Video of Exhaust Thread Repair

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Duccout
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Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Video of Exhaust Thread Repair

Postby Duccout » Tue Nov 02, 2021 4:17 pm

Here is a You tube link to Mid Engineering repairing my exhaust port thread. No wonder engineering is so expensive! https://youtu.be/amVLHsos48U

Colin

blaat!
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Joined: Thu Aug 25, 2011 4:31 pm
Location: Massachusetts

Re: Video of Exhaust Thread Repair

Postby blaat! » Tue Nov 02, 2021 10:55 pm

That's cool. I always respect people who are not deterred by tricky task without precedent.

Duccout
Posts: 888
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Video of Exhaust Thread Repair

Postby Duccout » Wed Nov 03, 2021 7:13 am

Yes, Gary, the guy in the video repairing the head, will tackle anything, he is a proper old-school engineer. Unfortunately, here in Britain, those sorts of engineering shops have almost disappeared; when I was young they were everywhere but times change........When I was walking around Valetta a few years ago, I peered through an open door and inside was a workshop, full of machinery, and a gnarled old guy was working on something metal....... I almost popped in to say hello, but he probably would not have appreciated it!

Colin

Ducadini
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Joined: Sun Sep 24, 2017 9:02 pm

Re: Video of Exhaust Thread Repair

Postby Ducadini » Sat Nov 06, 2021 4:51 pm

Decades ago, a mate (who "occasionally" worked on Ducati's) had a 750 SS in his shop, front exhaust thread gone (this wasn't the only thing that was butchered, we later found out). We took the head off and on his daytime job, machining at a food packaging plant, he had a complete machineshop at his fingertips. While he machined the head, his colleague made the alu ring to fit . Day later, bike ran again. Two days later, I bought it :D :D .
Always admired his work (and the way he could put those big machines to good use : repairing Ducati's finest).

ciao
ducadini

DBDBrian
Posts: 167
Joined: Mon Mar 30, 2015 11:29 pm

Re: Video of Exhaust Thread Repair

Postby DBDBrian » Sat Nov 06, 2021 5:33 pm

Yes a very interesting article, but for whatever reason, I am unable to locate part two ?
Brian
Made in England

Duccout
Posts: 888
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Video of Exhaust Thread Repair

Postby Duccout » Sun Nov 07, 2021 1:40 pm

Part 2 is pending.......

DBDBrian
Posts: 167
Joined: Mon Mar 30, 2015 11:29 pm

Re: Video of Exhaust Thread Repair

Postby DBDBrian » Sun Nov 07, 2021 2:58 pm

Thanks Colin, look forward to it.
Brian
Made in England

Duccout
Posts: 888
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Video of Exhaust Thread Repair

Postby Duccout » Sun Nov 14, 2021 3:08 pm

Part 2 now posted!

Duccout
Posts: 888
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: Video of Exhaust Thread Repair

Postby Duccout » Tue Nov 30, 2021 6:52 am

Part three now posted.

DBDBrian
Posts: 167
Joined: Mon Mar 30, 2015 11:29 pm

Re: Video of Exhaust Thread Repair

Postby DBDBrian » Wed Dec 01, 2021 8:19 pm

That was certainly interesting to watch, with a successful outcome. Fortunately the exhaust thread was OK in the head I used with my rebuild, but after watching the video, I gave the ex thread issue a bit of thought as to how to overcome the situation, if ever I was confronted with the same problem.
I think my approach would be to try and reclaim the damaged, by screw cutting it oversize in the lathe, or if that was not possible, bore the head, and screw cut a completely new thread. Then make an oversize sleeve nut to suit in either event.
It would require a bit of scheming to mount it in the lathe, and would be a time consuming job, but it would overcome the need for welding.
I have repaired quite a few damaged threads in BSA 190 mm front brake drums using this method.
Just a thought on the matter.
Brian
Made in England


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