Z4MC differential rebuild

N

Nooms1

Member
Hi All

Unfortunately, I've a noise from the rear of my Z4MC which has gradually got loader. I've had it diagnosed as the differential. The car has only covered 23.5k miles which is a bummer! My guess is the garage that did the last inspection 2 service at 16K miles and diff oil seal replacement (for the previous owner) over tighted the nut.

Any thoughts/experiences would be appreciated on rebuild (a tad specialist to say the least) and third party rebuild (not so keen on exchange as I would like to keep mine)?

I'm looking to remove the diff myself at the moment. Any good guides/videos available. I don't believe it's an over complicated processjust a bit fiddly and heavy snd ill be doing it in a single garage ehich is far from ideal.

Thanks in advance

Steve (Nooms1)
 
JC Racing for the diff work once out of the car

The previous work COULD have been the cause of the noise due to not putting either BMW diff oil in or a friction modifier (Red Line stuff that is out of stock and has been for months the UK)

Other than getting the diff it apart it is not too hard but having seen the tools JC Racing have made to do the job just give it to them or one of the others that can do it right
 
Thanks PDJ for your input and recommendation. I'm also thinking of getting a second opinion on the cause of the noise before I remove the diff. Particularly as there appears to be quite a few instances where people have had diffs rebuilt and they still have the noise.
 
I just did mine. Still need to put the rebuilt unit back on but setting the diff to spec is very time consuming and requires access to hydro press and bearing pullers and drives. Still cheaper if you are confident to do a DIY, but if not, just pay a specialist.
 
maupineda said:
I just did mine. Still need to put the rebuilt unit back on but setting the diff to spec is very time consuming and requires access to hydro press and bearing pullers and drives. Still cheaper if you are confident to do a DIY, but if not, just pay a specialist.
Click to expand...

Thanks Maupineda. The worse case scenario is that I remove and refit the diff myself but get a specialist to rebuild/refurb it.
 
Nooms1 said:
I remove and refit the diff myself but get a specialist to rebuild/refurb it.
Click to expand...

This is what I did but a full refurb of all the bit around the subframe at the same time
 
Nooms1 said:
Particularly as there appears to be quite a few instances where people have had diffs rebuilt and they still have the noise.
Click to expand...

The input flange of the diff and the prop shaft needs to have a handful of grease in the inclosed bit between the two

Can not remember what I was told would happen if I did not BUT it COULD be it makes a noise
 
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