When should the original timing belt be replaced?
2 Answers
The original timing belt should be replaced when the vehicle reaches 80,000 kilometers. The functions of the timing belt are: 1. To drive the engine's valve train, ensuring the intake and exhaust valves open and close at the correct times; 2. To guarantee the engine cylinders can properly intake and exhaust air. The replacement procedure for the timing belt is: 1. Remove the valve cover and the timing belt housing; 2. Rotate the crankshaft to position the first cylinder at top dead center, then secure the crankshaft with the fixing bolt; 3. Rotate the intake and exhaust camshafts—there are grooves at the rear of the camshafts—align the grooves of both camshafts horizontally; 4. Remove the old belt and install the new one; 5. Ensure there is no gap at the crankshaft position sensor during installation to avoid triggering fault codes.
I've changed the timing belt on my own car several times. Generally, it needs replacement every 60,000 to 100,000 kilometers. The exact interval depends on the vehicle model and manual—some brands like Toyota and Honda may recommend around 80,000 km, while German cars might require it sooner. My old car once snapped its belt at 70,000 km without prior replacement, causing complete engine failure and a repair bill over 10,000 yuan—totally not worth it. Older cars should get earlier replacements, while newer models may have more durable materials. Don’t overlook environmental factors: driving in dusty rural areas or hot climates accelerates wear. Ideally, have a mechanic inspect it every 40,000 km for cracks or slack—safety first. I make it a habit to check during routine maintenance to avoid sudden breakdowns, which cost far more than a belt replacement.
