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Thread: Rear diff rebuild - where?

  1. #1
    Regular Kev_G's Avatar
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    Rear diff rebuild - where?

    Right I'm stuck here rather badly.

    My E91 325d diff is making a fair old whining noise has for a while and if I'm honest has since I've had the thing only its got a lot louder since then. The car went in to have the duel mass flywheel with clutch replaced but also to have the diff refurbished as the specialist used a place that was reasonable in price and was rather quick at turning them around.

    This place is no longer a option as they went bust but looking at other areas quotes are coming back at basically 1000

    Has anyone any advise or company's I could try as I really want to get it done as IMO I could spend 4-500 on another second hand diff and get in the same situation again or worse.

    Quaife was 1200 btw but no I don't need or want that.

    Help
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  2. #2
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    When was the last time it had new oil?
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  3. #3
    Have you tried contacting JC racing in Yorkshire, I know they do diffs for most BMW stuff http://www.jcracing.info/?page=sales&category=3

    Address:
    JCRacing
    Unit 5,
    Europark,
    Thirsk,
    Yorks,
    YO7 1GQ
    Phone:
    01845 527777
    07812 202553
    E-Mail:
    johncockburn@jcracing.info
    Online:
    http://www.jcracing.info

    Says on the site they see 20 diffs a week!
    Last edited by GVK; 16-05-2017 at 10:54 PM.
    Quote Originally Posted by bimmer View Post
    It looks like shit.

  4. #4
    Regular Kev_G's Avatar
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    Quote Originally Posted by Tim View Post
    When was the last time it had new oil?
    sadly sealed unit so unable to do a fluid change

    Quote Originally Posted by GVK View Post
    Have you tried contacting JC racing in Yorkshire, I know they do diffs for most BMW stuff http://www.jcracing.info/?page=sales&category=3

    Address:
    JCRacing
    Unit 5,
    Europark,
    Thirsk,
    Yorks,
    YO7 1GQ
    Phone:
    01845 527777
    07812 202553
    E-Mail:
    johncockburn@jcracing.info
    Online:
    http://www.jcracing.info

    Says on the site they see 20 diffs a week!
    Cheers I'll try them
    Daily - E91 325d M-Sport Touring
    Project - A Need for Swede (sold for parts)

  5. #5
    Regular crossie's Avatar
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    JC Racing charge good money but do a great job!


    Gareth Purves off the E30 zone is known to be the best to rebuild E30 diffs - maybe worth a message
    https://www.facebook.com/gareth.purves?ref=br_rs

  6. #6
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    Quote Originally Posted by Kev_G View Post
    sadly sealed unit so unable to do a fluid change
    Really? That's a bit rubbish.
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  7. #7
    Regular Kev_G's Avatar
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    Quote Originally Posted by Tim View Post
    Really? That's a bit rubbish.
    Very. As when I got the car I did a gear box fluid change and asked to do the diff and thats how I found out
    Daily - E91 325d M-Sport Touring
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  8. #8
    Regular suj's Avatar
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    Kev, are you sure about that?
    As i'm pretty sure you can change the oil on them.

    It is like when I had my 740iL I was told "gearbox oil is a lifetime item", yet they sell the gearbox filter and oil, I also found the manual from ZF of the procedure to do so....

  9. #9
    Yeh it should have a fill/drain hole regardless

    Also I wouldn't bother rebuilding it.... just try an oil change first

    If that fails get a second hand diff.

    Rebuilding these with new bearings is quite a specialist thing and the bearings are not cheap either!
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  10. #10
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    As above, 'sealed for life' doesn't necessarily mean you won't find a drain or fill plug on the diff somewhere. Have a nosey around, check you can undo the fill one before you undo the drain one if it has both.
    Definitely the first port of call
    Too many cars...

  11. #11
    Regular suj's Avatar
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    Quote Originally Posted by Stu View Post
    As above, 'sealed for life' doesn't necessarily mean you won't find a drain or fill plug on the diff somewhere. Have a nosey around, check you can undo the fill one before you undo the drain one if it has both.
    Definitely the first port of call
    http://workshop-manuals.com/bmw/3_se...erential_incl/



    http://www.e90post.com/forums/showthread.php?t=385975


    [

  12. #12
    Regular Kev_G's Avatar
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    Ahhh thank you this is sheding some light then. The rebuild cost at JC above was with BMW parts and about 450 inc vat which is about the same as a second hand diff.

    It is very strange but got the car back today and the mrs and I agree the diff noise isnt as loud as before. Only thing we can think is that the other issue was increasing noises and masking them. I will get under it tomorrow and look for the drain hole as prehaps if I can suck as much fluid as I can out to refill it would help.

    thanks Ill report back tomorrow
    Daily - E91 325d M-Sport Touring
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  13. #13
    Regular Uncle Benz's Avatar
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    Are you sure it's not the propshaft centre bearing? The prop will have been out for a clutch, and re-aligning the centre bearing when refitting can often alter the sound of a slightly noisy one.
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  14. #14
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    Quote Originally Posted by Uncle Benz View Post
    Are you sure it's not the propshaft centre bearing? The prop will have been out for a clutch, and re-aligning the centre bearing when refitting can often alter the sound of a slightly noisy one.
    I will have to check on that but good shout
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  15. #15
    Regular suj's Avatar
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    Quote Originally Posted by Uncle Benz View Post
    Are you sure it's not the propshaft centre bearing? The prop will have been out for a clutch, and re-aligning the centre bearing when refitting can often alter the sound of a slightly noisy one.
    Yep I suggest this and the "guibo", make sure it is aligned back the way it was taken off, too many times have I seen people remove it and put in a different orientation and then it needed to be re-balanced!

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    You need to put sawdust in the radio. This cures all known noises.
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