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Advice On Reinstalling Clutch on '74 mk2a

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Parts referred in this post are named as they are in the AndoverNorton web site with URL immediately following.

https://andover-norton.co.uk/en/shop-drawing/65/chaincases-chains-sprockets-clutch-alternator

I am having trouble installing the Clutch Spring Retaining Circlip (52).

Please excuse the wordy description that follows, done so there is no ambiguity about which parts I am talking about.

I have fabricated a Diaphragm Compressor Tool 060999 ,See Attached Photo Please, (FigC13 in the Workshop Manual For Norton Commando 1973 Copyright) and can't seem to flatten the Clutch Diaphragm Spring (46) adequately to position the Clutch Spring Retaining Circlip (52) into the  circumferal groove in the Clutch Chainwheel C/W Backplate (06.0742)

Ideas please.

Ron Wellman

Midland MI USA

 

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If it is, then you "wind" the spring in from one end. You may have to tap the last couple of inches into place to seat it properly.

If not, then it's possible the clutch pack is too thick? That compressor looks fine - I made mine out of a length of large diameter tube.

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Hi Ron

I had a similar problem when I did mine for the first time, perhaps made a little harder because I put a 3mm plate in to help lighten the clutch.

I think where I went wrong is that I overcompressed the spring, perhaps out of fear of the spring! When the spring is too flat the opposing spring tangs seem to act in different directions causing the spring to distort from the flat. I succeeded in the end by uncompressing the spring a little so that it became slightly concave and went flatter at the edge. This enabled me to feed the retaining clip back in. When back in push against it with the flat of a screwdriver to make sure it is really home. When adjusting the spring, just make sure that the centre bolt is properly locked into the hub so that it cannot possibly come undone when you adjust the spring.

It did take a lot of careful fiddling, but was actually easy when the spring was the right shape. I’m sure you will get more experienced replies- but we all do it for the first time at some point! good luck

Steve

Thanks Ian,

The clutch pack is the same one that came out when I took it apart. Foolish me, at the time I thought, incorrectly, that I had to disassemble the clutch pack. Big "oops" on my part.

Just in one small area, perhaps 60 degrees, the pressure plate is clear of the groove. I will try harder to work the retaining clip into the groove.

Glad to see others have this problem too.

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On the retaining clip there is a small cutout at the end - when the clip is nearly completly in get a screwdriver inserted in the cutout and either a sharp tap with a hammer or the palm of your hand should ensure the clip is well seated in the groove. You should be able to see if it is correctly seated all the way around by the amount left showing. The above assumes that you have the clutch tool correctly used on the spring to give you full acess to the grove for the clip.

Regards - Paul.

 

 

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