2003 FORD MUSTANG timing belt

noise—
normally
accompanied by
vibration Powertrain/Drivetrain Mount Neutralizing in this
section.
z Damaged or
misaligned exhaust
system. z
INSPECT the exhaust
system for loose or broken
clamps and brackets.
CARRY OUT Exhaust System Neutralizing in this
section.
z Whistling noise—
normally
accompanied
with poor idle
condition z
Air intake system. zCHECK the air intake
ducts, air cleaner, throttle
body and vacuum hoses for
leaks and correct fit.
REPAIR or ADJUST as
necessary. REFER to
Section 303 - 12
z
Clunking noise zWater pump has
excessive end play or
imbalance. z
CHECK the water pump for
excessive end play.
INSPECT the water pump
with the drive belt off for
imbalance. INSTALL a new
water pump as necessary.
REFER to Section 303 -
03A .
z Generator has
excessive end play. z
CHECK the generator for
excessive end play.
REPAIR or INSTALL a new
generator. REFER to
Section 414 - 02 .
z Pinging noise zExhaust system leak. zINSPECT the exhaust
system for leaks. REPAIR
as necessary.
z Gasoline octane too
low. z
VERIFY with customer the
type of gasoline used.
CORRECT as necessary.
z Knock sensor
operation. z
CHECK the knock sensor.
INSTALL a new knock
sensor as necessary.
REFER to Section 303 - 14 .
z Incorrect spark
timing. z
CHECK the spark timing.
REPAIR as necessary.
z High operating
temperature. z
INSPECT cooling system
for leaks. CHECK the
coolant level. REFILL as
necessary. CHECK the
coolant for the correct mix
ratio. DRAIN and REFILL
as needed. CHECK engine
operating temperature is
within specifications.
REPAIR as necessary.
z Foul- out spark plug. zCHECK the spark plugs.
REPAIR or INSTALL new
spark plugs as necessary.
z Catalytic converter. zAcceptable noise.
z Knocking noise—
light knocking
noise, also z
Excessive clearance
between the piston
and the cylinder wall. z
Engine cold and at high
idle. Using an EngineEAR,
pull a spark plug or fuel Klj . 24 ba
702003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

(PC/ED) manual.
z Damaged valve
tappet or lash
adjuster. z
INSTALL a new valve tappet or
lash adjuster.
z Damaged valve
tappet guide or
valve tappet. z
INSTALL a new valve tappet
guide or valve tappet.
z Burnt or sticking
valve. z
REPAIR or INSTALL a new
valve.
z Weak or broken
valve spring. z
INSTALL a new valve spring.
z Carbon
accumulation in
combustion
chamber. z
ELIMINATE carbon buildup.
z Excessive oil
consumption z
Leaking oil. zREPAIR oil leakage.
z Malfunctioning PCV
system. z
REPAIR or INSTALL new
necessary components.
z Worn valve stem
seal. z
INSTALL a new valve stem seal.
z Worn valve stem or
valve guide. z
INSTALL a new valve and valve
guide.
z Sticking piston
rings. z
REPAIR or INSTALL new piston
rings.
z Worn piston ring
groove. z
INSTALL a new piston and
piston pin.
z Worn piston or
cylinder. z
REPAIR or INSTALL a new
piston or cylinder block.
z Engine noise zLeaking exhaust
system. z
REPAIR exhaust leakage.
z Incorrect drive belt
tension. z
REFER to Section 303 - 05 .
z Malfunctioning
generator bearing. z
Refer to the appropriate section
in Group 414 for the procedure.
z Malfunctioning
water pump
bearing. z
REFER to Section 303 - 03A .
z Malfunctioning or
damaged cooling
system. z
REFER to Section 303 - 03A .
z Malfunctioning or
damaged fuel
system. z
Refer to the appropriate section
in Group 303 for the procedure.
REFER to the Powertrain
Control/Emissions Diagnosis
(PC/ED) manual.
z Loose timing
chain/belt (6268). z
ADJUST or INSTALL a new
timing chain/belt.
z Damaged timing
chain tensioner
(6L266). z
INSTALL a new timing chain
tensioner.
z Excessive main
bearing clearance. z
ADJUST clearance or INSTALL
a new crankshaft main bearing
(6333). Klj . 4 ba
172003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

GENERAL PROCEDURES
Sprockets
1. 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 been examined for
possible cracks and separation.
NOTE: Specifications show the expected minimum or maximum condition. Refer to the
appropriate section in Group 303 for the procedure.
NOTE: If a component fails to meet the specifications, it is necessary to install a new
component or refinish. If the component can be refinished, wear limits are provided as an aid to
making a decision. A new component must be installed for any component that fails to meet
specifications and cannot be refinished.
Inspect the timing chain/belt and the sprockets.
zInstall new components as necessary. Refer to the appropriate section in Group 303 for
the procedure.
SECTION 303-
00: Engine System — General Information 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

