2003 FORD MUSTANG Workshop Manual

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Page 1385 of 4378

FORD MUSTANG 2003 Workshop Manual DESCRIPTION AND OPERATION
Engine
WARNING: Do not operate the engine with the hood open until the fan blade has been first
examined for possible cracks and separation.
The 4.6L (4V) (281 CID) Cobr

DESCRIPTION AND OPERATION
Engine
WARNING: Do not operate the engine with the hood open until the fan blade has been first
examined for possible cracks and separation.
The 4.6L (4V) (281 CID) Cobra engine is a V- 8 with the following features:
z intercooled supercharger
z dual overhead camshafts
z four valves per cylinder
z sequential multiport fuel injection (SFI)
z an aluminum intake manifold
z aluminum cylinder heads
z a cast aluminum, 90-degree V- cylinder block
z individually chain- driven camshafts with a hydraulic timing chain tensioner on each timing chain
z the electronic ignition system with eight ignition coils
Identification
Always refer to these labels when replacement parts are necessary or when checking engine
calibrations. The engine parts often differ within a CID family. Verification of the identification codes will
ensure that the correct parts are obtained. These codes contain all the pertinent information relating to
the dates, optional equipment and revisions. The Ford Master Parts Catalog contains a complete
listing of the codes and their application.
Code Information
The engine code information label, located on the side of the valve cover and the front side of the
valve cover, contains the following:
zengine build date
z engine plant code
z engine code
Exhaust Emission Control System
Operation and necessary maintenance of the exhaust emission control devices used on this engine is
covered in the Powertrain Control/Emissions Diagnosis (PC/ED) manual.
Induction System
The sequential multiport fuel injection (SFI) provides the fuel/air mixture needed for combustion in the
cylinders. The eight solenoid- operated fuel injectors:
z are mounted in the lower intake manifold.
z meter fuel into the air intake stream in accordance with engine demand.
SECTION 303-
01C: Engine — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Klj . 1 ba
162003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

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FORD MUSTANG 2003 Workshop Manual �z
are positioned so that their tips direct fuel just ahead of the engine intake valves.
�z are connected in series with the fuel pressure sensor.
�z supply fuel from the fuel tank with a fuel pump

z
are positioned so that their tips direct fuel just ahead of the engine intake valves.
z are connected in series with the fuel pressure sensor.
z supply fuel from the fuel tank with a fuel pump mounted in the fuel tank.
A constant fuel pressure drop is maintained across the fuel injectors by the fuel pressure sensor. The
fuel pressure sensor:
zis positioned upstream from the fuel injectors on the fuel injection supply manifold.
Valve Train
The valve train operates as follows:
zball- tip hydraulic lash adjusters provide automatic lash adjustment.
z roller followers ride on the camshaft lobes, transferring the up-and- down motion of the
camshafts to the valves in the cylinder heads.
Positive Crankcase Ventilation System
All engines are equipped with a closed- type positive crankcase ventilation system recycling the
crankcase vapors to the upper intake manifold.
Lubrication System
The engine lubrication system operates as follows:
zoil is drawn into the oil pump through the oil pump screen cover and tube in the sump of the oil
pan.
z oil is pumped through the oil bypass filter on the left front side of the cylinder block.
z oil enters the main oil gallery where it is distributed to the crankshaft main journals and to both
cylinder heads.
z From the main journals, the oil is routed through cross- drilled passages in the crankshaft to
lubricate the connecting rod bearings. Controlled leakage through the crankshaft main bearings
and connecting rod bearings is slung radially outward to cool and lubricate the cylinder walls as
well as the entire connecting rod, piston and piston rings assembly.
z The left cylinder head is fed from a drilling into the supply passage feeding the main gallery at
the front of the cylinder block. The right cylinder head is fed from a drilling into the rear of the
main gallery. Main gallery pressure is reduced as it enters the cylinder head galleries through
fixed serviceable orifices located at the upper part of the feed passages. It is this reduced
pressure in the cylinder head galleries which feeds the camshaft journals, the hydraulic lash
adjusters and the primary and secondary timing chain tensioners.
z The camshaft lobe and roller followers are lubricated by splash created through valve train
operation.
Oil Pump
The lubrication system of the 4.6L (4V) engine 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 using top seal rotors. Generically this design is known as a gerotor
pump, which operates as follows.
zThe oil pump is mounted on the front face of the cylinder block. Klj . 2 ba
162003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Page 1387 of 4378

FORD MUSTANG 2003 Workshop Manual �z
The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft.
�z System pressure is limited by an integral, internally- vented relief valve which directs the
by

Page 1388 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 6F066 Supercharger assembly
2 N806154 Screws (2 reqd)
3 9F715 Idle air control valve
4 — Idle air control valve gasket
5 9P697 Spacer assembly
6 9E9

Page 1389 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 12B637 Wiring harness
2 9C986 Fuel pulse damper
3 9F792 Fuel injection supply manifold
4 9F593 Fuel injector
5 — Stud
6 9D475 Exhaust gas recirculat

Page 1390 of 4378

FORD MUSTANG 2003 Workshop Manual 9 — EGR vacuum hoses
10 6F089 Vacuum actuator valve
11 N605892 Bolts (2 reqd)
12 — Bolts (10 reqd)
13 9J447 Lower intake manifold
14 9L438 Coolant intake manifold gasket
15 —

Page 1391 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 N605904 Bolt
2 N620480 Nut
3 6A946 Cover
4 17K814 Alternator bracket assembly
5 N811268 Bolts (2 reqd)
6 8620 Accessory drive belt
7 N606543 Bolt

Page 1392 of 4378

FORD MUSTANG 2003 Workshop Manual 9 6268 Timing chain (2 reqd)
10 6M256 Timing chain guide
11 6L266 Timing chain tensioner
12 6L253 Timing chain tensioner arm
13 6268 Timing chain (2 reqd)
14 N804958 Bolt (2 reqd)

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