Author Topic: torque settings?  (Read 1112 times)

Offline mistergee

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torque settings?
« on: 19.05. 2017 14:19 »
New member on here, so hello all.
inherited my dad's A7SS 12 years ago now and have been keeping it rust free with FS365 and dry storage all that time, however it is going for MOT shortly and as i've had the forks off to replace head bearings and oil / oil seals etc, I cannot find a list of torque settings any where.
Am I missing something? the only ones i've seen are service sheets for A10 models and there don't seem to be many settings in those. nothing in the owners manual or haynes that i can see.
if you have any info or can point me at it i'd be really grateful (& safer)

Online Billybream

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Re: torque settings?
« Reply #1 on: 19.05. 2017 17:25 »
Hi.
You will struggle to find any torque settings for the A7/A10.
I have used typical settings off A65 as a guide for same thread size

Torque wrench settings (Dry)
BSA A50 & A65 Unit Twins                1962-65    1966-68    1969-70
Flywheel bolts                                 30lb/ft    30lb/ft    45lb/ft
Connecting rod nuts                         22lb/ft    22lb/ft    22lb/ft
Cylinder head bolts 3/8"                    25lb/ft    25lb/ft    28-30lb/ft
Cylinder head bolts 5/16"                   25lb/ft    25lb/ft     
Cylinder head nuts 3/8"                     26lb/ft    26lb/ft    31-33lb/ft
Cylinder barrel nuts 5/16"                  18lb/ft    18lb/ft    18-20lb/ft
Oil pump stud nuts                            7lb/ft    7lb/ft    8-10lb/ft
Clutch centre nut                       70-75lb/ft    70-75lb/ft    65-70lb/ft
Kickstarter ratchet nut                      60lb/ft    60lb/ft    55-60lb/ft
Rotor fixing nut                                60lb/ft    60lb/ft    60lb/ft
Stator fixing nuts                          10-15lb/ft    10-15lb/ft    5-7lb/ft
Crankshaft pinion nut                       60lb/ft    16-18lb/ft
Carburettor flange nuts                    10lb/ft   10lb/ft    10lb/ft
Manifold stud nut 5/16"                    12,5lb/ft    12,5lb/ft     
Manifold stud nuts 1/4"                    6lb/ft    6lb/ft    6lb/ft
Zener diod fixing nut                        17lb/ft
1960 Super Rocket, owned since 1966, back on the road 2012 after being laid up for 29yrs.

Online BSA_54A10

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Re: torque settings?
« Reply #2 on: 21.05. 2017 11:15 »
New member on here, so hello all.
inherited my dad's A7SS 12 years ago now and have been keeping it rust free with FS365 and dry storage all that time, however it is going for MOT shortly and as i've had the forks off to replace head bearings and oil / oil seals etc, I cannot find a list of torque settings any where.
Am I missing something? the only ones i've seen are service sheets for A10 models and there don't seem to be many settings in those. nothing in the owners manual or haynes that i can see.
if you have any info or can point me at it i'd be really grateful (& safer)

When your bike was made a torque wrench was a mythical tool supposedly found hanging on the walls of top competition tuners.
There were none used at the factory except for the big end shells.
Thus there are no factory torque figures.
When it comes to tensioning bolts 1/3 of the home mechanics have no idea what they are doing
The other 1/3 have wrenches that are so far out that they are useless .
And the last 1/3 spend years trying to find out what they should be then sent the engine out to be assembles.
Bike Beesa
Trevor

Online Greybeard

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Re: torque settings?
« Reply #3 on: 21.05. 2017 12:31 »
When it comes to tensioning bolts 1/3 of the home mechanics have no idea what they are doing

I've seen tyre fitters using torque wrenches; the wrench clicks and they give it another push to make sure, (that you will not be able to undo the fixings with your in-car tool!)  *sad2*

Online Black Sheep

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Re: torque settings?
« Reply #4 on: 21.05. 2017 14:22 »
Perhaps not quite so arcane as thought in the old days. Note that spanner length increases correspondingly with nut size. A 3/8" WW spanner is longer than a 1/4" WW for instance. The intention there is that the same amount of effort will provide increasing torque applied to larger nut/bolt sizes. So only the ham-fisted or those using unsuitably long spanners were likely to seriously over-torque nuts and bolts.
Watch period film of bikes being built and there's not a torque spanner in sight.
2 twins, 2 singles, lots of sheep

Offline muskrat

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Re: torque settings?
« Reply #5 on: 21.05. 2017 14:28 »
The only bolts I use a tension wrench on are the big ends and the head. I use a rattle gun on the cush, clutch and lay shaft nuts. 1/4" nuts & bolts are 3 fingers, 5/16" are one grunt, 3/8" are a grunt and a bit, anything bigger gets two grunts. The steering head adjusting sleeve is by feel, just enough to eliminate any play in the bearings.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, .
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Online Greybeard

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Re: torque settings?
« Reply #6 on: 21.05. 2017 15:38 »
1/4" nuts & bolts are 3 fingers, 5/16" are one grunt, 3/8" are a grunt and a bit, anything bigger gets two grunts.
More arcane Ozzie measurements.

Offline RichardL

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Re: torque settings?
« Reply #7 on: 21.05. 2017 16:43 »
In addition to all this information, I think it would also be a good idea to ask about specific bolts and nuts under specific conditions. For example, certain billet conrods require 50 ft-lbs vs. the 22 ft-lbs from the A50/A65 list. Also, the years referenced in that list are meaningless with regard to our bikes. Many folks here use 30-32 ft-lbs for 3/8" cyclinder head bolts, for which the list waits until 1969 to cite that value. Additionally, when being specific you pick up additional tidbits of advice, like using thick washers under those head bolts if you have an alloy head.

Richard L.
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Offline mistergee

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Re: torque settings?
« Reply #8 on: 20.06. 2017 14:30 »
thanks all for the replies. humour and helpful advice!
The A7 flew through the MoT so I thought i'd fix the slight oil leak from the back of the clutch...that mostly went ok but as I started, I thought i'd need to take the left hand exhaust off to get clear access. all went back together great apart from struggling with the brake pedal and that big spring and then I overtightened the finned exhaust clamp and snapped it. Ordered a pair online so fingers crossed.

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Re: torque settings?
« Reply #9 on: 20.06. 2017 19:41 »
Those finned rings are fragile

Offline ellis

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Re: torque settings?
« Reply #10 on: 20.06. 2017 20:19 »
They are more for show than holding anything on. I think everyone has cracked at least one and learned from the experience, me included.   *red*

ELLIS

Offline bikerboy

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Re: torque settings?
« Reply #11 on: 20.06. 2017 20:20 »
I assume you are talking about the exhaust rose up near the head if so why on earth did you undo it?

Offline mistergee

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Re: torque settings?
« Reply #12 on: 20.06. 2017 23:35 »
can't give a sensible answer i'm afraid. I realised after loosening it, it wasn't holding the pipe in.

Offline bikerboy

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Re: torque settings?
« Reply #13 on: 21.06. 2017 00:12 »
Fair enough  *smile*

Offline Tomcat

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Re: torque settings?
« Reply #14 on: 21.06. 2017 09:01 »
I assume you are talking about the exhaust rose up near the head if so why on earth did you undo it?


Some people call them cooling rings!!! *smile*
'48 A7 '59 SR '74 850 Commando TDM900