Exhaust anomaly is a comprehensive reflection of internal engine faults. Therefore, whether the exhaust gas is normal or not is one of the important signs of judging the working condition of the engine. Timely processing can ensure the normal operation of the diesel engine and avoid unnecessary economic losses. The fuel did not have time to fully burn, and even did not reach the peak of combustion. The engine went to the next stroke, and the mixture was still being exhausted. The reasons for this phenomenon and the elimination methods were as follows: (1) The injection advance angle was too small. It is the whole advance angle, replacement of wear parts. (2) Misalignment of the valve timing or just the wrong gear installation. The corrective measures are promptly corrected. (3) Some nozzles are clogged, and the oil valve occasionally wears severely. The treatment is to replace worn parts. (4) The exhaust valve does not close tightly, the valve spring is too weak, the spring is broken, or the valve clearance is too small. The solution is to grind or replace the valve and adjust the valve clearance. (5) The injector needle valve is badly sealed and there is a phenomenon of oil dripping. The treatment method is to replace the needle valve. (6) Partial valve push rods are bent and stuck. The treatment is to replace worn parts.
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