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Advise on tool needed to remove then retorq this nut up.

Discussion in 'Technical Q&A' started by Peppi, May 8, 2004.

  1. Peppi

    Peppi Karting

    Mar 15, 2004
    75
    UK Wales Cardiff
    #1 Peppi, May 8, 2004
    Last edited by a moderator: Sep 7, 2017
    I need to remove this nut off the cambelt drive sprocket on my mondial t 1993 inorder to be able to remove the sprocket , to replace the oil seal behind it ,then need to torque the nut back up or is it best to replace the special nut with a normal hex nut , could someone please tell me , is there a special tool that one needs to buy ,or has someone used other ? , to remove this special nut ?
    Thankyou to all repies , kind regards Peppi.
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  3. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    7,012
    You could weld 4 tabs on a socket
    or
    you can grind out a section of a socket leaving 4 tabs
     
  4. RAYMAN

    RAYMAN Formula Junior
    BANNED

    Mar 10, 2004
    315
    Oklahoma
    Full Name:
    Raymond Santilli
    You need a spanner wrench for that. Not common, but I've never shoped for one.
     
  5. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    19,282
    Texas
    Full Name:
    Steve Magnusson
    Peppi -- Do a search here and at the old site on "ring nut".
     
  6. ferrarifixer

    ferrarifixer F1 Veteran
    BANNED

    Jul 22, 2003
    8,520
    Melbourne
    Full Name:
    Phil Hughes
    It's the same tool as all the 308 and BB series cam drives. Also TRossa steering wheel. Any Ferrari specialist/dealer will have it.

    I don't have the torque, but it is tight. To make your own tool will mean doing a very good job. Many of us have spent a day making a tool, only for it to break very quickly.

    The best way to make the tool is to have a sleeve around the 4 tabs that is welded to them, so they don't bend over and shear off.

    Be aware there is a bearing upgrade for certain engine numbers on this drive gear...check with Ferrari whether yours has been done.
     
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  8. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,186
    San Carlos, CA
    Full Name:
    Mitchell Le
    That is a pretty critical place, I would just spring for a special socket. $75, I think, from baum tools.
     
  9. ham308

    ham308 Formula Junior

    Nov 3, 2003
    358
    NE Switzerland
    Full Name:
    Richard Ham
    I was one of those people who spent some time grinding up a tool only to have it fail. Those nuts are done up tight.

    I see you're in Cardiff. I couldn't find the correct tool for a reasonable price in Europe. Ferrari were ~£130 and elsewhere not much cheaper. In the end I removed the nuts by drilling and a friend made some up on a lathe starting from a normal good quality nut. It's not difficult but it's a non standard M17x1 thread.

    The hexagon makes it very easy to tighten them back up properly.

    By the way, don't know about the modial T, but on a 308 if the oil seal is gone here, it usually means the ball bearings supporting the shaft are also toast.

    -------------
    Richard
     
  10. Peppi

    Peppi Karting

    Mar 15, 2004
    75
    UK Wales Cardiff
    The question that I asked has been kindly answered by all , just wanted to say thankyou for taking the time for all your advise on this , to my question.

    The seal is not actually leaking, just wanted to change it whilst I have the chance to do so ,as a preventitive measure more than anything else.

    To all , Thanks regards Peppi.
     

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