Timing Belt Replacement

Why it matters

The timing belt keeps the crankshaft and camshafts turning in step, which is what keeps valves and pistons out of each other's way. Belts are rubber and reinforced cord: they age with heat and time, not just mileage. Many engines are interference designs, meaning if the belt lets go, pistons hit valves.

Signs it is time

• Mileage is near the interval in your owner's manual
• Belt looks glazed, frayed, or cracked when inspected
• Ticking or squealing from the front of the engine
• Coolant or oil leaking onto the belt area
• The car sits unused for long stretches — rubber ages regardless of miles

If you wait

On an interference engine, a snapped timing belt can bend valves and damage pistons. The repair becomes a cylinder head job — or a replacement engine.