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Old 25th October 2013 | 10:45
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phiggsbroadband
 
Joined: Aug 2012
Posts: 532
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From: Wales
Have you noticed that Open-Ended or Ring Spanners are all of different lengths; Short ones for small nuts and long ones for big nuts. It helps limit the torque applied 'by feel'.

I remember one engine I owned had cylinder bolts that were very long and slim, the idea was that they acted as a spring in tension, so any thermal expansion did not cause a change of force exerted. They needed torqueing-up to a set figure, then backing off slightly to remove the twist.
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