Author Topic: Fitting A7 long stroke cam followers  (Read 1606 times)

Online bikerjohndavies

  • John Davies, Bath, UK
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  • 1953 BSA A10 Super Flash
Fitting A7 long stroke cam followers
« on: 28.09. 2010 10:33 »
Does anybody know the correct way round to fit A7 long stroke cam followers into the 1 exhaust and 2 inlet tappet blocks ? The followers have one side face curved and the stem is off centre so there must be a correct and an incorrect way round. I have looked in the BSA service sheet 208 but no mention of which way round they go.
Thanks, John
1931 Ariel VB31, 1935 Triumph 5/3 project, 1946 Ariel Square 4, 1952 Norton Model 7, 1953 BSA A10 Super Flash, 1954 Ariel VH

Offline Rusty nuts

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Re: Fitting A7 long stroke cam followers
« Reply #1 on: 28.09. 2010 18:30 »
John,

Never noticed an offset!

Curved to outside, flat inside. Should be self evident.
 The "curve"  can sometimes bind on tappet block, in which case you can file down.
Or (flame jacket on) you can also just rotate 180 degrees fit the other way round as long there is clearance.
 Though I'm sure some would opine this affects pressurisation (of their anoraks)

Rusty:)
1949 A7 Plunger
1947 A7 Rigid Star Twin
1969 Triumph T120R
1972 Triumph T120V

Offline Stephen Foster

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Re: Fitting A7 long stroke cam followers
« Reply #2 on: 04.04. 2014 10:13 »
I wonder if that could be clarified please as I may be misunderstanding ?
 1/ Should the central pair be fitted with the slight curve facing outwards ?
 2/ Should the outer pair be fitted with the slight curve also facing outwards please ?

I ask this as if I look down onto the cam lobe the outers appear to make slightly more contact with slight curve of the cam followers facing inwards ?

Is it possible that it makes no difference which way round the outer pair are fitted & that the curves were produced this way for the sake of uniformity (same part number ) , etc ?

As I am due to fit the cylinders I need to be certain , I have been unable to find any information on this point ?

Thanks in advance ,
Steve .
I own a 1955/56 B.S.A Swinging Arm "Golden Flash" , had it since 1976 .