Right Reg,
Are you sitting comfortably? First - a warning - Mr Douglas in his wisdom refers to anything on the engine as seen looking at the timing chest - so left hand on the engine is actually right hand on the machine.
Now looking at the timing gear train - with the engine at TDC, the crankshaft pinion should have the keyway at 3 o'clock and the timing mark (in line with a tooth) at 6 o'clock. The idler has a matching mark between 2 teeth - then going clockwise, a dot in line with the 11th tooth, then going on another 15 teeth, a line in line with the tooth.
Now the 2 camshaft gears look to be identical at first glance, but the keyways are positioned differently (by ½ a tooth). The left hand gear has the keyway in line with a tooth, and starting with that tooth, the timing mark (a line) is between the 16th and 17th teeth. The right hand gear has the keyway lining up between 2 teeth - going round clockwise, the timing mark (a dot) should be between the 15th and 16th teeth.
There are no marks on the distributor gear or it's idler. A good starting point for distributor timing is 5 degrees before TDC (fully retarded)(static). Most of the Miller distributors are now suffering quite a bit of wear, and the best results are usually obtained by trial and error, and a few miles of road testing.
If this new member still has problems sorting out the timing, get him to phone me and I will try to talk him through it.
Regards,
Eddie.