Sure, here's the translation of the symptoms that may occur when a timing chain fails in a truck:

 **Engine Noise**: When the timing chain is damaged, the engine's valvetrain operation becomes abnormal, causing unusual noises during operation. This noise typically becomes more pronounced as the engine RPM increases.

- **Increased Fuel Consumption**: Damage to the timing chain can lead to reduced efficiency in the intake and exhaust processes, which in turn causes incomplete fuel combustion and increased fuel consumption.

- **Increased Oil Consumption**: Damage to the timing chain can potentially cause oil leaks, leading to an increase in oil consumption.

- **Difficulty Starting**: Severe damage to the timing chain can prevent the engine from running properly, resulting in difficulty starting the vehicle.

- **Loss of Power**: Damage to the timing chain affects the engine's valvetrain, leading to a decrease in engine power and a reduction in the vehicle's overall performance.

- **Excessive Exhaust Emissions**: After the timing chain is damaged, the engine's combustion efficiency decreases, leading to an increase in harmful substances in the exhaust emissions.

These symptoms indicate that the timing chain may need inspection or replacement to avoid more serious issues with the vehicle. If any of these symptoms are present, it is recommended to have the vehicle checked and serviced promptly.