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
    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
    You could weld 4 tabs on a socket
    you can grind out a section of a socket leaving 4 tabs

    RAYMAN Formula Junior

    Mar 10, 2004
    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 Two Time F1 World Champ
    Lifetime Rossa

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

    ferrarifixer F1 Veteran

    Jul 22, 2003
    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

    Nov 29, 2001
    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
    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.

  10. Peppi

    Peppi Karting

    Mar 15, 2004
    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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