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1967 Rear Brake Cover Plate 68-6130 - Bore #305455
03/29/10 5:20 pm
03/29/10 5:20 pm
Joined: Jun 2009
Posts: 292
UK
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CAB Offline OP
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CAB  Offline OP
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Joined: Jun 2009
Posts: 292
UK
Hello
I've just purchased an aluminium rear brake cover plate (68-6130) as the last part needed to complete my Spitfire rear hub assembly. I have also purchased a new drive side spindle (68-6121) that goes through the brake drum bearing and cover plate. Except that it doesn't, the bore of the hole through the cover plate is too small to pass the spindle through.
I guess that BSA used this casting on different models with different size spindles. Could someone please confirm the size of the bore through their cover plate and if possible the depth of the bore (just in case the central raised boss is machined to a different length) as well?
Thanks in advance.
CAB.

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Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: CAB] #305466
03/29/10 6:51 pm
03/29/10 6:51 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Posts: 7,813
Seattle
Welcome to the wacky, wacky world of QD hubs. They may all look the same but they're all so very different.... I have yet to have seen a definitive explanation of all the variants.

I'll see if I can measure the one on my Hornet tonight.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: Alex] #305496
03/29/10 9:53 pm
03/29/10 9:53 pm
Joined: Jun 2009
Posts: 292
UK
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CAB Offline OP
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CAB  Offline OP
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UK
Thanks Alex
Looking at the bearing specs (65-2045) I think it should be 25mm internal diameter (25mm x 52mm x 15mm).
I just hope that the internal and external boss on the brake plate are standard so that the chain alignment is correct when it is bolted to the swinging arm. The face of the internal boss stands off the internal cast face of the brake plate by approximately 8.5mm. The total length of the bore is approximately 26.2mm.
My QD hub has a right hand thread on the speedo drive end, most people think that this should be a left hand thread. Any ideas?
Regards
CAB

Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: CAB] #305542
03/30/10 5:33 am
03/30/10 5:33 am
Joined: Dec 2002
Posts: 3,252
arkansas
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leon bee Offline
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arkansas
I also have a hub with RH threads, so there are some others out there.

Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: leon bee] #305632
03/30/10 6:28 pm
03/30/10 6:28 pm
Joined: Jun 2009
Posts: 292
UK
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CAB Offline OP
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CAB  Offline OP
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Hello
I thought it was just me....
What year of bike is it on?
CAB

Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: CAB] #305643
03/30/10 8:30 pm
03/30/10 8:30 pm
Joined: Oct 2007
Posts: 1,537
Auckland NZ
Ignoramus Offline
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Ignoramus  Offline
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Auckland NZ
There was a thread on here ages ago which showed the 3 diffrent spindles....good luck with the search button i cant find it.

I think 2 of the smaller bore plates were used on Triumphs?.

And yep RH thread quick realse axel here too. (1970)


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: Ignoramus] #305662
03/30/10 11:08 pm
03/30/10 11:08 pm
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
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Gordo in Comox Offline
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Comox BC Canada
Beware of the various versions;

Here are the two plates. On the left is the small hole and on the right the larger hole. Both measure about 26mm deep through the hole for the chain alignment.



Here is the inside view.


The other trick is the stub axle. From left to right is a pre-unit (needs plate mod to use the alloy plate), B44 type with area for slip-on chain adjustor outside swingarm, longer type for small bearing diameter and finally later A65 type with larger diameter for larger bearing.



Without frequent roadside repairs there is no fun in riding!
Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: Gordo in Comox] #305771
03/31/10 5:06 pm
03/31/10 5:06 pm
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Posts: 292
UK
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CAB Offline OP
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CAB  Offline OP
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C
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Posts: 292
UK
Thanks for the reply Gordo.
The spindle that came in the box of bits is the same as the one on the left, I have just bought the one on the right with the corresponding bearing. I didn't know that the one 2nd from the right was available. Do the right hand pair have the same thread? If they do then all I need is the one 2nd from the right as the bearing in the drum feels fine and I won't have to get the plate machined. Do you have a part number for it?
Thanks again.
CAB

Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: CAB] #305780
03/31/10 5:59 pm
03/31/10 5:59 pm
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
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Gordo in Comox Offline
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Comox BC Canada
CAB; You did not say which long spindle you have. The "fat" spindle on the right above has a larger inside thread than the others so it needs the fat thread long spindle. Which long spindle do you have?

I do not know when the A65 first used the alloy brake plate. My guess is it started for the 66 or 67 model year and that it could have initially used the spindle second from the right above then switched to the fat version. I do not have a 67 parts book to compare (I only have 65,66 and 68).

If it started in 66 then the parts drawing is wrongly still showing the steel plate but the number on the stub spindle is 68 6067. A good number of photos in Bacons BSA Twin Resto book show the alloy plate on the 67 models. The text states that there was a new brake plate for 66 and another for 67. (small and large hole?)

Gordo



Without frequent roadside repairs there is no fun in riding!
Re: 1967 Rear Brake Cover Plate 68-6130 - Bore [Re: Gordo in Comox] #305811
03/31/10 9:39 pm
03/31/10 9:39 pm
Joined: Jun 2009
Posts: 292
UK
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CAB Offline OP
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CAB  Offline OP
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Posts: 292
UK
Hello Gordo
I have the long spindle to suit the short spindle on the far right (but this is new as well as are all the bearings). The easiest thing to do now is to get the hole in the brake plate opened out to suit the new short spindle rather than send all the new bits back for exchange. I can get this doen now that I know the length of the bore is the same. Do both the inside bosses stand off the same amount from the inside cast face?

I have the 1966 & 1967 parts book and the 68-6130 (far right spindle above) is listed for 1967. I'm not sure if the rear hub/brake drum that came with the bike are the original ones. I thought it was a 1967 hub as it had a right hand thread on the speedo drive side and no grease nipple. I had to order a new speedo drive/cover plate with a right hand thread and the part supplied by Burton Bike Bits matches the part number in the 1967 book. When I stripped it down it had two washers either side of the felt washer as per 1967; the 1966 book shows only one. Most of the bits supplied with the bike are correct for the 1966 model (Goldstar type front brake, GP carbs the engine and frame numbers match the original log book). I just have the feeling that it might have been fitted with some 1967 parts from new as it has a high frame/engine number and alledgedly came with the original mudguards which are 1967 types.
Thanks for all your help, it is much appreciated.
CAB


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