have the Travelall, but don't get to drive it as much as it deserves.
Happy New Year
 
Hello everyone,

I also have the BorgWarner Model 8 transmission in my 1967 Travelall,

because I had to disassemble it for cleaning (the car had been sitting for over 30 years).

Unfortunately, there isn't much information about this transmission here in Germany, except for Mercedes, Jaguar, and Volvo, which also used this transmission in the 1960s.

I'm glad this report is available. Many thanks to the author.

I now have a problem:

The transmission is installed and it works fine so far. Drive (D), D1, D2, and L turn, but my reverse gear is missing.

Can anyone tell me what the problem might be?

Since no one here could tell me exactly which ATF is the right one, I was recommended ATF Dexron 3.

Is that suitable or not?

Greetings from Germany
 
That binder has beautiful patina. I can't imagine what it's like to drive that thing around Germany! I sold my '66 about 18 months ago and miss tooling around on it.
As far as the questions, I'll leave that to the pros, but I believe that is the ATF I used.
 
Beluga said:
That binder has beautiful patina. I can't imagine what it's like to drive that thing around Germany! I sold my '66 about 18 months ago and miss tooling around on it.
As far as the questions, I'll leave that to the pros, but I believe that is the ATF I used.
Click to expand...
Hi Beluga, thanks for your reply.

It will definitely stand out on German roads. As far as I know, it's one of only four Scouts in Germany, and while there are more pickups here, Travelalls are absolute rarities.

So, if I understand you correctly, you also used Dexron 3 back then?

So my problem can't be the oil.
 
Dexron III ATF is fine. I'm going to relay some troubleshooting tips from the factory service manual. Keep in mind that these manuals were originally intended for factory trained service techs of the day, rather than untrained owner/enthusiasts decades later.

NO DRIVE IN R POSITION
1. Fluid level low....verify correct level.
2. Manual linkage not adjusted properly....verify and correct as needed.
3. Control pressure low.....assure both control valve assembly and pressure regulator valve assembly are clean. Adjust with vacuum unit setting.
4. Rear clutch not applying....check rear clutch action with air pressure.
5. Rear band will not apply.....check rear servo action with air pressure.
6. Transition valve stuck....clean control valve assembly.
 
Hi Scoutboy,

Thank you so much for your reply.

Does the service manual happen to explain how and where to adjust the compressed air?

Does adjusting the vacuum refer to the modulator that needs adjusting?

I'm definitely no expert, let alone a mechanic, but I always want to know and understand how things work, and the only way to do that is by trying to repair it myself.

Best regards from Germany
 
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Automatic transmissions are essentially hydraulic pumps. When the units are out of the vehicle and sitting on a service bench for inspection or repair, obviously there's no way for the engine driven pump to generate hydraulic pressure. That's where compressed air regulated down to a safe PSI can be used to mimic hydraulic pressure. By directing compressed air into various ports and passageways inside the trans, the actuation of servos, bands, clutch packs etc can be checked for proper function. This is not something that is generally done while the unit is in the vehicle, and certainly not without draining the fluid first. I'm not an auto transmission repair tech either. I have successfully rebuilt a few Torqueflite 727 transmissions in the past, but I'm not at all familiar with these Borg Warner units. They're a different animal.
 
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