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kerbsideMon Sep-15-08 04:35 PM
Member since Mar 18th 2009
1 posts
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"exhaust insert tooling"


  

          

Hey Guys, anyone know of a supplier of the "helicoil" tools used on the norton exhast threads? Cheers

  

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dynodaveThu Sep-18-08 04:45 PM
Member since Mar 18th 2009
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#1. "RE: exhaust insert tooling"
In response to Reply # 0


  

          

Why not just get the tool from your supplier of the helicoils themselves?
I repair my heads with threaded aluminum inserts.

  

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johnandnzThu Sep-25-08 04:38 PM
Member since Mar 18th 2009
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#2. "RE: exhaust insert tooling"
In response to Reply # 1


  

          

There is a shop in Wellington NZ that instals the helicoils but I know they had the tap made here. I beleive it was really expensive so they made one.

I know Dave uses inserts but my own experience with helicoils is very good. I only have them on a featherbed frame bike not a Commando but it is a race bike and the exhausts are on and off all the time. They have lasted 6 years with no sign of trouble.

The best thing about the fix it that it can be done in a few minutes. Bolt up a jib to the frame to hold the tap square, run the tap in, clean out the thread and put in the helicoil. All done in 20 mins a side for around US$25 plus the helicoil.

  

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TritonSun Apr-19-09 03:42 AM
Member since Apr 19th 2009
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#3. "RE: exhaust insert tooling"
In response to Reply # 2


          

Not sure if this is still a hot topic, but...

I'm just repairing the exhaust threads in my '71 Commando SS head and I'm trying out the inserts that are available from Norvil in the UK.

They are simple threaded 'collars' that are welded into the head, after the old, damaged threads have been machined out. Should be as strong (if not stronger) than the original threads and undetectable in use.

I'll also be using the Norvil brass exhaust nuts - apparently they stay tight, we'll see eh!

  

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