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 fuel tank inlet and return pipes do not meet design requirements for inner diameter and pressure