What Does the Secondary Maintenance Include?
2 Answers
Automobile secondary maintenance aims to focus on inspection and adjustment. Here is a detailed introduction to secondary maintenance: 1. Main contents of secondary maintenance: Measure the cylinder pressure of the engine, adjust the valve clearance, clean various filters, the oil pan, the float assembly of the oil strainer, inspect and adjust the wear and clearance of the connecting rod bearings, check and tighten the front and rear engine mounting bolts, inspect and adjust the brakes, perform tire rotation, and check the clutch and adjustments of other assemblies. 2. Secondary maintenance is performed when the vehicle has traveled 6,000~8,000 km: Secondary maintenance involves a more in-depth technical condition inspection and adjustment for vehicles that have traveled a certain mileage, mainly to ensure that the vehicle maintains good operational performance for a longer period in the future. 3. Secondary maintenance involves more tasks: In addition to all the tasks of primary maintenance, secondary maintenance must also eliminate any faults and hidden dangers discovered during the maintenance process. The maintenance takes a longer time and is usually performed by maintenance workers. Before secondary maintenance, the driver should provide the maintenance workers with any poor technical conditions encountered during the vehicle's operation to improve the quality of maintenance.
I've been driving a taxi for twenty years, so I know all about secondary maintenance. I get it done every 20,000 kilometers, focusing mainly on checking the chassis and replacing filters. The mechanic will remove the tires to inspect brake pad thickness, measure brake disc wear, and check if the suspension bushings are cracked. Under the hood, the three filters must be replaced—the air filter directly affects engine power, the cabin air filter impacts breathing health, and the oil filter ensures proper lubrication. Finally, they'll scan the ECU for trouble codes and have the mechanic adjust the tire balance. The whole process takes about two hours and costs around 800 to 1,000 yuan, but it prevents breakdowns on the road.
