1986 Hiace warped flywheel - is it common?

[Druid]

Due to heat, my flywheel seems to warp, or the ring gear. My 1986 Hiace commuter won't start if the motor is driven too long, and periodically when I am driving around town. Just wondering if it is a common problem in 3Y motors in 1986 Hiace.

[Hiro]

How do you know it's the flywheel/ring-gear and not just an issue with the starter motor?

[Druid]

Cause I have just changed a new starter motor.

[Hiro]

13 hours ago, Druid said:

Cause I have just changed a new starter motor.

It could be something else in the starting circuit too (relay, battery, wires etc).  Unless you can prove that the flywheel is warped without removing the gearbox I'd be checking everything else first (otherwise you could be spending an arm and a leg on labour for something that could be completely fine)