I have an 1960s BSA C15 which I have tripped down, the swinging arm pin was very tight in the main frame hub requiring heat, a big hammer and a punch to extract it. The pin would need freezing and heat on the hub to replace it.
The pin is a good fit in the swinging arm bushes and the swinging arm was free with negligible play.
My queries are this:
First should it be that tight in the hub ?
Secondly what is the purpose of the grease nipple in the hub? there are no channels or bores for grease to get to the machined grease ways in the ends of the pin, the holes in the grease ways go only to the internal threads of the end bolts (no grease nipples in the end bolts).
I'm ready to reassemble the frame so any help on this would be greatly appreciated.
exactly the same as the B40 Ive been working on apart from the spindle in ours had nipples in both ends. had to use a hydraulic press to push the spindle out. for the cost of new bits Ive replaced bushes, spindle and nipples. should be a slide fit , it moves freely now.
ours didnt have a nipple in the cast swing arm, as no way of it getting out, I just packed it well with new grease on assembly.
my guess, someone replaced the bolts with earlier un nippled ones, its easy enough to drill the bolts and you can get 6 nipples on the bay for somewhere around a fiver.
for belt and braces, if you can find one, fit a niple in the arm as well.
My B40 has a nipple in the frame and one at each end of the pin.
The pins are very tight and it does make shimming up the swinging arm a bit more awkward if the pin has to be pressed out while shimming.
I put a new pin in my B40 a couple of years ago.
I put a reamer through the frame to make the pin a tightish slide fit then drilled & tapped a couple of holes underneath to lock the pin in place having ground a couple of small flats on the pin. Makes shimming & removing the pin at a later date much easier.
Cheers, Dave.
Thanks for that appreciated.