Doing my 348 Clutch & Triple Seals | FerrariChat
Buy

Doing my 348 Clutch & Triple Seals

Discussion in '348/355' started by PassionIsFerrari, Jul 7, 2009.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    #1 PassionIsFerrari, Jul 7, 2009
    My 348 lost pressure on the clutch pedal so I figured it was a blown seal on the slave unit (which it turned out to be)

    Pulled the pumpkin off the bell housing and it was very dirty in there. Replaced the seals for the slave unit (which were difficult to find since I have a 2nd generation cast iron unit) but I located the proper seals and installed them into the slave unit.

    I have a Motive Power bleeder so I pumped it up to 10psi (per No Doubt) and checked for leaks under the slave unit....No leaks 2 hours later and pressure is still holding

    Removed the old triple seals and replaced them. Broken one triple seal trying to slide the output shaft back in and now the other 2 are verrry loose. I guess I will order some more and maybe try to clamp down the 2 that are on there with a hose clamp?

    Couple of questions...

    1. Mine clutch is a single disc Valeo. Are the single and double disc 348 clutch discs the same... Can i buy a valeo disc from a double disc 348? Is it interchangable with the AP racing discs? What do you think of adding friction material compared to buying a new disc?...

    2. My 348 spider has 52k miles on it...i do not have hot start or rattling problems...Can i bolt the new disc on and go? If my flywheel needed to be re-surfaced or repacked is there tell tale warning signs that it will give me?
     
  2. FandLcars

    FandLcars F1 Rookie

    Aug 6, 2006
    3,057
    Tempe, Az
    Full Name:
    Rick Schumm
    #2 FandLcars, Jul 7, 2009
    Last edited by a moderator: Sep 7, 2017
    Sorry you're having clutch problems. Below are my 2cents.....

    I've heard single disk clutches and parts are getting harder to find, but I'm sure dual-disk parts won't work on a single-disk clutch. Try to find the part you need from Ricambi or other usual sources. Some have had their disks relined......... try a search and you should find more details.


    A lot (most/all?) of the dual-disk clutches get pretty hot and have burn marks on the pressure plates. I suspect the single-disk clutches are not as bad, but unless your surfaces appear hot, cracked, or have visible wear marks or measurable wear, I believe you should be able to install the new disk and go. However, it isn't that expensive to get them surfaced. Make sure any surfacing includes equal surfacing of the plate mating/bolting surfaces (see pic of my dual disk plate). I think any pro clutch shop will know this.
    Image Unavailable, Please Login
     
  3. 3forty8

    3forty8 F1 Rookie
    Owner

    Apr 25, 2006
    2,713
    San Diego
    Full Name:
    Eric
    #3 3forty8, Jul 7, 2009
    Last edited: Jul 7, 2009
    Single and dual are not interchangeable as they each use a specific flywheel. Getting the discs relined is an option.

    You probably don't need to repack the flywheel. Your flywheel really needs to be looked at by a specialist to determine if it needs to be re-ground. I had my dual disc clutch relined and the plates & flywheel re-ground for about $500 at a clutch shop, and your single should be even less expensive.
     
  4. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #4 No Doubt, Jul 7, 2009
    Relining your clutch disc is fine. I see no difference between that and a new clutch.

    As for your flywheel, if it hasn't turned blue and has no cracks, you don't need a new one. If you don't hear loud clatter when engaging it and if you are getting decent life out of your clutch lining, then you don't have to have it machined down. In fact, machining the flywheel actually changes internal tolerances. You are limited to how many times it can be done.

    There is an intermediate step, however. You can simply hand sand the surface of your flywheel with 400 grit paper to remove casual rust and get it prepped for your new clutch lining. Won't take twenty minutes of your time.




    Oh, a dual clutch plate won't properly replace a full single clutch plate. Reline or buy new, but keep the single clutch plate either way.
     
  5. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    #5 PassionIsFerrari, Jul 8, 2009
    Still waiting to borrow a digital cam to upload pics of the flywheel and pressure plate surfaces. There is no burn marks (that i can tell) and definitely no gashes or scrapes on the surfaces of either.

    Measured the thickness of the clutch disc today at different point of the disc...is it normal for it to be off a couple of hundredths of a millimeter in different locations?
    It measured 8.65mm in most areas give or take a couple hundredths of a millimeter....

    Any one have the specs and tolerances of the single disc valeo clutch discs?

    Also, when i bolt down the clutch pack, what is the torque settings for the bolts?

    Thanks guys...
     
  6. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    #6 PassionIsFerrari, Jul 9, 2009
    anyone?
     
  7. 3forty8

    3forty8 F1 Rookie
    Owner

    Apr 25, 2006
    2,713
    San Diego
    Full Name:
    Eric
    #7 3forty8, Jul 9, 2009
    Last edited by a moderator: Sep 7, 2017
  8. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    #8 PassionIsFerrari, Jul 9, 2009
    wonder if I did something wrong...how could it be thicker then what the WSM says....
     
  9. PassionIsFerrari

    PassionIsFerrari Formula 3

    Aug 15, 2004
    2,454
    #9 PassionIsFerrari, Jul 9, 2009
    Im such a dummy. I didnt set the dial to zero...It measured 6.7mm so i guess i am going to take the disc into a shop in town and have them reline the disc...

    Does anyone know the torque settings when i put the clutch pack back in?
     
  10. FandLcars

    FandLcars F1 Rookie

    Aug 6, 2006
    3,057
    Tempe, Az
    Full Name:
    Rick Schumm
    #10 FandLcars, Jul 10, 2009
    Last edited: Jul 10, 2009
    Looks like you've been around Fchat for quite some time. Have you ever downloaded a copy of the 348 workshop manual? I downloaded a copy from somewhere.... do a search here to see if you can find where to get a copy... I believe I've even seen Daniel at Ricambi send CD copies to folks who ask for a copy (don't mean to obligate him though).

    Torques are mentioned in the manual clutch section: 13 Newton-Meters for pressure plate and ring gear nuts for the single disk clutch. This is 9.6ft-lbs or about 115 inch-lbs. The manual will have all specs and setup info, so you should get a copy if you don't have one.
     
  11. 3forty8

    3forty8 F1 Rookie
    Owner

    Apr 25, 2006
    2,713
    San Diego
    Full Name:
    Eric
    #11 3forty8, Jul 10, 2009
    Lots of copies of the 348 WSM floating around on the net; here is one of the best quality scanned PDF copies I've come across:
    http://www.ferraridatabase.com/The_Downloads/Downloads.htm

    Scroll down to the "Workshop Manuals" section and select "Workshop manual 348" (270MB PDF file). For some reason it won't let me link directly to the PDF.
     
  12. FandLcars

    FandLcars F1 Rookie

    Aug 6, 2006
    3,057
    Tempe, Az
    Full Name:
    Rick Schumm
    #12 FandLcars, Jul 10, 2009
    Sometimes torques listed in Ferrari manuals don't seem to be accurate. 13N-M listed in the manual seems low to me, although I'm not sure of the size of these fasteners. If you can post the size and thread pitch of these fasteners, we can doublecheck what a reasonable torque would be for these.
     

Share This Page