Step 3 » GENERAL learning environment Category C (C, C1)

GENERAL Learning Environment Category C (C, C1)
Question 205 of 533

In the intake and exhaust manifolds, the backfires occur as a result of:

A over-revving the engine;
B overheating the engine;
C the clearance being too small between the rocker arms and the valves.

Explanation

Explanation text category C / driving tests drpciv:
When the thermal clearance (between rocker arms and valves) is too small or nonexistent, the valves do not close completely and gas leaks appear, which lead to backfires (in the intake or at the exhaust). Therefore in the intake and exhaust manifolds, the backfires occur as a result of the clearance being too small between the rocker arms and the valves.
Correct answer: C
 
Driving tests drpciv category C explained.

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