Determining whether a truck needs an overhaul usually involves a careful examination and evaluation of multiple critical systems and components of the vehicle. Here are some key steps and considerations:

Mileage vs. Time: First, consider the mileage and age of the truck. In general, domestic cars may need to be overhauled when driving about 100,000 kilometers, while imported cars may need to be overhauled after driving more than 100,000 kilometers. But this is only a rough reference, the actual situation may vary depending on the use of the vehicle, maintenance and model differences.

Technical qualification: As the truck approaches the scheduled overhaul deadline, a technical qualification should be performed to assess its technical condition. Technical qualification usually includes a detailed examination of key components such as the engine, chassis, electrical system, brake system, suspension system, etc. If most assemblies are found to be in good technical condition, but individual assemblies are severely worn, such as engines, it may only be necessary to overhaul these heavily worn parts.

Engine performance evaluation: The engine is the heart of the truck, and its performance directly determines the operation of the truck. If the engine shows severe wear, aging, or significant decline in power performance, an overhaul may need to be considered. This includes replacing key components such as valves, pistons, cylinder liners, and may even require a complete disassembly and repair of the engine.

Observation of vehicle running status: In daily use, drivers can judge whether a major repair is needed by observing the running status of the truck. For example, pay attention to whether the vehicle is easy to start, whether the idle speed is smooth and normal, whether the engine has abnormal noise or abnormal jitter, and whether the exhaust is abnormal. These are important clues to determine whether the truck needs an overhaul.

Fault recording and analysis: Regularly recording and analyzing the fault situation of the truck is also an important method to determine whether a major repair is needed. If the truck breaks down frequently, or if the breakdown is getting worse, it may mean that the vehicle needs to be overhauled.

In general, determining whether a truck needs an overhaul is a comprehensive process that takes into account a number of factors such as the truck’s mileage, technical evaluation results, engine performance, daily operation status, and fault history. If you cannot determine for yourself, it is recommended to seek the help of professional maintenance personnel.