What Causes a Diesel Engine to Lose Compression?
1 Answers
Compressor damage is caused by liquid slugging, oil shortage, and insufficient lubrication. Compressor damage can result from the following situations: Winding short circuit, open circuit, and winding grounding to the housing: These faults are all caused by the motor part of the compressor. In the case of an open circuit, the power supply is normal, but the compressor does not work. In the case of a short circuit or grounding, the protector trips or the fuse blows after power is applied. If there is a slight inter-turn short circuit in the winding, the compressor may still work, but the temperature of the compressor will be very high, the working current will be large, and the thermal protector will trip soon after. A multimeter can be used to check for winding open circuits and winding grounding to the housing. A slight winding short circuit is difficult to determine and should be judged based on the measured current. Compressor vibration and noise: This situation often occurs during maintenance. Generally, it does not significantly affect refrigeration performance, but users may feel it is abnormal. The main causes are contact between pipes and the housing, detachment of damping blocks, and loosening of the compressor's fixing bolts. Compressor suction and discharge valve leakage: If the compressor's suction and discharge valves are damaged, even with sufficient refrigerant, the system cannot establish high and low pressure or may struggle to meet the required high and low pressure levels, resulting in no refrigeration or poor refrigeration performance. Compressor seized shaft or stuck piston: This fault is mainly caused by oil loss or the entry of impurities. After power is applied, the compressor does not operate, and the protector trips.
