Diesel generator valve falling into the cylinder is usually caused by valve rod fracture, valve spring fracture, valve spring seat cracking, air door lock clamp falling off and other reasons. When the cylinder head part of the jingle (piston against the valve), click friction (piston against the valve) or other abnormal sound, the engine is not stable, often is the precursor of the valve cylinder. The flameout should be stopped immediately, otherwise it will bend the piston, cylinder head, cylinder liner and even connecting rod, damage the body and break the crankshaft. Tamping cylinder is a destructive mechanical failure. In addition to the valve falling off caused by the pull cylinder, mainly caused by the loosening of connecting rod bolts. Assembly clearance of connecting rod bearing after loosening or stretching connecting rod bolt. At this point, a clicking sound can be heard in the crankcase. The faucet has grown from small to large. Connecting rod bolts fall off or break, connecting rod and bearing cover are thrown out, body and related parts break.

When the crankshaft journal shoulder of diesel generating set has hidden crack due to fatigue, the fault symptom is not obvious. With the crack expansion and aggravation, the engine crankcase issued a dull knocking sound, the change of speed when the knocking sound aggravation, the engine smoke. Soon, the knock gets louder, the engine shakes, the crankshaft breaks, and fires. Therefore, diesel generator crankcase abnormal sound, should immediately stop for inspection. When the flywheel has hidden cracks, it will make a hoarse sound when struck with a hammer. When the engine is working, the flywheel makes a tapping sound. When the RPM changes, the sound will increase and the engine will tremble. If the machine is not stopped for inspection at this time, it is easy to cause a sudden break of the flywheel, debris flying out of the injury accident.