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

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

 

You need a spanner wrench for that. Not common, but I've never shoped for one.

 

Peppi -- Do a search here and at the old site on "ring nut".

 

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.

 

That is a pretty critical place, I would just spring for a special socket. $75, I think, from baum tools.

 

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.

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Richard

 

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.