Positive Crankcase Ventilation System Overview

WARNING: This page is about a different variant/trim than selected.

GM4918166

Courtesy of GENERAL MOTORS COMPANY

NOTE: Callouts items in the following chart represent components shown in graphic above.

Positive Crankcase Ventilation System Overview

Callout	Component Name
Preliminary Procedure The tamper-proof positive crankcase ventilation system includes components that may be replaced if necessary. The system may include an outlet duct connected to the end of the Positive Crankcase Ventilation Tube. If any component is suspect, refer to the inspection procedures and individual replacement procedures before attempting to disassemble the PCV system. Be careful when moving the assembled components with tamper-proof fittings to avoid stress on the connections.
1	Camshaft Cover NOTE: In the event that the camshaft cover requires replacing, the PCV hose at the air outlet duct and turbocharger will be removed by cutting and/or prying at the connection. The air outlet duct and turbocharger must remain intact in order to reinstall these components. Procedure Thoroughly clean the camshaft cover and mating surfaces. Inspect each component, O-rings, and fasteners, and replace as necessary. Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant Refer to Camshaft Cover Replacement if the camshaft cover does not pass inspection.
2	Positive Crankcase Ventilation Tube NOTE: All PCV valves are tamper-proof and cannot be serviced. Procedure Inspect the PCV connection fittings and tubes. Replace the Positive Crankcase Ventilation Tube if suspect. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .
3	Turbocharger NOTE: The PCV fitting is tamper-proof and cannot be serviced. A new PCV tube and valve are included with a new turbocharger assembly. NOTE: On earlier designs of this system the fastener at the PCV fitting on the turbocharger was not tamper-proof. To aid in disassembly or removal, this fastener can be removed if it is not tamper-proof. Procedure Completely inspect the turbocharger and all other engine components that may cause similar conditions before replacing the turbocharger. Refer to Symptoms - Engine Mechanical .
4	Positive Crankcase Ventilation Tube NOTE: All PCV valves and fittings are tamper-proof and cannot be serviced. Procedure Inspect the PCV connection fittings and tubes. Replace the Positive Crankcase Ventilation Tube if suspect. Refer to Positive Crankcase Ventilation Hose/Pipe/Tube Replacement .
5	Air Cleaner Outlet Duct - Model Dependent NOTE: The air cleaner outlet duct is equipped with a tamper proof connection that should NOT be removed unless the PCV tube or air cleaner outlet duct is being replaced. Loosening the air cleaner outlet duct clamps will allow the duct to be disconnected from the air cleaner assembly and turbocharger for repositioning without removing the tamper proof connection. Procedure Inspect the duct and hose, or the connection if the duct is not attached to the hose. Replace any components that are suspect. Refer to Air Cleaner Outlet Duct Replacement (Non-Tamperproof) , or Air Cleaner Outlet Duct Replacement (Tamperproof) .