Full Member
Join Date: Apr 2019
Location: Northern NJ
Posts: 419
Bikes: 1987 Pinarello Montello, 1996 Litespeed Classic, 1996 Colnago Master Light, 1997 Litespeed Ultimate, 2006 Opera Leonardo FP, 2006 Pinarello Paris FP, 1984 Pinarello Record, 89-ish Cornelo Profilo
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40 N-m is around 29.5 ft-lbs.
You should not keep a torque wrench permanently set at torque. After use you need to release it and leave it loose.
If you heard a snap, and the cassette became loose (define how it became loose), you almost certainly broke something. Did the ring come off the hub body? Are you sure it isn't cracked? Threads deformed? Is the freehub body damaged - thread deformed or body cracked?