Mark mhl420 ,
All 6 cylinder ring gears have 108 teeth
The starter pinion has 9 teeth and it's diameter is approx 29mm
Your starter motor is possibly jamming because the ring gear is worn.
I have seen a few Lucas starters with broken nose cones due to the pinion jamming on the flywheel ring gear , especially the alloy nose cones of the later models.
Best to inspect the ring gear and if it's badly worn replace it .
GeoffD
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