No information generic answer bolts loose shims missing worn from age debris starter getting weak worm damaged flywheel damaged
A higher mileage engine with well worn crank main bearings can allow the crank to shift enough fore and aft to cause the chipping .
Not shimmed properly
This is the ring gear on the flywheel that is damaged - they can eventually wear out - however more than likely a faulty starter motor Bendix drive gear or incorrect starting can cause this damage.
You will need to remove the gearbox to replace the ring gear.
There ring gear needs to be heated to expand it for it to be replaced.
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