In the fields of construction machinery and mining operations, diesel rotary screw air compressor machines are highly favored for their powerful performance and high efficiency. However, as the ambient temperature rises in summer or when the equipment operates continuously for a long time, "diesel engine overheating" has become a common problem encountered by many on-site operators. As a professional manufacturer of diesel screw air compressors, we suggest that users establish a systematic troubleshooting approach and start from the following aspects to quickly identify the root cause of the problem.
Ⅰ. The cooling system is the primary object to be inspected.
About half of the overheating problems of diesel engines are caused by abnormal cooling systems.
Fan belt: If the belt is loose, slipping or damaged, it will cause insufficient air volume for heat dissipation. At this time, the tension of the belt needs to be adjusted or a new belt should be replaced directly.
Fan pulley: Improper installation position can cause the belt to deviate or reduce the effective contact area. The pulley installation should be recalibrated.
Radiator fins: At the construction site, there is a lot of dust, and the fins are prone to being clogged by cotton fibers and soil, which affects the heat exchange efficiency. They should be cleaned regularly from the inside out with compressed air or a low-pressure water gun.
Water tank pressure cap: A malfunctioning pressure cap can cause the boiling point of the coolant to drop and lead to premature overflow. It is necessary to check its sealing and pressure relief functions. If it fails, it should be replaced immediately.
Ⅱ. Second, the levels of coolant and engine oil must not be ignored.
Low coolant level is a common human factor. It should be replenished to the specified mark in time. Remember to open the pressure cap only after the machine has stopped and cooled down to avoid scalding.
If the oil level in the oil pan is too low, it will not only accelerate the wear of moving parts but also cause the diesel engine to heat up due to poor lubrication. It is necessary to add oil to the normal level.
III. Fuel System and Thermostat Faults
Excessive fuel supply or incorrect fuel injection timing: The combustion of the mixture will be delayed or incomplete, causing the exhaust temperature to rise and be transferred to the engine block. It is necessary to have a professional check the fuel injection pump and the fuel injection advance angle.
Thermostat issues: Failure to install the thermostat, incorrect installation, or the thermostat being stuck in the closed position will prevent the coolant from performing large circulation. Please install or replace the thermostat correctly according to the original factory specifications.
IV. Matching of Pumps and Loads
If the water pump does not work, the impeller corrosion or drive damage will cause the coolant to fail to circulate. The water pump must be disassembled for inspection or replaced.
Excessive load: If the air compressor operates continuously at a pressure higher than the rated pressure for a long time, the diesel engine will be overloaded and overheat for a long time. Check the setting values of the pressure switch and the unloading valve, and adjust them to the specified range if necessary.
As an original equipment manufacturer, we recommend that users regularly maintain the cooling and lubrication systems and use genuine parts. If the overheating problem persists after the above checks, please contact our after-sales team for professional support. Protecting the health of your equipment starts with scientific troubleshooting.
