Engine

Engine

The 3.7L (4V) is a V-6 engine with the following features:

- Dual overhead camshafts

- Four valves per cylinder

- Sequential Multi-Port Fuel Injection (SFI)

- An aluminum lower intake manifold and a composite upper intake manifold

- Aluminum cylinder heads

- An aluminum, 60-degree V-cylinder block

- Timing chain driven coolant pump

- Variable Camshaft Timing (VCT) system

- The electronic ignition system with 6 ignition coils

Engine Identification

For quick identification, refer to the safety certification decal.

- The decal is located on the LH front door lock face panel.

Engine Code Information Label

The engine code information label, located on the front side of the valve cover, contains the following:










Engine Cylinder Identification





Exhaust Emission Control System

Operation and required maintenance of the exhaust emission control devices used on this engine is covered in Computers and Control Systems Information.

Induction System

The SFI (Sequential Multi-Port Fuel Injection) provides the fuel/air mixture needed for combustion in the cylinders. The 6 solenoid-operated fuel injectors:

- are mounted between the fuel rail and the intake manifold.

- meter fuel into the air intake stream in accordance with engine demand.

- are positioned so that their tips direct fuel just ahead of the engine intake valves.

Valve Train

The valve train uses Direct Acting Mechanical Buckets (DAMB). The camshaft lobes are positioned directly above mechanical buckets which are positioned on top of the valves.

Variable Camshaft Timing (VCT) System

The VCT (Variable Camshaft Timing) system changes intake camshaft timing dependent on engine speed, load and oil temperature. Oil pressure advances and retards camshaft timing to improve low-speed and high-speed engine performance, engine idle quality and exhaust emissions.

PCV System

All engines are equipped with a closed-type PCV system recycling the crankcase vapors to the upper intake manifold.

Lubrication System

The engine lubrication system is of the force-feed type in which oil is supplied under full pressure to the crankshaft, connecting rod bearings, timing chain tensioners and VCT (Variable Camshaft Timing) solenoids. The flow of oil to the valve tappets and valve train is controlled by a restricting orifice located in the cylinder head, front camshaft cap.

Oil Pump

The lubrication system is designed to provide optimum oil flow to critical components of the engine through its entire operating range.

The heart of the system is a positive displacement internal gear oil pump.

Generically, this design is known as a gerotor pump, which operates as follows:

- The oil pump is mounted on the front face of the cylinder block.

- The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft.

- System pressure is limited by an integral, internally-vented relief valve which directs the bypassed oil back to the inlet side of the oil pump.

- Oil pump displacement has been selected to provide adequate volume to make sure of correct oil pressure both at hot idle and maximum speed.

- The relief valve calibration protects the system from excessive pressure during high-viscosity conditions.

- The relief valve is designed to provide adequate connecting rod bearing lubrication under high-temperature and high-speed conditions.

Cooling System

NOTICE: Early build vehicle cooling systems are filled with Motorcraft(R) Specialty Green Engine Coolant and late build vehicle cooling systems are filled with Motorcraft(R) Specialty Orange Engine Coolant. Use the same type of coolant that was originally used to fill the cooling system. Do not mix coolant types. Mixing coolant types degrades the coolant corrosion protection and may damage the engine or cooling system.

NOTICE: Motorcraft(R) Specialty Green Engine Coolant is very sensitive to light. Do NOT allow this product to be exposed to ANY LIGHT for more than a day or two. Extended light exposure causes this product to degrade.

NOTE: During normal vehicle operation, Motorcraft(R) Specialty Orange Engine Coolant may change color from orange to pink or light red. As long as the engine coolant is clear and uncontaminated, this color change does not indicate the engine coolant has degraded nor does it require the engine coolant to be drained, the system to be flushed, or the engine coolant to be replaced.

The engine cooling system includes the following:

- Radiator

- Timing chain driven coolant pump

- Electric fan assembly(s)

- Degas bottle (aids in maintaining the correct volume of engine coolant)

- Coolant thermostat

- Coolant hoses