915 input shaft collared nut torque spec.

[Classic 911]

The collared nut for the input shaft has two different torque ranges.
Up til 1981 it is 160 - 180Nm.
1982 and 1983 is uncertian but 1984 , -85 and -86 is 230Nm.
The input shaft is the same from 1976 until 1986, and so are all the parts that goes on to the shaft.

So, any ideas as to why this is ?


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