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Redditch QD full width rear hub wobble

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Redditch QD full width rear hub wobble
Started at 02:26pm on the 9th July, 2018 by Chris Tindal
Chris Tindal Subject: Redditch QD full width rear hub wobble
Has anyone rebuilt a late Redditch full width QD rear hub lately? My rear tyre had cracked side walls and a small amount of lateral rocking of the wheel, resulting in rather interesting handling. I’ve totally stripped the rear hub and put on a new tyre as well as new hub bearings, sprocket drum bearing, brake shoes and cush drive rubbers, all of which looked like they hadn’t been touched for 60 years. Upon reassembly there is still a bit of lateral wheel movement. It seems that the locking ring studs are a fraction too long. They are shouldered to prevent the cushdrive shell pulling too tight onto the cush drive rubbers, which would prevent the intended fore and aft movement. It seems these studs are a little long, so that when the nuts are fully tight, the ring and the cushdrive shell have about 2mm of play, causing the shell to rock against the sprocket drum. It looks like it’s always been like this but can’t have had side rock of the wheel originally or else it wouldn’t have got through an MOT. Have I understood the assembly properly? Is there something I’m missing?
Posted: 02:26pm 9th July, 2018
Mark M Subject: Redditch QD full width rear hub wobble
Chris, I don't know about the over-long studs but I did have a similar problem on my 350 Trials (significant that it is a Trials, as you will see!) which turned out to be that the shell on the back of the sprocket assembly on which the locating pins on the hub bear, was worn. You would think the spindle when tightened would take up the slack but this doesn't seem to be the case. I replaced the shell and the pins although I don't think they were worn, being steel and harder than the cast iron of the shell, and all was well again. I mentioned that it was a Trials machine and my theory was that mud or sand had entered the joint and acted as grinding paste but who knows!

REgards, Mark
Posted: 03:45pm 9th July, 2018
Chris Tindal Subject: Redditch QD full width rear hub wobble
Of course, the shell moves backwards and forwards against the sprocket hub so will eventually wear. The shoulder on the pins prevents them taking up the slack so it will start to wobble, I get it now. Oh well, I guess 60 years has taken its toll, another new part to 'shell' out on. This bike has fought me every inch of the way, hopefully this is the last thing to fix. Thanks Mark.
Posted: 08:17pm 9th July, 2018
Mark M Subject: Redditch QD full width rear hub wobble
Chris, that is how I feel about the Series 2 Interceptor at the moment! Latest problem is that a large section of one of the cylinder bores has 'de-laminated' away from the parent metal. It's a known casting flaw caused apparently by an interrupted pour of the molten metal or a cold mould. I'll post a pic when I can find the time. It has pushed the gudgeon pin across and broken the circlip which has crushed the oil control ring and destroyed the piston. I will have to take the whole engine apart to check and clean it. And with only 600 miles on it. Oh well, probably no surprise with a bike built from several boxes of bits!

REgards, Mark
Posted: 09:00pm 9th July, 2018
Adrian Subject: Redditch QD full width rear hub wobble
OUCH!!!

Can the barrel be re-sleeved, or is it replacement time?

A.
Posted: 12:48pm 10th July, 2018
Mark M Subject: Redditch QD full width rear hub wobble
I'm in the pocess of getting it sleeved along with a spare if required. Pistons will be expensive and l don't know what else is damaged yet! REgards, Mark
Posted: 05:14pm 10th July, 2018

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