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Thread: m50 rear main seal

  1. #1
    Join Date
    Oct 2004
    Location
    Bay Area, CA
    Posts
    261

    Default m50 rear main seal

    Hey guys,

    I'm replacing the rear main seal on the good ol' m50.
    Is it really necessary to use new flywheel and driveplate bolts??

    Thanks for any opinions / suggestions / experiences in advance

  2. #2
    Join Date
    Jan 2006
    Location
    New Milford, Ct
    Posts
    271

    Default

    It can't hurt
    Are you just doing the seal, or doing clutch, etc.?
    Support your American Flag Merchant Marine
    No BMW at this time, eyeing a 91 318iS. 00 Saab 9-5, 89 Bronco XLT, 05 Kawi Z1k, 00 Ducati 748S Bip

  3. #3
    Join Date
    Oct 2004
    Location
    Bay Area, CA
    Posts
    261

    Default

    Trans was getting replaced, so while its out I figured the seal is a good idea.

    But yeah - I was thinking new bolts seems a little over-the-top. I don't see why they'd have to be replaced, it's not like they are lock nuts or anything.

  4. #4
    Join Date
    Jan 2004
    Location
    Thunder Bay, Ontario
    Posts
    2,538

    Default

    If this is an auto I'm out of my league (do they have a pilot bearing? I don't think so). If its a stick, change the pilot bearing. Otherwise, the only other thing you haven't mentioned is the gasket for the rear seal housing.

    For my manual, I did use new flywheel bolts (they have a locking compound on em) and pressure plate to flywheel bolts. Cheap insurance.

    If its an auto, keep asking as someone will give you the news,

    Dave M

    10/90 Build 525im, 630,000+km, Eibach/Sachs, Engine Rebuild
    *RIP Oskar the DOG *

  5. #5
    Join Date
    Oct 2004
    Location
    Bay Area, CA
    Posts
    261

    Default

    Thanks for the advice, yep ... it's an auto.

  6. #6
    Join Date
    Sep 2005
    Location
    Goulburn Australia
    Posts
    689

    Default

    New bolts are cheap enough. The old ones may be fine but for peace of mind you might as well.
    Cheers

    Wingman
    '89 525i/A Exec 193000kms
    '94 Subaru Liberty AWD Wagon
    Looking for Merc 300TE
    NSW, Australia

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