Nissan Juke Service and Repair Manual : Structure and operation

Positive Crankcase Ventilation

This system returns blow-by gas to the intake manifold.


This system returns blow-by gas to the intake manifold.

The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake manifold.

During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV valve.

Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.

The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes through the hose connecting air inlet tubes to rocker cover.

Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.

The flow goes through the hose connection in the reverse direction.

On vehicles with an excessively high blow-by, the valve does not meet the requirement. This is because some of the flow will go through the hose connection to the air inlet tubes under all conditions.

System


    System
    ...

    Other materials:

    Meters and gauges
    1. Tachometer 2. Engine coolant temperature gauge 3. Vehicle information display Odometer/twin trip odometer Trip computer Torque vectoring AWD (AWD model) Outside air temperature 4. Fuel gauge 5. Speedometer 6. Warning/indicator lights 7. Instrument brightness control ...

    Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
    The Supplemental Restraint System such as AIR BAG and SEAT BELT PRE-TENSIONER, used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. Information necessary to service the system safely is include ...

    Valve oil seal
    VALVE OIL SEAL : Removal and Installation REMOVAL 1. Remove camshafts. Refer to EM-78, "Exploded View". 2. Remove valve lifters. Refer to EM-78, "Exploded View". 3. Rotate crankshaft, and set piston whose valve oil seal is to be removed to TDC. This will prevent valve from ...