How To Judge The Quality of A Second-hand Rotary Drilling Rig Engine? The Three-step Method of Listening, Observing And Measuring

The engine is the "heart" of a second-hand rotary drilling rig, and its operating conditions directly determine the power performance and usage cost of the equipment. Mastering the three-step method of "listening, observing and measuring" can help you quickly determine the true condition of the engine.

1. Listen to the startup sound. Normal start-up should be smooth without any jamming. If accompanied by metal friction sounds, it might be due to bearing wear. Delayed startup and persistent abnormal noise suggest a malfunction in the startup system.

2. Listen to the idle sound. The stable idle speed should have a uniform sound. A sudden rise or fall is mostly due to an abnormality in the fuel supply system. If there is a "knocking" sound, it might be a problem with the piston or the valve.

3. Observe the color of the smoke exhaust. When operating normally, if the exhaust is light gray and black smoke is emitted, it may indicate incomplete combustion of the fuel. If blue smoke persists, it indicates oil burning, and one should be alert to the wear of the piston rings.

4. Check for oil stains. If there are fresh oil stains at the joints of the engine block, it may indicate seal failure. The oil pan is dented and leaking oil, or it has experienced a violent collision.

5. Measure the power output. The power attenuation is obvious under load, which may be due to a fault in the turbocharger. Slow response during sudden acceleration indicates an abnormality in the fuel injection system.

6. Test the condition of the engine oil. The oil on the dipstick is blackish-brown with particles, indicating that it has not been maintained for a long time. The emulsification and whitening of the oil may be due to the coolant seeping into the cylinder block.

In conclusion, to determine the quality of a second-hand rotary drilling rig engine, it is necessary to combine "listening, observing and testing", and conduct a comprehensive verification from sound, appearance to performance. Only by accurately identifying potential hazards can we avoid purchasing equipment with insufficient power or high maintenance costs.