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348-Assess Clutch Condition

Discussion in 'Technical Q&A' started by Animate, Mar 21, 2005.

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  1. Animate

    Animate Formula Junior

    May 21, 2004
    281
    BC,Canada
    #1 Animate, Mar 21, 2005
    Last edited by a moderator: Sep 7, 2017
    I've got the clutch assembly seperated from the flywheel. It's a single disk type. The disk is about 7mm thick and clearly needs replacing. I'd like to get some feedback on the pressure plate and flywheel condition though.

    On the pressure plate side the clutch disk has worn down to the rivets and has lightly scored the pressure plate. It's very shallow, I would guess .001". The rivets are a much softer and they take the brunt of the wear. Anyway, can the pressure plate be lightly ground, or does it need replacing?

    The flywheel side of the clutch disk has less wear, and the flywheel surface is just discolored. I presume this can be ground lightly to recondition?

    Any recommendations?

    Edit: I just noticed in the third picture that a small amount of flywheel lubricant is being thrown out radially. Is this amount significant. Now I'm rebuilding the flywheel and putting new triple seals in anyway so it's a moot point...just curious about its severity.

    Thanks,
    James
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  2. vincent355

    vincent355 F1 Veteran
    Rossa Subscribed

    Apr 8, 2003
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    Vincent
    #2 vincent355, Mar 21, 2005
    It is possible to resurface the FW. There is a minimum that you can go down to. Unfortunately I can't seem to open my 348 service manual, damn pdf file is protected and I've loaned out the disc with the password.

    Who else has got one?
     
  3. ghardt

    ghardt Formula 3

    Apr 18, 2004
    1,260
    Texas
    Full Name:
    Jerry
    #3 ghardt, Mar 21, 2005
    I'm not a mechanic. However, when I had my full service done about a year ago, my pressure plate looked similar. My disc wasn't nearly as bad. My mechanic, who has plently of ferrari wrench time, said the pressure plate was fine. My clutch works perfectly. I'll look for may pictures and try to post them tomorrow.

    Jerry
    1993 348TB
     
  4. ghardt

    ghardt Formula 3

    Apr 18, 2004
    1,260
    Texas
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    Jerry
    #4 ghardt, Mar 21, 2005
    According to the 348 shop manual, the maximum reduction in flywheel thickness is 1.0 mm.
     
  5. Peter

    Peter F1 Veteran
    Owner

    Dec 21, 2000
    6,441
    B.C., Canada
    #5 Peter, Mar 21, 2005
    Hi James!

    When I did the clutch on my car a few years ago, I replaced the pressure plate and clutch disc, as they came together with the kit and only had the flywheel resurfaced. When a P.P. is not avaliable, it can be resurfaced too.

    When I went to get the flywheel resurfaced, I went to my local Lordco auto store and they directed me to a tranny shop close by that could do it. The next day it was ready. They only needed to shave off a few thou' of material and it cleared up the heat-checked marks and surface cracks. Cost about $40 Cdn.

    I can't speak about the flywheel grease... That's a 348-thing, I'm just a 308 guy! ;)
     
  6. Peter

    Peter F1 Veteran
    Owner

    Dec 21, 2000
    6,441
    B.C., Canada
    #6 Peter, Mar 21, 2005
    Last edited by a moderator: Sep 7, 2017
  7. Animate

    Animate Formula Junior

    May 21, 2004
    281
    BC,Canada
    #7 Animate, Mar 22, 2005
    Thanks for the help guys. I just ordered a new clutch and pressure plate.

    Now to find someone to resurface the flywheel...
     
  8. Tim the Stick

    Tim the Stick Rookie

    Mar 3, 2005
    31
    Taylor, MI
    Full Name:
    Tim Wakeling
    #8 Tim the Stick, Mar 23, 2005
    On another note:

    I usualy make sure to use a "brown" scrubbie pad (on a 90 deg. die grinder) on my freshly cut flywheels and new pressure plates to make "non-directional" scrub marks. Nothing major, just take down the rough machines surface and smooth it out a little, while making small non-directional scrubs in all directions. I've found this does several things.

    1: Clutch break in is less severe on disk wear.
    2: Clutch break in happens FASTER.
    3: Initail engagement is smoother.
    4: slows hear crack formation on the pressureplate side due to the pressure plates "slippery" surfact sompared to the agressive "slash cut" on the freshly machines flywheel.

    Might want to ask your tech to try it. I've done it for years on heavy agressive race clutches, and it lets me break them in faster for more conststant use, faster.

    Stick
     
  9. Animate

    Animate Formula Junior

    May 21, 2004
    281
    BC,Canada
    #9 Animate, Mar 23, 2005
    Tim: I went to an automotive machine facility yesterday to look at the machine they use. It had a rotating table that the flywheel is secured to, and a perpendicular tool spindle that held the grinding stone. I didn't think to ask the name of the machine...is it a 90 degree die grinder?

    Does the brown scrubbie pad get mounted in place of the regular grinding stone? If so, are the non-directional scrub marks the same pattern as the regular grinding tool makes, or do they require a different combination of tool speed/table motion?

    And finally, is the term 'brown' scrubbie pad sufficient to describe this tool, or is there a particular supplier or trade name that would help?

    Thanks for the info...
    James
     
  10. vincent355

    vincent355 F1 Veteran
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    Apr 8, 2003
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    #10 vincent355, Mar 24, 2005
    Got the manual open.

    FW height is 51mm

    Max reduction in fw height is 1mm.


    that leaves a bit of room, a thousandths should be a problem at all.
     

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