Hi to alls
Can somebody identify the type of Borg Warner gearbox from the photo below ?
This gearbox is mounted on Jaguar MK2 1962. There is N D1 D2 on the selector lever. There is an intermediate hold speed switch on the dashboard.


My best regards
Gérard

 

I gotta say DG250. Is reverse at the right end on the selector?

 

If you can locate the serial number which is on a small plate riveted to the side of the gear box it would help. The Auto gear box used by Jaguar on the Mk2 and S Type up until late 1967 was the DG250 and the serial number should begin with the letters JBC. After late 1967 they changed to the BW35 which was an alloy bodied gearbox where as the DG250 was a cast iron body I believe. In the same period Jaguar also used the older heavy duty Model 8 auto cast iron bodied gearbox on the 420 as the BW35 was not man enough to take the torque of the 4.2 engine.
So unless you have had a gearbox change your Mk2 should have the Borg Warner DG250.

 

It looks like the DG250 transmissions that I've seen.

 

simple:
if it has a working Speed Hold switch on the dash, it is a DG250.

 

GGJag is apparently new to MK2s and I will add a couple of pointers
It is definitely a DG250 auto box. The DG means Detroit Gear.
That round cylinder to the right of the box with a couple of wires coming out is the auto brake hold solenoid which stops creep if the brakes have been used to stop the car while the throttle is closed.
It automatically opens as soon as the throttle is opened.
When checking the oil level in a DG 250 auto box it is done with the engine running and Drive selected. You need to have someone keeping their foot on the brake.
DG 250 boxes are notorious for oil leaks. Itis easier and cheaper to buy a drip tray/pan than to fix the leaks.

 

Hi Bill Mac
You right, I am a Junior.
According Borg Warner specialist in reconditionning, the good news is most of the leaks can be fixed without removing the transmission.
Best Regards
Gérard
Junior Jag

 

Elimination of all oil leaks in a system with a lot of seals isn't easy. If the box isn't working well, which is quite likely if the car has been standing for a few weeks, it's worth seeing the effect of changing the fluid before rushing into a rebuild. To completely drain the old fluid you may have to open more than one drain plug as well as opening the sump. For example, the plug at the top left of your photo allows you to empty the rear extension box.

There's a question about what fluid to use. If Glyn were participating, he would explain why you should use a type F (or G) ATF (such as Castrol TQF) rather than Dexron. I'd rate Glyn's advice on fluids over that from any gearbox specialist.

Although it's an ancient design, the DG250 has some nice (advanced) features like top gear lock up and intermediate hold. There's a lot of info on Studebaker forums - I think Studebaker were the first customer and participated in the design. As a manufacturer that worried even less about weight than Jaguar, that might explain why the DG250 is not exactly easy to lift.

 

Peter.
another advanced feature of the DG250 is the ability to start the engine by pushing or pulling the car in Neutral, then when some speed is reached, shifting to 1st Gear or Drive might start the engine, just like any manual transmission would.
I've never heard of that in any other automatic transmission.

 

Jose, I didn't know that. It's usually something you're told not do as it might destroy the box. I wonder if it's possible with one of the modern transmissions that lock up in most gears - I'm not brave (or rich) enough to try it.

 

Peter,
it is in the factory service manual, transmission section.

 

Jose is correct
We did a tow start on a MK1 3.4 auto over 20 years ago.
Starter motor had failed, and it had a fair distance to go.
Worked OK.