Question

technician a says that a freewheeling engine has enough clearance between the pistons and the valves so that they can never make contact. technician b says that an interference engine has pistons that will hit each other if the timing belt breaks. who is correct? select one: a. technician a b. technician b c. both a and b d. neither a nor b

Explanation:

• Technician A: A freewheeling engine (non - interference engine) is designed such that there is sufficient clearance between the pistons and valves. So, under normal operating conditions (even if the timing belt breaks), the pistons and valves will not come into contact. Technician A's statement is correct.
• Technician B: An interference engine has a design where if the timing belt breaks (or there is a timing failure), the pistons and valves (not pistons and pistons) will come into contact. Technician B's statement is incorrect as it wrongly mentions piston - to - piston contact instead of piston - to - valve contact for an interference engine.

Answer:

a. Technician A