Your car’s timing belt might not be something you think about often, but it plays a vital role in keeping your engine running smoothly. It synchronizes the rotation of the crankshaft and camshaft, ensuring the engine’s valves open and close at the right time. If the timing belt fails, it can cause serious engine damage. Knowing the signs of a worn or failing timing belt can help you avoid a breakdown—and a big repair bill.
Ticking or Clicking Sounds from the Engine
One of the earliest signs of timing belt trouble is a ticking noise coming from under the hood. This sound is caused by the timing belt wearing out and failing to properly control the engine’s internal components. If caught early, this issue can be resolved before more serious damage occurs.
Engine Misfires or Runs Rough
A worn or stretched timing belt can affect the engine’s timing, leading to misfires. If the belt slips, the engine’s valves may open and close at incorrect intervals, disrupting the combustion process. This can result in poor performance, rough idling, and even stalling.
Visible Wear and Cracks on the Belt
If you’re able to inspect the timing belt (or if your mechanic does during routine service), look for signs of fraying, cracks, or glazing. Any visible damage is a clear sign the belt is nearing the end of its lifespan and should be replaced soon to avoid failure.
Engine Won’t Start
If the timing belt breaks while the engine is off—or snaps as you’re driving—the engine may crank but won’t start. In many engines, especially interference types, a broken belt can also cause internal damage, such as bent valves or damaged pistons, requiring extensive repairs.
Oil Leaking Near the Timing Cover
Oil leaking from the front of the engine where the timing belt cover is located could be a sign of a failing timing belt or worn seals. Oil can cause the belt to deteriorate faster, increasing the chance of failure.
Final Thoughts
Timing belt replacement is a scheduled service, often recommended between 60,000 and 100,000 miles depending on your vehicle. Don’t wait for symptoms to appear—if your car is due based on mileage, get it inspected. Replacing a worn timing belt on time is far cheaper than repairing the engine damage a snapped belt can cause.