SOHC.co.uk Forums > CB350/400
Head + Rocker cover torques...
Laverda Dave:
Tell me more Bryan about the 'spring balance' check. My SP torque wrenches are 3/8“ and 1/2“. The 3/8 range starts at 5lb but when I've set it to 8lb for a 6mm thread it stripped.
We had a torque wrench calibration station at work and I used to walk past it thinking I would bring my wrenches in from home to test them before I retired, of course I kept forgetting and now I've retired!
Bryanj:
Clamp the square drive in the vice having set the torque wrench to any arbitrary setting, measure 1 foot from centre of square drive and affix a loop of strong twine or wire, attach one end of spring balance to loop and pull the other. Balance should read set number of lbs in lbs ft when wrench clicks. If it aint 1 foot long do 9 inches and spring shold be 9/12 of set reading when clicks.
OR if you are passing Gloucester call in and i will check it with my Snap On Torque Meter.
Remember most torque wrenches are only calibrated + or - 10%.
ka-ja:
don't forget to "break" it a few times before testing, they can seize after prolonged storage
Laverda Dave:
Thanks Bryan, I may take you up on the offer in May when we go to stay in a barn in Crasswell in Herefordshire 😊.
Thanks also Ka-ja.
I do always make a point of unwinding the wrenches after use to leave them on a zero setting as told in my school days leaving them 'set' weakens the spring and results in false readings. I don't know if true but I've always done it.
Lobo:
Laverda... I’m away from my CB400 manual right now, but am pretty sure the max torque quoted for the 6mm bolts was 6 ftlbs. If you applied 8 then I guess the threads would strip?
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