Preventing and Resolving Diesel Engine "Boiling" in Loader Forklifts: Maintenance and Repair Methods

Maintaining optimal operating temperatures is crucial for the smooth functioning of a loader forklift's diesel engine. However, sometimes the engine can experience a phenomenon known as "boiling," where the temperature rises excessively, causing the coolant to boil and steam in the water tank. In this article, we will explore the reasons behind this issue and provide preventive measures and repair methods to ensure the efficient performance of loader forklifts.

1. Thick Inner Wall of Heat Dissipation Pipe: One common cause of engine "boiling" is the inner wall of the radiator's heat dissipation pipe (core) being too thick, impeding proper heat dissipation. To prevent this, it is important to regularly clean the cooling water and remove scale from the water tank. Additionally, ensure that clean cooling water is regularly added to maintain the appropriate levels.

2. Radiator or Cooling System Leaks: Leakage in the radiator or cooling system can result in insufficient coolant, leading to engine overheating. Detecting the source of water leakage is crucial, and once identified, the issue should be resolved promptly. After addressing the leakage, it is essential to add enough cooling water to the system to ensure proper cooling.

3. Damaged Cylinder Head Gasket or Cylinder Liner: If the cylinder head gasket or cylinder liner is damaged, high-pressure gas from the cylinder can enter the water cooling system, causing the water tank to foam and boil. This condition is often accompanied by the emulsification of the diesel engine oil. It is important to check for any damage to the cylinder head gasket or cylinder liner and replace them if necessary.

4. Damaged Water Pump: A damaged water pump can hinder the circulation of cooling water or reduce its circulation intensity. It is crucial to investigate the cause of water pump damage and, if required, replace it with a new one to ensure proper cooling system functionality.

5. High Load Operation and Loose Fan Belt: Working under high loads for extended periods can cause the fan belt to become loose, resulting in inadequate wind speed for cooling. Proper workload management is necessary to prevent the loader from overheating. Regularly inspect and adjust the tension of the fan belt to maintain optimal cooling performance.

6. Faulty Thermostat: A malfunctioning thermostat can prevent the opening of the large cycle, leading to engine overheating. If the thermostat is damaged, it should be promptly replaced to restore proper cooling operation.

Special Consideration for Alpine Regions: Loaders operating in alpine regions are prone to "boiling" due to radiator freezing, which restricts coolant circulation. To prevent this issue, it is recommended to add a heat preservation device to the front end of the radiator when using a loader in alpine conditions.

Conclusion: To ensure the efficient and safe operation of loader forklifts, it is vital to address and prevent the "boiling" of diesel engines. By understanding the causes behind this phenomenon and implementing proper maintenance and repair methods, such as regular cleaning, leak detection, and component replacement when necessary, loader forklift owners can minimize the risk of engine overheating and ensure the longevity of their equipment.