Results 1 to 6 of 6

Thread: E34 M5 Transmission Rebuild Questions

  1. #1
    Join Date
    Sep 2004
    Location
    Canada; Colder than Sweden!
    Posts
    1,132
    My Cars
    1993 325i Turbo, 1990 M3

    E34 M5 Transmission Rebuild Questions

    We have the tranny out of the car and are trying to get it apart because there is a gear with a broken tooth inside. We are having trouble getting the tranny apart. See below.



    We can't get section 2 off, and we want to get into where the gears are. Any suggestions? I can't find any info anywhere on how to get this thing apart.

    Nik
    1993 325i, M3 ZF tranny, laguna grun, Holset HX35 bottom mount .

  2. #2
    Join Date
    Sep 2004
    Location
    Alpharetta, Columbus GA
    Posts
    6,079
    My Cars
    94 540,72 3.0CS,'13 WRX
    The trans is supposedly assembled with the aid of a 5 ton press. Alternatively, you have to heat it up to ~200 degrees to expand it enough to remove the cover.

    Hope you know what you are doing man, rebuilding is a path taken by very few people...

  3. #3
    Join Date
    May 2005
    Location
    OH
    Posts
    3,639
    My Cars
    .
    Requires a few special tools (or the ability to improvise). The factory service manual lists the general procedure for rebuilding one of these, with the tools.... You will NEED some of the information in that manual to properly put this thing back together, let alone take it apart.

    Frankly, you might want to have it rebuilt by someone who knows what they're doing. If you're trying to separate the front half of the case from the rear, there are clips on the main and lay shaft front bearings that need to be removed and a bunch of other little things. Then the rear half of the transmission has to be pressed out of the front.
    Breaking now...

    E65/E66: '04 760Li, '08 750Li
    E60: '08 535xi, '08 528xi, '07 530xi
    E53: '02 4.4i, '05 4.4i, '03 3.0i
    E46: '01 330ci
    E39: '97 528i, '01 530i x3
    E38: '01 740iL
    E36: '98 328i
    E34: '92 525i
    ...and various others > more pics & info


    >> Like my facebook page - facebook.com/bimmerpc

  4. #4
    Join Date
    Sep 2005
    Location
    North Carolina
    Posts
    10,579
    My Cars
    '86 M635/'10 Clubman
    Quote Originally Posted by niks325i View Post
    We have the tranny out of the car and are trying to get it apart because there is a gear with a broken tooth inside. We are having trouble getting the tranny apart. See below.



    We can't get section 2 off, and we want to get into where the gears are. Any suggestions? I can't find any info anywhere on how to get this thing apart.

    Nik
    Nik - you aren't going to rebuild a 280 in the dark. They are a pain to work on, and require some special tools (I suppose you could improv) in a couple places.

    A rebuild starts at $1800 or so and depending on what needs replacing can run up to $2400 or so (though there are master rebuilders like Blanton who cost almost twice that).

  5. #5
    Join Date
    Sep 2002
    Location
    Lincoln, NE
    Posts
    3,561
    My Cars
    E23 735i
    There's actually a guy here in my local chapter that has done a rebuild on an E34 M5 box. (the early 5-speed) He actually managed to get his hands on the factory diagrams. He's on the M5 yahoo group, so I'd check that out and do some searching or asking around there.
    1986 BMW 735i Turbo, 5-speed
    2010 Mazda5
    1966 Corvair Sedan

  6. #6
    Join Date
    Sep 2004
    Location
    Canada; Colder than Sweden!
    Posts
    1,132
    My Cars
    1993 325i Turbo, 1990 M3
    Quote Originally Posted by Mr Project View Post
    There's actually a guy here in my local chapter that has done a rebuild on an E34 M5 box. (the early 5-speed) He actually managed to get his hands on the factory diagrams. He's on the M5 yahoo group, so I'd check that out and do some searching or asking around there.

    Alright, I'll check into that.

    Nik
    1993 325i, M3 ZF tranny, laguna grun, Holset HX35 bottom mount .

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •