Norton 16h half time pinion

[gary0003]

Hi, can anyone please advise me which way round the 1/2 time pinion should be fitted to my Norton 16H please, and should it have a washer behind it? I currently have one new from India and have fitted it with the dished side (concave) inwards.

Thanks

Gary.

[welbike]

Does it have 3 keyways?? I wouldn't trust an Indian made one in such an important part of the engine, these parts can still be found original, or even NOS, can't remember a dished side on it, had one in my hand last thursday!

Cheers,

Lex

[79x100]

It should be fitted with the relieved, concave area inwards. It sits tight against the shoulder on the crankpin.

The teeth on the outer edge of the gear are bevelled and this face is behind the oil pump worm. It might seem logical for Norton to have relieved the back edge to make it easier to use a puller, but they didn't..on later engines though, the opening in the case is large enough for the pinion to be left in place when the crank is removed. On earlier engines, it wasn't and this area is frequently found with damage to the bearing housing.

Edited August 15, 2022 by 79x100
Clarification

[gary0003]

Thanks, that’s great. 
Gary