vincereynard wrote:Anyone on a Triumph forum that shows this is a regular problem?
Yes.
http://www.triumphexp.com/phorum/read.php?8,954741http://club.triumph.org.uk/cgi-bin/foru ... 398778702/I am sure there are many others. The first thread gets to the point quickly though, and it's the one I first read that alerted me to the problem:
"Microscopically if you examine the surface finish of where the thread has been cut, it will demonstrate thousands of micro fissures which are all called stress raisers.
In the part of the thread that breaks it's always close to the top and facing in, so has the maximum loading under cornering.
That's wear the flexion causes the stress raisers to turn into vast crevasses." vincereynard wrote:If that article was correct - " the Triumph upright remains in manufacture today, by Coventry company ESP Ltd using refurbished original tooling."
That said, they are discussing an upright that was commonly available at the time, made overseas with a "BS" logo cast into it. As you can see from the picture at the top of the thread, the machining is simply dreadful. My uprights only show poor machining at the base of the thread, but that is exactly where it will fail so the fact that the rest of the thread looks good isn't much consolation.
Looking at ESP's Google info, it appears to be a motor factor now, not a manufacturer. I'm not sure they are the maker, although Canley said they are made in Coventry. I called them and sure enough, they're a wholesaler only.
vincereynard wrote:It worries me a bit as Toad was bought with all new front end fitting by the Peterborough bunch. I doubt there was much quality assurance there.
The only way to know is to take the front suspension apart yourself, then clean and examine the kingpin thread for poor machining.