Technician A says that freewheeling engines are not in danger of valve damage due to a broken timing component. Technician B says that balance shafts do not need to be timed to the crankshaft. Who is correct?
A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct. Freewheeling engines have a mechanism that prevents the valves from hitting the pistons if the timing belt/chain breaks, so there is no danger of valve damage.

Technician B is incorrect. Balance shafts should be timed precisely to the crankshaft in order to cancel out the vibrations caused by the engine's reciprocating parts. Failure to time the balance shafts correctly can lead to excessive engine vibration and premature wear of engine parts.

Technician a Says That Freewheeling Engines Are Not in Danger