Just resurrecting this one:
I have a 1965 TR6SR and the PRT 'system' has thin metal cups below the lower white washer. Is the arrangement described in Service Bulletin 329 mentioned above directly interchangeable?
The tubes do look quite different, but maybe all the dimensions are compatible.
Checking out a couple of suppliers does not answer my question:
According to the 1966 parts list, my pushrod tubes are 70-6000. The later ones are 70-9349.
Over at LP Williams, they seem to show nearly identical items for both part numbers. The 6000 equivalent is not at all like mine at either end.
At least they both appear to be chrome-plated steel.
Over at Tri-cor they show an alloy
tube for both part numbers:
The 6000 does look like mine except that it is alloy, whereas mine is chrome-plated steel and is flanged/swaged (??) at the bottom to compress the white washer, whereas the alloy one looks like it has a machined band for that. There again, the tubes do look quite shiny, so perhaps they are really "tubes for alloy pushrods".
Perhaps I should also ask, assuming that I can 'upgrade', did the modification actually solve the problem? The current fitting, the flat-ended, flanged steel tube resting on the white washer retained by a thin cup certainly doesn't inspire confidence. But I wonder.
(Constantly at the back of my mind is the 1964 ex-police Triumph Saint I had for a couple of years in my late teens with well over 40,000 miles on the clock – it may have been a lot higher – which never leaked anywhere and always started second kick. That must have been around 1968-9. So why is it all so different now? Maybe it was the big black Avon fairing keeping the weather off. Ho, hum…)