23-12-2019, 08:13 PM
It is true the cones provide final centring but the dowells are near enough.
If the stud is not tight and thus stud is subject to fluctuating load, is liable to fatigue failure. The stud is likely to be tensioned to maybe 10 ton psi which amounts to a clamp of a ton on each stud, enough to ensure the stud or dowells are not subject to bending.Thick paint and dirt or grease can be a problem, encouraging movement. The drum retaining screws must be distinctly below surface level. On many "modern" cars the drums are not separately retained.
The wheel pulling over fully clamping nut is another issue.
If the stud is not tight and thus stud is subject to fluctuating load, is liable to fatigue failure. The stud is likely to be tensioned to maybe 10 ton psi which amounts to a clamp of a ton on each stud, enough to ensure the stud or dowells are not subject to bending.Thick paint and dirt or grease can be a problem, encouraging movement. The drum retaining screws must be distinctly below surface level. On many "modern" cars the drums are not separately retained.
The wheel pulling over fully clamping nut is another issue.