2003 FORD MUSTANG Workshop Manual

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Page 1609 of 4378

FORD MUSTANG 2003 Workshop Manual �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 inj

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.
z The inner rotor is piloted on the crankshaft post and is driven through flats on the crankshaft. Klj . 2 ba
152003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Page 1610 of 4378

FORD MUSTANG 2003 Workshop Manual �z
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.
�z Oil pump displacement has been selected to pro

Page 1611 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 9D476 EGR valve gasket
2 9D460 EGR valve
3 9D477 EGR valve-to-
exhaust manifold tube 4 W701625 Bolt (2 reqd) Klj . 4 ba
152003 Mustang Workshop M

Page 1612 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 N806154 Bolt (4 reqd)
2 N705654 Bolt
3 9F670 Idle air control valve gasket
4 9F715 Idle air control valve
5 N806154 Bolt (2 reqd)
6 N806154 Bolt (5

Page 1613 of 4378

FORD MUSTANG 2003 Workshop Manual 9 9D476 EGR valve gasket
10 9J459 EGR vacuum regulator solenoid
11 W701557 Bolt (2 reqd)
12 9F792 Fuel injection supply manifold
13 N811449 Stud (4 reqd)
14 9E498 Vacuum harness
15

Page 1614 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 6083 Cylinder head gasket
2 — Bolt (2 reqd)
3 — Washer (2 reqd)
4 6255 Spacer
5 — Secondary timing chain (2 reqd)
6 — Screw and washer
7 6C2

Page 1615 of 4378

FORD MUSTANG 2003 Workshop Manual 9 — Bolt (24 reqd)
10 6A271 Camshaft
11 6529 Roller follower (8 reqd)
12 6C501 Hydraulic lash adjuster
13 6065 Bolt (20 reqd)
14 6A273 Camshaft
15 6B278 Camshaft bearing cap (2

Page 1616 of 4378

FORD MUSTANG 2003 Workshop Manual Item Part Number Description
1 N808102 Bolt
2 N808102 Bolt
3 19A216 Belt idler pulley
4 N806155 Bolt
5 6B288 Camshaft position sensor
6 N606543 Bolt (4 reqd)
7 6L266 Timing cha

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