BMW/Titan LSD Viability

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ScottR400D
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It doesn’t matter how you measure torque if there isn’t any........

Nigel B
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That was what I found. There was no preload left to measure!

Geoff Brown
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On the subject of which oil to use in the BMW LSD - CC/Titan recommend a 75w140 which I had in my sorry looking LSD. But if one talks to SPC or R&R they recommend a good SAE 90 GL5. In fact R&R produce their own oil to this spec.  

When I get my diff back from SPC I intend to install Castrol B373 SAE 90. It is specified as a GL6 but this standard is no longer recognised as GL5 is the adopted highest standard (allegedly).  So the diff should receive all the benefits of a GL5 +.

I think the watchword is irrespective of cost, mileage or use change the oil annually & check the colour.  That goes for ALL  LSDs but especially Titan!

The number of owners innocently driving around with their Titan merrily on it way to destruction or causing the whole diff to implode must be immeasurable. With all the background noises attributed to driving a Seven it can be difficult to know when the diff is trying to tell you something. Fortunately mine 'spoke to me' with noises I could not ignore catching it just in time.

It is just a shame that CC neglected to inform owners at point of sale or in the Owners Handbook the service requirement for such a delicate piece of equipment.

Could we as owners possibly compile the number of Titan problems/failures?  Date, car model year, type of diff (BMW or Ford) & failure outcome. I don't mind taking this on board. So either PM me or use my club in box.

Wrightpayne
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Is there a drain plug on the bmw item? Not one on the ford diff. I had to use my machine mart oil syringe to evacuate the old oil

ScottR400D
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No, there’s no drain plug but it is relatively straightforward to suck all but 50/100ml our with a Pela or similar. 

 

 

Geoff Brown
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But that very last amount of oil could contain some or all of the fallout.  That is why it is worth considering a magnetic plug. But the overall colour of the removed oil will warn of something going on.

I can never understand why a drain plug is not included as at some time the oil will need to be changed.

ScottR400D
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My guess as to why there’s no drain is that both diffs are originally from road cars, probably never had plate LSDs and wouldn’t need regular oil changes. The cost of putting in a drain plug may be small but when multiplied by many thousands it adds up for a manufacturer. 

As to why CC never put one low down on their back plate I can only assume they also thought they wouldn’t need oil changes, or felt the back plate would be off often enough in any case  

I would have thought the mag plug, even at fill level, would pick up any bits likely to cause damage though there’s always the risk of something being left in there even with a drain. The only sure way is to remove the back plate altogether. 

Edited to add: having had look on line it seems the BMW 168 did originally have a drain plug. CC seem to have decided it's not needed......

 

aerobod
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...it seems the BMW 168 did originally have a drain plug.

Certainly for the last few generations of BMW they haven't had drain plugs for the cars that use the 168 diff, currently 120/320/520 etc and smaller engined petrol models.

James

Wrightpayne
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I've done it with engines, drain it, chuck some cheap oil in and get it hot and drain again to act as a flush.

Ian

CtrMint
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The number of owners innocently driving around with their Titan merrily on it way to destruction or causing the whole diff to implode must be immeasurable. With all the background noises attributed to driving a Seven it can be difficult to know when the diff is trying to tell you something. Fortunately mine 'spoke to me' with noises I could not ignore catching it just in time.

Could you expand on what to listen for?  above and beyond the usual symphony of noise.

Caterham 420R S3 Lotus Toxic Green,  Caterham 620R S3 Exocet Red. Blog: https://www.caterham7diaries.com