Thread: Borg Warner Achilles heal?

Which rangie was it from??


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I wonder if my adding teflon at various times and moly now will reduce that wear.
It is pretty clear that the lubricant fails in that area, so hopefully adding boundary lubricants will slow it down.
I also now change oil about every 20KK with TransmaxZ.
I also guess that VC failure would add a lot of stress there. My VC gets checked very regularly.
The bloody thing is treated like a baby.
Regards Philip A

Originally Posted by LOVEMYRANGIE

Which rangie was it from??


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That 1 in particular is from the 93 ....

I've also replaced the shaft on the 90 model ... I've seen this wear on 3 separate B/W boxes .... That single spline is the only thing giving drive to the front & rear diffs ...


To replace the shaft is fairly easy and not much heartache

Originally Posted by mike 90 RR

<snip>
This spline goes through the Centre diff .... It is sacrificial .... I had it fail in the middle of an intersection a while ago ..... <snip>

Mike

I didn't think the B/W boxes had a centre diff, only a viscous coupling.

Or are there more than one B/W transfer boxes?

On the subject of the spline, I guess that's why people are now retrofitting D1 LT230s in place of the B/W box.

Originally Posted by Lotz-A-Landies

Mike
I didn't think the B/W boxes had a centre diff, only a viscous coupling.

I have only replaced "whole" B/W boxes and taken off the front and rear output housings ... But hav'nt split a B/W casing yet .... I just doubled checked with the LR workshop manual ... And yep ... It has one

Don't ask me how it all functions tho ..

Originally Posted by Lotz-A-Landies

On the subject of the spline, I guess that's why people are now retrofitting D1 LT230s in place of the B/W box.

I have a parts D1 in my backyard for this purpose .... But now I'm thinking that I want to go import an Ashcroft unit and keep it original




.... So undecided ....

the viscous boxes are quieter than the LT230 and more Toorack Tractor driver proof.

Originally Posted by Lotz-A-Landies

Mike

I didn't think the B/W boxes had a centre diff, only a viscous coupling.

Or are there more than one B/W transfer boxes?

On the subject of the spline, I guess that's why people are now retrofitting D1 LT230s in place of the B/W box.

All transfer cases have a centre diff, they have to have them but the difference is the method of locking. In the case of the BW, the viscous coupling constantly splits torque 50/50 to frt & rr diffs and is technically constantly locked but allows for slipping when vehicle is turning a corner for example hence stopping transmission windup.
The viscous sits on place of where the normal mechanical difflock would sit in say an LT230.
This is the reason you get front tyre scrubbing when the viscous seizes as it loses it's ability to slip.

The BW viscous was only ever fitted to Range Rovers. All D1's and D2's for that matter have the LT230 box.

Biggest difference between the two is if you remove a driveshaft from both a viscous RRC and a fender or disco, you need to activate the difflock in the fender and disco to get any drive at all.
In a RRC there is no diff lock on the lever, just H N & L.

Cheers

Andrew





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Originally Posted by LOVEMYRANGIE

All transfer cases have a centre diff, they have to have them but the difference is the method of locking. In the case of the BW, the viscous coupling constantly splits torque 50/50 to frt & rr diffs and is technically constantly locked but allows for slipping when vehicle is turning a corner for example hence stopping transmission windup. <snip>!!

I guess it is in the definition of what makes a differential.

I was considering the LT230 as a diff because the device has a geared conection that can share the drive between front and rear 0%:100% through 50%:50% to 100%:0% just like an open diff on your axles. Which in the LT230 also has a lock.

I wasn't considering the viscous coupling as a diff because the there is no geared connection, other than the viscosity of the interface to the front axle that allows the front wheels to turn faster than the rear when cornering and it has no lock. The viscous coupling in the RRc is as much a diff as the freewheel unit on the 1948 to 1950 80" Land Rover was a diff.