308 main seal replacement | FerrariChat

308 main seal replacement

Discussion in 'Technical Q&A' started by marankie, Aug 15, 2007.

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  1. marankie

    marankie Formula Junior

    Joined:
    Aug 30, 2004
    Messages:
    252
    Location:
    Agoura Hills, Calif
    Full Name:
    Martin
    My main crankshaft oil seal (behind the flywheel) is leaking. Anyone have experiences that they can share on relacement procedures?
     
    marankie, Aug 15, 2007
    #1
  2. 350HPMondial

    350HPMondial F1 Veteran Silver Subscribed

    Joined:
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    Location:
    18 mi from the surf,, close to Pismo, CA
    Full Name:
    Edwardo
    Do a clutch job,,, then mark and remove the flywheel locking tab washer, then mark and remove the flywheel, then mark the crank shaft.

    Pull the seal, it is a 100 X 80 X 10... SKF makes one at NAPA for $ 28.00 usa
    ( I have the part number at home.)
    Use a seal puller, or a trick I know.
    (Drill a 1/16" hole in the seal, thread in a drywall screw and use a claw hammer to yank that seal out. (Don't damage the crank shaft...! PM me.)
    Grease up new seal with black moly grease.
    (This will prevent it from leaking.)
    Press in the new seal.

    Finish clutch job.

    (anybody know of steps I left out..?)

    Good luck,
    Edwardo
     
    350HPMondial, Aug 15, 2007
    #2
  3. Owens84QV

    Owens84QV F1 Rookie

    Joined:
    Oct 2, 2001
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    Greg
    It's not that bad of a job. If you stay on it, it can be a weekend job. Tear-down (removal of drop-down case, drop-down gears, bell housing, clutch, etc.) Remember to properly mark the flywheel because the flywheel bolts are not uniform. If you don't mark them, you'll spend some time getting them lined up properly again.
     
    Owens84QV, Aug 15, 2007
    #3
  4. Mike Duncan

    Mike Duncan Rookie

    Joined:
    Aug 11, 2007
    Messages:
    13
    Check your crankcase vent system first, excess pressure can push oil out there.
     
    Mike Duncan, Aug 19, 2007
    #4
  5. Mark 328

    Mark 328 Formula Junior

    Joined:
    Nov 6, 2003
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    510
    Location:
    Orange, Ca
    Full Name:
    Mark Foley
    Did the leak recently occur? If so it could be your oil. My 328s (Fcar & BMW) are pretty tolerant, but I have had trouble with certain oils leaking past the main seal in our Chrysler cars. Our Durango leaks Mobile 1 out of the seal, but the same viscosity Quaker State Syn stays-in? I retried Syn oil because to improve the duration of oil changes.
    You may want to post what oil you are using and see what others use for your model/year.
    Could it also be a temperature caused problem--from extra summer heat? or an oil pressure problem.

    Sometimes an oil change can cure a seal leak.

    Mark
     
    Mark 328, Aug 20, 2007
    #5
  6. moretti

    moretti Five Time F1 World Champ Lifetime Rossa Owner

    Joined:
    Nov 1, 2003
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    Location:
    Australia
    Full Name:
    John
    had mine replaced in 3 hours by my mechanic and the seal cost $30, the disclaimer is that I had the car up on my hoist, wheel and inner guard taken out waiting for him to pull the bell housing off, clutch assy and flywheel

    We found that the flywheel had some minor hairline fractures so replaced the flywheel ($1200), clutch and pressureplate were good, car had done 44,000 miles
     
    moretti, Aug 20, 2007
    #6

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