Well Known and Active Website User
Can anyone tell me positively what the angle is (or included angle for a pair) of the splits collets on the top end of the valve stems. Trev? Ian Savage? Anyone?
Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.
You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.
If you have previously registered to use this forum, you should log in now. CLICK HERE.If you have never registered to use this website before, please CLICK HERE.
Roberto,Can anyone tell me positively what the angle is (or included angle for a pair) of the splits collets on the top end of the valve stems. Trev? Ian Savage? Anyone?
Yes very strange -the spring cap was steel and I think I can trust one of my Hero's Freddie Dixon* to get the angles right. Perhaps it was just the years it had sat there...Thanks Tim, for the photos, my guess the spring cap was the reason for this defect. They did not get collets with correct taper for the spring cap, or the stem groove did not match the collet shape - or the spring cap was too soft brass or alu. The single groove types come in several different types, see my photo. But I would not pick them as that type of collets leave a gap and squeeze the stem - unlike the three groove precision No. 22 MK8-H collets with no gap. So their perfect taper spreads all loads evenly and should go well with alu caps. Anyway, either types are produced and installed in millions of engines without problems. In your case I can imagine that the collets digged into the soft spring cap at the top edge to form a substantial ridge that prevented easy disassembly - my theory. The printed sample of collets is in a TRW book , more than 20 forms in there - but definitely no combo with a tiny wire clip.