正时皮带是一种内部发动机组件，可以同步旋转发动机的凸轮和曲轴，并在适当的时间确保每个气缸射击。这timing belt位于正时盖下，位于发动机的前部。它通常由高质量的橡胶制成，内部有尼龙增强的绳索，以延长皮带的寿命。但是，它在您的电机内部受到了令人难以置信的力量，最终需要更换。没有正常运行的正时皮带，您的发动机将无法运行。
Not all engines have a timing belt. The timing belt is commonly found in cars and SUVs with smaller移位engines. When an engine has a larger bore and stroke, most automotive manufacturers utilize atiming chainsystem that replaces the rubber belt with a metal chain. Generally, timing chains last longer than timing belts, with some rated to last the lifetime of the car. Most automotive manufacturers have a predetermined recommendation on when you should replace the timing belt, but there are a few warning indicators that a problem exists.
下面列出的是一些常见症状，可能表明您的正时皮带正在磨损或破裂 - 这将需要当地的ASE认证机械师才能更换正时皮带and inspect other internal engine components for damage.
1.发动机发出的噪音
正时皮带通过一系列滑轮连接到发动机的曲柄和凸轮轴上。曲轴为发动机的连杆杆提供动力，该连杆连接到燃烧室内的活塞。凸轮轴操作气缸盖和摇臂组件，将燃料发送到燃烧室中，并将燃烧气体排出排气歧管。当正时皮带开始磨损时，它可能会产生电动机内部的滴答声。该警告信号也可能表明油压低或发动机没有适当的润滑量。
Since the timing belt is so critical to the operation of your vehicle, if you notice this warning sign, you should contact a mechanic as soon as possible.
2. Engine won't turn over
如果正时皮带在里面断裂，engine will not be able to turn overor ignite. When you turn the key, you might hear the starter motor engage, but since the timing belt operates the crank and camshaft, it will not turn over. Obviously, if thecar won't start, a phone call to a mechanic is usually the first step. However, if the issue is due to the timing belt being broken, it may also result in other internal engine compartment damage. In many cases, the timing belt will break while the engine is running. Some of the typicaldamage done to a vehicle with a broken timing beltincludes damage to cylinder head hardware (rocker arms, push rods or valves), damage to crank bearings or oil pump inside the oil pan.
A professional and experienced mechanic will know how to inspect all of these supporting components if the正时皮带需要更换。
3. Engine misfires
A worn out timing belt might also impact the engine's fire rate. The timing belt is attached to pulleys that drive the crank and camshaft as we've indicated above. However, sometimes the belt will slip on the camshaft drive and cause one cylinder to open or close earlier than it should. This might cause amisfire situationand if not replaced soon, may result in catastrophic engine damage.
4.从电动机前面泄漏的机油
发动机也很典型泄漏机油from the timing belt cover. The cover is secured by a series of nuts and bolts that may come loose over a period of time. Another issue that will cause oil to leak is when thegasket在发动机块和正时盖之间磨损，破裂或已安装不当并被捏住。从正时皮带上泄漏油通常也导致发动机过热，并且可能过早佩戴时正式皮带。
Often, it's difficult to discover a problem with the timing belt until it's too late and has broken. However, you should check with your vehicle’s manufacturer to determinewhen the replacement interval is scheduledand have the timing belt replaced by a professional mechanic.
