A timing belt, or cambelt, keeps the rotations of the crankshaft and the camshaft in sync. In turn, this coevality ensures engine valves operate in synchrony with piston movements. Because it coordinates the workings of multiple parts, failing to replace a timing belt in good time can result in damage to numerous components and a hefty repair bill. It pays – literally – to keep an eye out for potential timing belt issues. Here are some signs that your timing belt needs replacing.
Constant Engine Misfires
If your timing belt has a problem, engine misfires will often be the first indicator of trouble. A malfunctioning belt throws the synchronization of various engine subsystems out of whack. This mis-synchronization causes the engine to run rough. In most cases, the ‘check engine’ light on your dashboard will turn on as the engine control unit (ECU) of your car detects a problem with fuel delivery to the cylinders.
Unusual Noises Coming from the Engine
One of the most distinctive warning signs of a faulty timing belt is a ticking or tapping sound from the top of the engine. This sound is made by valves and tappets working with less-than-ideal lubrication because of low oil pressure in the upper levels of the engine. In certain instances, your dashboard low oil pressure warning light will turn on.
Hear rubbing noises coming from your engine when your car is idling? This is another common sign of timing belt trouble. The cause is a worn or loose timing belt rubbing against its plastic cover. Without quick redress, the belt eventually weakens and snaps.
Rough Idling and Loss of Power
Rough idling and loss of power are other common warning signs of timing belt malfunction. A slipped or loose belt will often cause the idling to sound harsh, uneven, or unusual in some way. Another common consequence is loss of engine power, which leads to a sluggish throttle response. In some cases, the engine may cut out altogether.
Closing Thoughts
Engine misfires, loss of power, rough idling, and unusual engine noises are not the only signs that your timing belt needs replacement. Some other signs are white or blue exhaust smoke, an unusually large amount of smoke, and oil leaks from the front of the motor. If the belt has completely snapped, your engine will not start at all.
The best way of avoiding timing belt problems is to have it replaced at manufacturer-recommended intervals. While the typical duration between replacements is 50,000 miles to 60,000 miles, many modern cars come with belts rated to run for at least 150,000 miles. You may need to have your belt replaced earlier if you tend to drive your car hard or live in a harsh environment – or if you note any of the aforementioned issues.
