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Model 50 Half Time Pinion removal

Submitted by michael_jones1 on Mon, 04/05/2020
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Hi All,

I'm new to British bikes but have always hankered after a Norton. In lockdown, so have finally started restoring a 1956 Model 50 basket case which I bought over a bottle of wine or two whilst perusing Fleabay a while ago. Always a bad move! I thought that I'd bitten of more than I could chew, the delights of whitworth almost stopping me in my tracks, but then I recently joined the NOC and have found the forum immensely helpful. 

As my bike literally came in a few boxes of bits plus a frame, I thought it prudent to split the crankcase to check all is well. Everything was going according to plan until I got to the half time pinion (P./No. C2/58 on plate A, item 56). For the life of me, I cannot remove this. I've tried a 3 legged gear puller with no visible effect. Am I missing something or do I need to apply more brute force than I have already?

Thanks in advance,

Mike

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Norton M50 Crankcases.jpg

Submitted by ian_soady on Mon, 04/05/2020

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... you have removed the oil pump worm drive (left hand thread) then the gear should just pull off. I believe that the type of puller used for Norton Commandos will fit but can't be sure as I've lent mine to my brother to use on his AJS. Sacrilege I hear you say!

Submitted by richard_tool on Mon, 04/05/2020

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Hi Michael - the puller is the way to go . I assume you have removed the oil pump drive first . When using puller be certain to use protection over the end of the shaft as this mates up to the oil jet in the timing cover and you don’t want to burr up the mating surfaces , or worse yet  split the end of the crank . Application of heat to the pinion may be necessary to expand it . If you have access to an induction type heater these work best - they come with sets of cables to go around the stubborn part , in your case the pinion . They are expensive but perhaps you can rent one or borrow. A torch used judiciously may do it but the problem is they tend to heat the shaft as well .

Hi. 

Thanks very much. Yep, I've already removed the worm drive and protected the end of the crank. The amount of force that the puller was applying was starting to concern me. Unfortunately I only have a blowtorch. I'll give it another go and let you know how I get on.

Thanks again,

Mike

 


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