Timing

[Tony Press]

For those placing timing marks on the Austin camshaft pulley, the diameter of the outside of the flange is 4.25 inches, so the circumference is 13.35 inches which represents 720 crank degrees.  This gives a distance of 0.0185 inch (0.47 mm) per crank degree.

So 10 crank degrees is 0.185 inch (4.7 mm), 20 degrees is 0.37 inch (9.4 mm) and 28 degrees is 0.52 inch (13.2 mm)

And don't forget as mentioned the fan pulley is not keyed so can be all over thevplace if taken off