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Author Topic: Clutch pushrod lengths  (Read 404 times)

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Online chaterlea25

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Clutch pushrod lengths
« on: February 22, 2016, 10:21:25 PM »
Hi All,
Somewhere or other I came across these pics of a table of clutch pushrod lengths for the various BSA models

HTH
John

Offline timsdad

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Re: Clutch pushrod lengths
« Reply #1 on: February 23, 2016, 06:34:04 AM »
That's an interesting chart, John, - I haven't seen one of those before. I presume the original is life size and could be stuck on the counter or hung on the dealer's wall.

Ray
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Online Owen

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Re: Clutch pushrod lengths
« Reply #2 on: February 23, 2016, 07:53:15 PM »
Good detail. However, seems a little odd with the years/ gearbox.

I have 10.0625 (10 1/16") for 29-3643
1945 C10 & C11
1953 C10
1953 C11 x 2
Still looking for an Original 350 side valve C12

Offline timsdad

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Re: Clutch pushrod lengths
« Reply #3 on: February 24, 2016, 07:32:46 AM »
I'd guess this chart is the correct one because of the way the measurement matches up with the ones below and above it, Owen.


In case you need them, I have the 1940 3-speeders as :

C10 and C11 pushrod   29-3791 at 9"

C12   29-3792 is 9.20"


Ray
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Online chaterlea25

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Re: Clutch pushrod lengths
« Reply #4 on: February 24, 2016, 07:47:50 PM »
HI Ray, Owen and All,
Looking closely at the second photo there appears to be a lip on the left hand edge ?
and it reads "gauge" so I think it maybe made of metal?
First I thought it was a paper print ???

John

Online Owen

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Re: Clutch pushrod lengths
« Reply #5 on: February 24, 2016, 08:39:01 PM »
This is what I have found

   Clutch Pushrod Sizes                  
                     
Part No.   Size       Imperial   Metric    Model        Gearbox        Type                   Year          ? Years
                     
29-3475   9 17/32”   9.53125"   242.09 mm   C10L/C1G 3 speed   Standard           54-55        54-57
29-3477   11 9/32"   11.28125"   286.54 mm   C11G        4 speed   Heavy Weight   54-55        54-57
29-3643   10 1/16”   10.0625"   255.59 mm   C10L/C12  4 speed   Light Weight   56-57   
29-3795   8 7/8”   8.875"   225.42 mm   C10/C11   3 speed   Standard           50-53        49-53
29-3791   9”           9"           228.6 mm   C10/C11   3 speed   Standard           46-49    47-52
29-3324   10 5/8”   10.625"   269.87 mm   C10/C11   4 speed   Heavy Weight   51-53?   49-53
29-3792   9 1/5"   9.200"   233.68 mm   C12          4 speed       Light Weight      ?
1945 C10 & C11
1953 C10
1953 C11 x 2
Still looking for an Original 350 side valve C12

Offline timsdad

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Re: Clutch pushrod lengths
« Reply #6 on: February 25, 2016, 06:17:47 AM »
I may be getting a bit picky but the last one, 29-3792, should also include 3-speed standard, C12, 1940 only.

Ray
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Online Owen

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Re: Clutch pushrod lengths
« Reply #7 on: February 25, 2016, 05:06:14 PM »
Ray,

Does the real C12 use the same 3 speed gearbox as the pre-war C's and therfore the same length clutch push rod?
1945 C10 & C11
1953 C10
1953 C11 x 2
Still looking for an Original 350 side valve C12

Offline timsdad

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Re: Clutch pushrod lengths
« Reply #8 on: February 26, 2016, 07:17:43 AM »
The gearbox is the same, Owen, but the clutch has an extra plate so the chain wheel is a bit wider and therefore the clutch push rod has to be longer. That's why the 350 and 250 push rods have a different part number.

There is so little adjustment on the lock nut and screw adjusters in these early three-speed boxes that the push rod length is quite critical to get the lever and cable angles right for the best clutch action.

Ray
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