تعريف timing marks في الإنجليزية الإنجليزية القاموس.
(Otomotiv) A series of marks or notches usually located on the crankshaft pulley (also called the harmonic balance wheel). When a timing light is aimed at these marks, they appear to stand still, enabling you to see if the proper mark is lined up with a stationary pointer located nearby. The proper timing marks are part of a vehicle's specifications