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Thread: Sportomatic clutch reline

  1. 06-08-2015, 06:38 AM #1
    pht9
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    Sportomatic clutch reline

    Can anyone confirm (by measuring a NOS) the thickness of a Sportomatic clutch plate for a 925 gearbox please ?

    These are now NLA and we are having one refaced

    There does not appear to be any factory information, regarding this
    Phil Hindley
    Tech 9 Motorsport
    United Kingdom

    www.tech-9.co.uk

    Early S registry membership #2207

    65 911 Racecar
    82 911 SC Coupe
    91 944 Turbo
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  2. 06-08-2015, 06:46 AM #2
    911quest
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    We have had them re lined but we take them all the parts and have the pressure plate and flywheel resurfaced then they can re line the disc to take up for what has been machined.
    Tony Proasi

    52 split window coupe
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  3. 06-10-2015, 12:51 AM #3
    pht9
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    still looking, if anyone can assist ?
    Phil Hindley
    Tech 9 Motorsport
    United Kingdom

    www.tech-9.co.uk

    Early S registry membership #2207

    65 911 Racecar
    82 911 SC Coupe
    91 944 Turbo
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  4. 06-10-2015, 01:30 AM #4
    Jon B
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    Quote Originally Posted by pht9 View Post
    Can anyone confirm (by measuring a NOS) the thickness of a Sportomatic clutch plate for a 925 gearbox please ?
    These are now NLA and we are having one refaced
    There does not appear to be any factory information, regarding this
    This is from the factory Technical Specifications booklets.
    1972-73 Models booklet, page 44; 1974 Models booklet, page 38; 1975 Models booklet, page 36; 1976-77 Models booklet, page 34; 1978-81 Models booklet, page 50; etc...

    Transmission Clutch - Sportomatic

    Clutch plate with riveted lining

    Free thickness (new): 7.3mm +/-0.4
    Wear limit: 5.5mm (when worn evenly)
    Permissible lateral runout: max 0.5mm

    Free thickness means not compressed.
    The only difference through the years was the tolerance when new, from +/-0.4mm to +/-0.25mm in later booklets.

    Jon B.
    Vista, CA
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  5. 06-10-2015, 05:50 AM #5
    JT912
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    Will this work?
    http://www.lufteknic.com/Merchant2/m...de=clutch_disc

    Or this?
    http://www.einmaligparts.com/Cluth-Disc20_p_57350.html
    John Thompson

    1966 912. My first car. Bought it Nov. 25, 1988. Still have it.
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  6. 06-10-2015, 06:02 AM #6
    pht9
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    Quote Originally Posted by Jon B View Post
    This is from the factory Technical Specifications booklets.
    1972-73 Models booklet, page 44; 1974 Models booklet, page 38; 1975 Models booklet, page 36; 1976-77 Models booklet, page 34; 1978-81 Models booklet, page 50; etc...

    Transmission Clutch - Sportomatic

    Clutch plate with riveted lining

    Free thickness (new): 7.3mm +/-0.4
    Wear limit: 5.5mm (when worn evenly)
    Permissible lateral runout: max 0.5mm

    Free thickness means not compressed.
    The only difference through the years was the tolerance when new, from +/-0.4mm to +/-0.25mm in later booklets.

    Jon B.
    Vista, CA
    Jon, perfect ! - thank you, don't know how I missed this in the spec book
    Phil Hindley
    Tech 9 Motorsport
    United Kingdom

    www.tech-9.co.uk

    Early S registry membership #2207

    65 911 Racecar
    82 911 SC Coupe
    91 944 Turbo
    Reply With Quote Reply With Quote
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