Where does oil separation occur in this PCV system?

The diagram shows the oil separation area located in the cylinder head cover.

Where does fresh air enter the ventilation system?

Fresh air comes from the air cleaner into the throttle body area and flows through Ventilation Hose 2 toward the engine, as shown by the open arrows.

Where does the blow-by gas go?

Blow-by gas (solid arrows) is routed from the crankcase up through the oil separation area in the cylinder head cover, through Ventilation Hose 1 via the surge tank RH, and to the intake manifold.

What ports are labeled on the throttle body in this diagram?

Port A, Port B, and Port C are labeled at the throttle body, with an additional Port B labeled near the surge tank RH.

What engine internal components are labeled in the cutaway?

Cylinder head cover, cylinder head, piston, connecting rod, cylinder block, and oil pan.

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V6 Engine PCV / Blow-By Gas Flow Schematic - Crankcase Ventilation Diagram

Engine cutaway with crankcase ventilation hose routing through throttle body ports

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Schematic showing crankcase ventilation blow-by gas routing through the throttle body ports and ventilation hoses.

AI caption August 2007 · Photo 894 of 1028

This document is a schematic diagram of a positive crankcase ventilation (PCV) / blow-by gas flow system for a V6 engine. The left portion shows a cutaway of the engine with labeled components: cylinder head cover, oil separation area, cylinder head, piston, connecting rod, cylinder block, and oil pan. The right portion shows the ventilation circuit at the throttle body and surge tank (RH side), with labeled Ports A, B, and C, airflow arriving from the air cleaner, flow directed to the intake manifold, and two labeled hoses (Ventilation Hose 1 and Ventilation Hose 2). Directional arrows distinguish fresh air flow (open arrows) from blow-by gas flow (solid arrows), showing fresh air entering the crankcase circuit and blow-by gases being routed via the oil separator and ventilation hoses back into the intake system. A reader can learn the routing path of crankcase gases, which ports on the throttle body/surge tank the ventilation hoses connect to, and where oil separation occurs in the cylinder head cover. The diagram contains no part numbers, torque specifications, model designations, or year information — it is purely a flow/routing schematic.

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Frequently asked questions

Where does oil separation occur in this PCV system?: The diagram shows the oil separation area located in the cylinder head cover.
Where does fresh air enter the ventilation system?: Fresh air comes from the air cleaner into the throttle body area and flows through Ventilation Hose 2 toward the engine, as shown by the open arrows.
Where does the blow-by gas go?: Blow-by gas (solid arrows) is routed from the crankcase up through the oil separation area in the cylinder head cover, through Ventilation Hose 1 via the surge tank RH, and to the intake manifold.
What ports are labeled on the throttle body in this diagram?: Port A, Port B, and Port C are labeled at the throttle body, with an additional Port B labeled near the surge tank RH.
What engine internal components are labeled in the cutaway?: Cylinder head cover, cylinder head, piston, connecting rod, cylinder block, and oil pan.