When cylinder head area "dangdang" tapping (touch piston valve), "there is a" friction touch valve (piston) or other abnormal sound, engine working instability, often is the precursor of valve fell cylinder, then parked immediately, otherwise it will be destroyed piston, cylinder head and cylinder liner, or even top curved rod, break the body, snap the crankshaft.
Dao an early sign of cylinder: dao cylinder is a destructive larger mechanical failure, in addition to the valve fall caused dao cylinder cylinder, is mostly caused by connecting rod bolt loose back.Connecting rod bolt loose back or after stretching, connecting rod bearing fit clearance increases, then the crankcase parts can hear "clicking" tapping, tapping change from small to big, the connecting rod bolt completely fall off or broken, connecting rod and bearing cap out, break the body and related parts.
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