Views: 1 Author: Site Editor Publish Time: 2025-03-16 Origin: Site
Accurately diagnosing the operating status of a diesel engine and detecting potential faults in time is crucial. Typically, the operating condition of a diesel engine is monitored through various instrument readings, such as cylinder explosion pressure, compression pressure, lubrication pressure, and exhaust temperature. However, in many cases, intuition and experience—through visual, auditory, tactile, and olfactory senses—can also effectively identify abnormalities.
During engine operation, experienced technicians can identify faults through sound:
If a metallic knocking sound appears after startup and weakens as the engine warms up, it may indicate excessive piston clearance.
A clear rhythmic knocking sound in the cylinder suggests early fuel injection timing, while a dull knocking sound suggests late fuel injection timing.
Unusual noises often indicate excessive mechanical clearance or loose components.
Tactile inspections can help assess engine conditions:
Touching the high-pressure fuel pipe: If one pipe shows abnormal pulsation or excessive heat, it may indicate a clogged injector or excessive cylinder load.
If no pulsation is felt, it could mean insufficient fuel supply or severe injector leakage.
Normal exhaust smoke should be light gray.
Black smoke indicates incomplete fuel combustion due to poor atomization or insufficient air intake.
Blue smoke means lubricating oil has entered the combustion chamber.
White smoke may indicate incomplete fuel combustion or water leakage into the cylinder.
Diesel smell in the lubricating oil suggests fuel leakage into the crankcase.
A burning smell may indicate overheating lubrication oil or worn-out components.
Poor compression (e.g., worn piston rings, poor valve sealing).
Fuel system issues (e.g., air in the fuel line, damaged injector pump).
Cold weather affecting fuel fluidity.
Adjust valve clearance, replace piston rings.
Remove air from the fuel line, check the injector.
Preheat the fuel to improve fluidity.
Empty fuel tank or clogged fuel filter.
Stuck injector nozzle or blocked spray hole.
Insufficient lubrication causing bearing seizure.
Check the fuel system, clean the filter.
Disassemble and clean or replace the injector.
Inspect the lubrication system, replace bearings if needed.
By integrating various sensory methods with instrument readings, accurate fault diagnosis can be achieved. Regular maintenance and inspections can significantly reduce unexpected failures, ensuring efficient and prolonged diesel engine operation.
