Timing belt, pwedeng exposed or hidden. Usually hidden, lalo na kung timing chain. In either case, eto lang tatandaan, ang timing belt or chain ang nagpapaikot ng cams, na sya naman nagbubukas/sara ng intake and exhaust valves. Simply, kailangan synchronized ito sa crank, hence the word "timing".
Drive belt naman ang nagpapaikot ng power steering, alternator, water pump at A/C. At di tulad ng timing chain, hindi ito kailangan naka sync sa crank.





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