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During a cylinder leakage test, air comes out of the PCV valve opening in the rocker arm cover. This is an indication of:

A. worn intake valves
B. worn exhaust valves
C. a broken PCV valve
D. worn piston rings

Answer :

Final answer:

Air coming out of the PCV valve opening during a cylinder leakage test indicates worn piston rings.

Explanation:

Air coming out of the PCV (Positive Crankcase Ventilation) valve opening in the rocker arm cover during a cylinder leakage test is an indication of worn piston rings. The PCV valve is designed to release excess pressure and prevent the buildup of harmful gases in the crankcase. When air escapes through the PCV valve during a leakage test, it suggests that the piston rings are not creating a proper seal, allowing air to leak into the crankcase and escape through the PCV valve.

In a cylinder leakage test, air is pressurized into the cylinder at top dead center (TDC) to check for any leaks. If air is escaping through the PCV valve opening, it means that the air is bypassing the piston rings and entering the crankcase. This indicates that the piston rings are worn or damaged, and they are unable to provide an adequate seal between the piston and cylinder wall.

Worn piston rings can result in low compression, increased oil consumption, and poor engine performance. It is important to address this issue to avoid further damage to the engine.

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