No. Insurance does not cover mechanical problems.
Only if it was caused by a collision or sabotage.
Possible internal engine damage.
Auto insurance covers damage caused during an accident. If the engine is damaged during an accident that's covered. If it's damaged for any other reason then that isn't covered.
No. But if you have proof positive that the mechanic caused the damage, HIS insurance will cover the repairs. Call your local office of the State Attorney General.
perhaps failing oil pump caused engine damage
engine implodes
Blown head gaskets.
Oh yes!
Engine, not motor, and that depends on your insurance policy. If you don't have flood insurance specifically, flood damage is typically not covered.
the engine is flooded with gas
Could be very severe engine damage if the motor is an interference engine if not could just need the belt replaced