86 Testarossa Coupling on end of Cam

I think the answer is "yes" as any leaking at that joint between the cam and the new style coupling is still on the "wet" side of the lip seal contact surface. The engineers got a little too tricky for their own good by incorporating that "rubber torsional damper" in the early style coupling. Service Bulletin 10-15 describes the change and the procedure for installing the newer "solid" coupling piece. Give a shout if you don't have a copy of SB 10-15 (and where they misuse the word "caulk" for retaining the cross-pin, some better technical English words would be "stake" or maybe "swage" or maybe "dimple" -- i.e., a metal deforming process).

 

Steve, can you please post the TSB or perhaps cite a web page for download?

Not sure of which parts you both speak of. Could you please rephrase with some item numbers?


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#25

new: 133063 (solid)
old: 129121 or 126166 (just a guess, but, by the pictures at Maranello Concessionaires, it looks like they first tried to fix it with a different rubber material and then just went to the solid piece to fix it better )

Service Bulletin 10-15 here:

https://www.dropbox.com/s/7zgmil09qpbfgdo/SB 1986 10-15 328 mondial tr.pdf?dl=0

 

Are you sure? Maybe your supplier already superceded to providing the 133063 part even if you ordered 126166?

Here are the pics from Maranello Concessionaires:

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Does the new coupling piece that you have match match either of those? The 1990 TR SPC only shows the 133063 part so that's the latest and greatest.

 

Also see service bulletin #464, dated 12/9/1986. Rifledriver helped me with this very issue last year and hopefully he will chime in.

As I recall, there are two updated coupling versions that you can buy. Basically, one already has the hole drilled for the roll pin and the other does not.

 

Can you post a copy/link to #464?

 

No reason you can't use the 126166 part (although that still has the potential to leak if the rubber fails). If your 126166 looks like the picture, why did you call it "solid"?

 

Perhaps #464 explains it better as I think #464 might be the change going from 126166 to 133063 (and I note that even the 1987 TR SPC also only lists the 133063 part so seems they didn't use 126166 for long). If someone has #464, please post.

 

There are 2 styles of updated, solid cam extension. I suspect they ran out and issued a new contract with a different supplier and a different design and new part number resulted. They also got very expensive.

 

Here is the bulletin. I hope this helps clarify.

 

Also, I checked and part 126166 is the updated coupling installed on my car. It is the version that does *not* have the hole drilled already.

 

Thanks -- #464 seems like the more general version of Service Bulletin 10-15 (seems the same information and nearly the same date -- although, in #464, they do confess that they did something "precautionally adopted" that turned out to be troublesome and "proved to be unnecessary" ). Service Bulletin 10-15 noted as applying to only "North American" cars while #464 applies to more markets.

 

The ones with a predrilled hole were very short lived and have not been available for a long time. They were all the 126166 style and were drilled here by a machine shop in New Jersey. When those were being done under warranty FNA had some drilled to reduce warranty costs. Not all 126166 style were drilled.

 

Where did you get that? Our bulletins as I recall all came out of FNA and said so. Also that is a numbering system I am unfamiliar with. In 86 our bulletins would have been numbered 10-xx for one related to the engine.

 

The Service Bulletin 10-15 looks much more in the FNA format/style of things from that period to me and in better English -- but just doesn't say "FNA" anywhere.

 

You're right, my memory was faulty. They did not say it in that period but the format and numbering isn't what I would expect to see. Every few years someone new was in charge and reinvent the whole numbering system and format.

 

Thats what we have been getting for a long time. Just be sure it is clocked correctly before drilling.

 

When I was shopping for the part, the ones pre-drilled were about triple the cost of the ones not pre-drilled.

 

Rutlands sent it to me.