You can see the crumbling remains of the K7 tensioner
blade and spring below.
There are actually 3 springs, 2 pins and one sliding
blade support that make up this system. The 3 springs are, of course, the blade
itself that bears against the chain and the tension spring that is stretched between
the 2 pins at either end, but also a thin sheet steel spring that retains the
sliding blade support in its slot but allows its lateral movement. All of these parts
(new ones!) are shown below.
By an amazing piece of luck, when I phoned the company
that I have always used for making springs, namely Alberta Springs in
Colchester, Graham, who owns the business and is springmaker-in-chief, told me
that not only had they had made these before, but even had drawings! Sure
enough, a couple of weeks later a new set of 3 perfect springs turned up in the
post. Since the time when these springs for the K7 were made, Alberta have also
made further sets of these chain tensioner springs for the subsequent AJcette and V-twin
projects ….but more of these at a later date.
The picture below shows the new installed complete drive
system for the overhead camshaft.
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