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tapping the valves at the timing
wall door seal failure
not using recommended engine oils
Starting problem, due to air fuel mixture leakage from intake valve seat, (Lake of compression) especially in cold weather. Also if inlet / exhaust valve not adjusted properly, that can cause a serious damage of engine ( can hit to piston top ) result, engine sized etc.
Less power
High fuel consemption
Engine valves wear failure, valve face recession, fatigue failure, thermal fatigue, errossion or corrossion of valves, carbon deposite on the valves
An exact diagnosis of the reason for a failure can never fully be assertained until disassembly and inspection of the unit, the main symptoms of a valve failure will be a lack of compression in the engine and possibly related audible indators resulting from physical damage to the valve grear train.
common engine valve failure is thermostate
Cylinder power imbalance. If leak occurs on the intake side, it causes intake flow issues with other cylinders. Burnt valves (due to escaping exhaust gases during the combustion cycle)
oil pump , air filter , oil filter. fuel filter
Bent Valves, Burnt Valves
