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A timing belt is a mechanical contrivance which transfers motion from the crankshaft of a reciprocating internal-combustion engine to the camshaft and occasionally to some of the engine-driven accessories. It supplanted timing chains or gears as it is cheaper to manufacture, quieter in operation and requires no lubrication. It has the substantial disadvantage that it requires replacement at intervals. As the crankshaft and camshaft must remain in-phase, if the timing belt slips by one tooth, the engine ceases to function and in a few models causes costly damage to the valves and/or pistons. Replacement of the timing belt varies in difficulty from Moderate (Ford Ranger) to Extreme (Porsche 928). Generally it is not beyond the capability of the shade-tree mechanic in vehicles with longitudinally-mounted 4-cylinder engines but most FWD, V-6 and V-8 engines equipped with timing belts should be entrusted to a qualified mechanic. In no case should the timing belt be neglected, lest ye be stranded. jHh

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19y ago

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