Tensioners help keep engines running with perfect timing. An automobile engine demands the utmost precision from the interaction of its many moving parts. The slightest timing errors between valves and pistons can spell disaster, leaving the driver stranded with a destroyed or unresponsive engine. The parts that keep an engine running in perfect synchronization include the timing belt and the timing belt tensioner.
The Timing Belt
Valves and pistons must work together with perfect timing for a car engine to do its job properly. The timing belt ensures that the camshaft spins at precisely half the speed of the crankshaft, allowing the camshaft to operate the intake and exhaust valves in perfect synchronization with the motion of the car’s pistons, according to Family Car Parts.