Case Study on Difficulties in Starting a Diesel Engine
Case Study on Difficulties in Starting a Diesel Engine
Reasons and troubleshooting methods for the difficulty of starting a diesel engine
① The diesel engine does not run for a long time: the oil return pipe must extend below the diesel liquid level
② there is a small amount of air in the low-pressure pipeline: exhaust
③ the crankshaft speed signal and camshaft signal are too weak, and the synchronous judgment time is longer Long: readjusted
④ The ambient temperature is too low, and the preheating device is invalid: Replace the preheating device
⑤ The quality of diesel and oil is too poor to meet the standards: Replace the standard oil
⑥ Starter or flywheel ring gear teething: Replace the starter and flywheel teeth Ring
⑦ Piston ring, cylinder liner is worn or valve is not tight: Replace piston ring, cylinder liner or valve seat, valve
⑧ Exhaust brake butterfly valve stuck in closed position, resulting in poor exhaust: Replace butterfly valve Slow
⑨ rail pressure buildup caused by excessive fuel volume: Replace injector assembly
⑩ fuel tank inlet and return pipes do not meet design requirements for inner diameter and pressure
Example 1: Difficult start of a diesel engine
Symptom description:
-The start-up time is too long, and the rail pressure establishment process is too slow. Check the oil circuit and find that the oil pipe of the low-pressure oil circuit is too thin. All low-pressure oil pipes are started smoothly after being replaced and deflated.
Example 2: Difficult start of a diesel engine
Symptom description:
-The car has difficulty starting before leaving the factory. After parking for a while, starting is difficult. The starting effect is good after pumping oil with the hand pressure pump, but after the flame is turned off, after a period of time, it cannot be started at once.
-Suspected a low pressure oil circuit.
-Remove the oil inlet pipe and find that there is a paper strip at the nozzle to block it. Consider that the oil inlet may be poor due to this reason. After opening the fuel tank, it was found that there was no filter under the oil inlet pipe, so that impurities entered the oil pipe.
-Clean the fuel tank and filter, check the oil return pipe, find that there are air bubbles in the oil return pipe, tighten the connections of the oil return pipe, exhaust, and the engine returns to normal.
Tip: The oil return pipe should be inserted below the fuel level, and the oil return pipe should be higher than the oil inlet pipe.
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Reference: Journal of Construction Machinery and Maintenance
