BSA Owners' Club Forum

The BSA Workshop => Twins => Topic started by: MALCOLM.JOHNSON on 11 November, 2017, 14:15:12

Title: Torque settings again.
Post by: MALCOLM.JOHNSON on 11 November, 2017, 14:15:12
I have recently rebuilt the 1952 A7 engine and tightened the big end caps on the alloy connecting rods using data from the BSA SERVICE SHEET No.208. My rods use the later 26 t.p.i. bolts and the  recommended torque setting for those in the service sheet is 8.5 lbs.ft. Sometime afterwards I was reading the D. W. Munro book on BSA Twins and in this he quotes 22lbs.ft. for all the models. I borrowed a very hi tech torque wrench for the job as my own was off the scale at such a low setting. I am having sleepless nights about using the lower figure - any words of comfort out there.
Title: Re: Torque settings again.
Post by: Bess on 11 November, 2017, 17:03:02
Hi,

    22 tpi BSF bolts are 10 lb/ft, 26 tpi CEI are 81/2 lb/ft. From 1956 onwards the torque setting is 22 lb/ft.

Sounds like you are okay  :) :)

Best wishes...
Title: Re: Torque settings again.
Post by: JulianS on 11 November, 2017, 18:27:59
If using the later self locking nuts just check that the full depth of nut is on threaded portion of the bolt so that the self lock is engaged.

See also attached service sheet.
Title: Re: Torque settings again.
Post by: MALCOLM.JOHNSON on 12 November, 2017, 21:40:35
Thanks to you both - I will have a celebratory drink ;D