The ventilation hose, No. 2 ventilation hose and ventilation valve sub-assembly are used for blow-by gas ventilation control. Blow-by gas with a large quantity of hydrocarbons is prevented from being discharged into the atmosphere by directing the blow-by gas into the intake system and combusting the gas. A new reflux flow system has been adopted to intake fresh air from the air cleaner hose assembly via the cylinder head cover sub-assembly and to direct blow-by gas to the intake air surge tank assembly via the cylinder head cover sub-assembly.
During light engine loads, blow-by gas is suctioned through the ventilation valve sub-assembly into the intake manifold and will be combusted. Fresh air is pulled into the crank case via the cylinder head cover sub-assembly in order to balance the crank case pressure.
During high engine loads, blow-by gas is forced through the ventilation valve sub-assembly and No. 2 ventilation hose into the intake manifold and will be combusted.
Blow-by gas is channeled through the cylinder block sub-assembly, cylinder head sub-assembly and cylinder head LH and excellent oil separation and a reduction in oil loss via the blow-by gas is achieved.
|*1||Ventilation Valve Sub-assembly||*2||Ventilation Hose|
|*3||No. 2 Ventilation Hose||-||-|
Figure 1. PCV Passage Diagram
|*1||Air Cleaner Hose Assembly||*2||Intake Air Surge Tank Assembly|
|*3||Ventilation Hose||*4||No. 2 Ventilation Hose|
|*5||Cylinder Block Sub-assembly||*6||Oil Pan Sub-assembly|
|*7||Ventilation Valve Sub-assembly||-||-|
|*a||Bank 1||*b||Bank 2|
|*c||Fresh Air (Low Engine Loads)||*d||Fresh Air|
|*e||Blow-by Gas||*f||Blow-by Gas (High Engine Loads)|