348 - Broken Diaphragm Spring on my Twin Plate Clutch - Options? | Page 2 | FerrariChat
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348 Broken Diaphragm Spring on my Twin Plate Clutch - Options?

Discussion in '348/355' started by 348Jeff, Aug 21, 2022.

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  1. 348Jeff

    348Jeff Formula 3

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    #26 348Jeff, Sep 2, 2022
    I swapped out my broken diaphragm spring for the good one today. Pretty easy job but time consuming s quite a few bolts.

    With an allen key in one side and a socket on the other I loosened all the bolts holding the "diaphragm sandwich" together

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    As you loosen the bolts some of the spacers start to drop out.

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    Once apart I lay the good one on top of the old one and you can see that other leaves of the spring were about to break.

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    All the parts (minus spacers and bolts) laid out ready for assembly.

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  2. 348Jeff

    348Jeff Formula 3

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    #27 348Jeff, Sep 2, 2022
    Last edited: Sep 2, 2022

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  3. 348Jeff

    348Jeff Formula 3

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    #28 348Jeff, Sep 2, 2022
    I'd like to regrease the flywheel next, however since MadDog clutches shut down I've no idea what size O rings to buy - especially the large one that is used to seal the case. I'm also unsure of the size of the bolts with ultrafine thread to screw into the inspection bolt holes to split the case apart. Anyone know?


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  4. John Glen

    John Glen Formula Junior

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    #29 John Glen, Sep 2, 2022
    Looks good Jeff. I got all my o rings and the famous "Kluber" grease from Superformance UK. Regarding the process of splitting the cover of the flywheel using a couple of "jack screws" it was very simple and I just used a few metric bolts and gently evenly applied them. You're just lifting the lid enough to release the large o ring and the cover will pop off. Sorry, I don't remember the thread size but it should be obvious. Just make sure your jack bolts have plenty of thread so as not to bind up. JGW
     
  5. John Glen

    John Glen Formula Junior

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    #30 John Glen, Sep 2, 2022
    PS, Make sure you use the correct size Torx ? bit. These special bolts are not procurable
     
  6. 348Jeff

    348Jeff Formula 3

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    #31 348Jeff, Sep 3, 2022
    Thanks John. I've bought the correct grease from superperformance but they said they dont stock the o rings??? cant find them on their website and I even rang them so at a bit of a loss now - its holding up the job :-(

    I have the correct Torx bit - I actually bought it off MadDog :)

    This morning I am droppng off my clutch housing to get vapour blasted and clear ceramic coated.
     
  7. Finpat

    Finpat Formula Junior

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    #32 Finpat, Sep 3, 2022
    Sorry for a slight OT but as a new 348 owner with a dirty pumpkin I am interested to hear any experiences about cast aluminium clear coats. I assume it is a product like "Cerakote" or are there some special products for this use?

    Related to the topic in this thread, what is the cost difference between diaphragm spring and full assembly? I have broken my share of pressure plates with P-cars but in that domain typically rebuilding wasn't techno-economically optimal solution.
     
  8. m.stojanovic

    m.stojanovic F1 Rookie
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    #33 m.stojanovic, Sep 3, 2022
    The thread of the "inspection bolts" is M10 x 1.0.

    The bit for the other bolts is actually "Ribe", size M8 (sometimes marked RM8):
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  9. 348Jeff

    348Jeff Formula 3

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    #34 348Jeff, Sep 3, 2022
    Its Cerakote they are going to use, however, I reckon I could of just clear coated it with caliper paint or similar.

    You cant just buy a diaphragm spring - the cheapest alternative if I couldnt of got a a replacement spring is the clutch cover below for £868.64 UK. TBH though - if your replacing that it would be foolish not to do the friction disks too.

    https://www.demon-tweeks.com/uk/helix-uprated-clutch-cover-hlx60-5010/
     
  10. 348Jeff

    348Jeff Formula 3

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    #35 348Jeff, Sep 3, 2022
    Thanks Milo - Ill order some. I wasnt sure as I was told the thread is ultra/super fine.

    I actually bought my torx bit from Andrew at MadDog so its definitely the tight size.
     
  11. 348Jeff

    348Jeff Formula 3

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    #36 348Jeff, Sep 5, 2022
  12. POLO35

    POLO35 Formula Junior

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    #37 POLO35, Sep 5, 2022
    A little late but I just thought I would chime in it is not only possible, but very easy to remove the clutch pumpkin WITHOUT removing the bumper and the upper exhaust can.. I've had mine out 4 times. You just need little fingers and a little patience. Nice work though nice repair.
     
  13. 348Jeff

    348Jeff Formula 3

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    #38 348Jeff, Sep 6, 2022
    Hi Matt - you must have tiny hands LOL

    I just thought the photos would be more interesting with the bumper off plus its so easy to remove its a case of "why not?"

    Anyway, Bell Housing is back from the vapour blasters - had them do it inside and out followed by a coat of clear Cerakote so it should stay that way. very pleased with it. Just got to repaint the script and cavalino back on :)

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  14. 348Jeff

    348Jeff Formula 3

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    #39 348Jeff, Sep 6, 2022
    Andrew informs me that F A G bearing 3208-BD-2HRS-TVH-C3 is compatible too (and about 1/2 price of the NSK)
     
  15. m.stojanovic

    m.stojanovic F1 Rookie
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    #40 m.stojanovic, Sep 7, 2022
    I see that NSK 3208 B2RSRTNGC3 is about $50 if you buy it from bearing suppliers and so is the F-A-G. So, we have three choices at ~$50:

    1. SKF 3208A-2RS1 TN9/C3 MT33
    2. NSK 3208 B-2RSR-TNG-C3
    3. F-A-G 3208-BD-2HRS-TVH-C3

    However, all of them are good for up to 120C and not 140C like the original SKF (HT22). As to the max rpm, I couldn't find the info for the first two; the F-A-G spec says 8900 rpm which is very good (the bearing probably has non-contact seals).

    PS: Funny how the acronym F-A-G is censored if written without the dashes (because it sounds like the F***K)
     
  16. 348Jeff

    348Jeff Formula 3

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    #41 348Jeff, Sep 7, 2022
    I would imagine that since Ferrari themselves (and eurospares) sell NSK 3208 B-2RSR-TNG-C3 (no 2 in your list) as an "official" Ferrari part you'll be fine as long as the bearing matches the spec/temp/rpm etc
     
  17. steved033

    steved033 F1 World Champ
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    #42 steved033, Sep 7, 2022
    In the US, as a word, it's derogatory for homosexual. The fchat filter doesn't make exceptions, just finds the word string.

    sjd
     
  18. 348Jeff

    348Jeff Formula 3

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    #43 348Jeff, Sep 11, 2022
    Last edited: Sep 11, 2022
    Just been replacing the bearing in the flywheel today and have a question...

    Used an inner bearing removal tool (like a slide hammer)

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    Area where the bearing came out - no sign of an o-ring

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    Bearing being pressed back in (using the old bearing as a cushion)

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    Quick video of the bearing being pressed back in...

    https://youtube.com/shorts/ImFvXywoM-4?feature=share

    But in the parts diagram it shows an o-ring (that I have bought) but it doesn't seem to have anywhere to go? Or should it be on the shaft that goes through the bearing and the diagram is just misleading????

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    This is a pic of the o-ring laid in the place the diagram indicates???
     

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