Engine: Description and Operation

This engine incorporates a closed-type Positive Crankcase Ventilation (PCV) system and exhaust emission control system. All engine/emission control system diagnosis and testing is covered in Powertrain Management/Testing and Inspection.

To maintain the required exhaust emission levels, the fuel system, ignition system, and engine must be kept in good operating condition and meet recommended adjustment specifications.

When performing tests, adjustments, or service to the engine, ignition system, or fuel system, it is essential to follow the procedures and specifications. Also see Powertrain Management/Testing and Inspection.

WARNING: DO NOT STAND CLOSE TO ROTATING COMPONENTS WHILE THE ENGINE IS OPERATING.

Before replacing original parts, check damaged or worn components such as the:
- crankshaft.
- cylinder heads.
- valve guides.
- exhaust valves.
- intake valves.
- camshafts.
- cylinder blocks.

Ensure that the original part(s) do not meet specifications and cannot be serviced to meet specifications. Refer to the service procedures to determine if a component is within specification or if it is serviceable to remain in service.

WARNING: TO AVOID THE POSSIBILITY OF PERSONAL INJURY OR DAMAGE TO THE VEHICLE, DO NOT OPERATE THE ENGINE WITH THE HOOD OPEN UNTIL THE FAN BLADE HAS FIRST BEEN EXAMINED FOR POSSIBLE CRACKS AND SEPARATION.






The 3.0L (180.6 CID) OHC V6 engine is a free-wheeling engine with an in-head camshaft design with 12 valves, one intake valve and one exhaust valve per cylinder. Hydraulic valve tappets are used to provide maintenance-free valve clearance. The combustion chamber is designed with crossflow intake and exhaust ports and a pent-roof combustion chamber and squish area For increased combustion. The one-piece crankshaft main bearing cap provides for increased rigidity and reduced vibration.