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View More >>As a core component of the engine, the timing chain is responsible for accurately coordinating the operation of the crankshaft and camshaft. Once a failure occurs, it may cause serious damage to the engine. Although its life is longer than that of the timing belt, it is not "lifetime maintenance-free". The following are key indicators and maintenance cost analysis to determine when to replace it.
Abnormal noise (metal friction/clattering sound)
When the chain is stretched or the tensioner fails, it will emit a clear "metal knocking sound" during cold start or low-speed operation (especially at the front end of the engine).
Note: The noise may be similar to other components (such as hydraulic top cylinders) and requires professional diagnosis.
Engine fault light is on
Chain skipping teeth will cause the camshaft and crankshaft signals to be out of sync, triggering fault codes (such as P0016/P0017).
Power reduction or ignition difficulty
Timing misalignment causes abnormal valve opening and closing, which is manifested as weak acceleration, increased fuel consumption, and even missing cylinders.
Insufficient oil pressure warning
The tensioner of some models depends on oil pressure. Oil deterioration or leakage can cause chain slack.
High mileage or lack of maintenance
Although it claims to be "maintenance-free", the actual life is affected by the quality of the oil (usually 150,000-250,000 kilometers need to be checked).
Manual inspection: disassemble the valve cover and observe the chain slack or tensioner stroke (professional technicians are required).
Diagnostic instrument code reading: Check whether the camshaft/crankshaft position sensor data is synchronized.
Endoscope exploration: Some models can observe the chain status through the oil filling port.
Item | Cost Range (RMB) | Description |
---|---|---|
Timing Chain Kit | 800-3,000 RMB | Includes chain, tensioner, and guides (price varies by brand, e.g., INA vs OEM) |
Labor Cost | 1,000-4,000 RMB | Requires disassembly of engine front cover (4-8 hours, depending on model complexity) |
Additional Repairs | 500-2,000 RMB | If replacing oil, seals, or related damaged parts (e.g., VVT sprocket) |
Total Cost | 2,300-9,000 RMB | Higher for luxury cars or transverse-engine models |
Money-saving suggestions:
Regular replacement of high-quality oil (full synthetic) can extend the life of the chain.
If only the tensioner fails, it can be replaced separately to reduce costs.
❌ Misunderstanding: "Timing chain does not need to be replaced" → In fact, regular inspection is required (especially German turbocharged models).
⚠️ Risk warning: Delaying replacement may cause valve and piston collision, and repair costs may soar to tens of thousands of yuan!