(They are also less durable than timing chains.) The timing belt runs through a series of pulleys that have belt tensioners in place and usually wear out at the same time as the belt. Timing BeltsĪ timing belt is, like the name implies, a belt much like the other “serpentine” belts on your car’s engine. Made of rubber and high-tensile fibers, they are quieter, lighter, less expensive and much easier to replace than timing chains. Please give Coho Auto a call if you’re not sure which engine type you have. On a non-interference engine, the belt/chain could break and not cause extensive internal damage because the pistons and valves are never in the same place at the same time. You don’t need to be a mechanic to know that if this happens, the outcome will not be pretty. In other words, the valves and pistons should never meet. While they can share the same space, even multiple times in a second, they can NEVER be there at the same time. If the timing belt/chain breaks, the valves and pistons could end up in the cylinder at the same time. An interference engine is one in which the valves and pistons occupy the same space in the cylinder – but not at the same time. No discussion of timing belts/chains would be complete without a few words about interference engines. The engine won’t work properly, if at all, if the timing is off. Timing belts control the movement of the crankshaft and camshaft(s), also known as “mechanical timing,” which opens the valves at a precise time in conjunction with the pistons. Throughout this cycle, the camshaft spins once and the crankshaft rotates twice. The four-stroke combustion process has an intake stroke, a compression stroke, a power stroke, and an exhaust stroke. The Basics of Engine Timing Belts and Timing Chains The best way to approach this subject is to begin by explaining why engine timing is so important in a four-stroke internal combustion engine.
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