IN-
VEHICLE REPAIR
Timing Chain
Removal 1. Remove the timing cover. For additional information, refer to Engine Front Cover in this section.
2. Remove the camshaft position sensor drive gear. 1. Remove the bolt.
2. Remove the camshaft position sensor drive gear.
3. Rotate the crankshaft (6303) until the timing marks and keyways align.
4. Compress and install a retaining pin to hold the timing chain tensioner (6L266).
5. Remove the camshaft sprocket (6256), the crankshaft sprocket (6306) and the timing chain/belt (6268) as an assembly.
SECTION 303-
01A: Engine — 3.8L 2003 Mustang Workshop Manual Klj . 1 ba
52003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

N806155 Bolt (2 req'd)
92 6C315 Crankshaft position sensor
93 N806300 Stud bolt (5 req'd)
94 6C086 Engine front cover
95 N806155 Bolt
96 6B288 Camshaft position sensor
97 N606543 Bolt (4 req'd)
98 6L266 Timing chain tensioner
99 6268 Timing chain belt
100 6K297 Timing chain cover
101 6M269 Timing chain tensioner
102 6L253 Timing chain tensioner arm
103 N806184 Bolt (3 req'd)
104 19D629 A/C compressor
105 8501 Water pump
106 N806177 Bolt (4 req'd)
107 N806183 Bolt (4 req'd)
108 6621 Oil pump
109 N806201 Woodruff key
110 6333 Crankshaft main bearing (5 req'd)
111 6A341 Crankshaft thrust washer (3 req'd)
112 6C357 Crankshaft main bearing side bolt (10 req'd)
113 6010 Cylinder block
114 9439 Intake manifold gasket (2 req'd)
115 6083 Head gasket
116 6505 Exhaust valve (8 req'd)
117 6507 Intake valve (8 req'd)
118 87838 Pipe plug (8 req'd)
119 12405 Spark plug (8 req'd)
120 6F087 Dowel
121 9431 Exhaust manifold
122 6C501 Valve tappet (16 req'd)
123 6529 Rocker arm (16 req'd)
124 6049 Cylinder head, RH
125 W701681 Stud (8 req'd)
126 9Y431 Exhaust manifold gasket
127 9F485 EGR valve tube to manifold connector
128 W701706 Nut (8 req'd)
129 181198A Engine lifting eye
130 6A517 Valve stem seal (16 req'd)
131 6513 Valve spring (16 req'd)
132 Klj . 6 ba
92003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

6514 Valve spring retainer (16 req'd)
133 6518 Valve spring retainer key (32 req'd)
134 6065 Cylinder head bolt (20 req'd)
135 6C255 Camshaft
136 9J434 EGR transducer
137 N807309 Bolt (2 req'd)
138 N806139 Bolt
139 8620 Drive belt
140 N806165 Washer
141 6316 Crankshaft pulley
142 8A528 Water pump pulley
143 6700 Crankshaft front seal
144 N808793 Stud bolt (2 req'd)
145 N806177 Bolt (6 req'd)
146 N806176 Bolt (3 req'd)
147 3A674 Power steering pump
148 12A227 Ignition pulse ring
149 6306 Crankshaft sprocket (2 req'd)
150 6268 Timing chain/belt
151 6K297 Timing chain guide
152 N804958 Bolt (4 req'd)
153 6A338 Crankshaft main bearing (4 req'd)
154 6A346 Crankshaft main bearing cap dowel pin (10 req'd)
155 6345 Crankshaft main bearing cap bolt (9 req'd)
156 N806155 Bolt (2 req'd)
157 W701240 Bolt (16 req'd)
158 6675 Oil pan
159 6710 Oil pan gasket
160 N605904 Bolt
161 6622 Oil pump screen cover and tube
162 N806180 Spacer
163 6K258 Crankshaft main bearing cap stud
164 6325 Main bearing cap (5 req'd)
165 6A339 Crankshaft thrust main bearing
166 N602549 Bolt
167 6303 Crankshaft
168 7563 Clutch pressure plate
169 7550 Clutch disc
170 N808139 Bolt (6 req'd)
171 6375 Flywheel (manual transmission)
172 N811363 Bolt (2 req'd)
173 Klj . 7 ba
92003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

a
Refer to the procedure. Oil pan-to-
engine front cover bolts a — — —
Oil pump-
to-cylinder block bolt 10 — 89
Radio ignition interference capacitor bolts 25 18 —
Oil pump screen and pickup tube-
to-main bearing cap stud spacer bolt 25 18 —
Water pump pulley bolts 25 18 —
Throttle body spacer nuts 25 18 —
Vacuum accessory bracket fasteners 10 — 89
Valve cover bolt 10 — 89
Wiring harness support bracket 25 18 —
Water pump-
to-cylinder block bolt 25 18 —
EGR valve to exhaust manifold tube nuts 40 30 —
Power steering pump to engine 25 18 —
Power steering hose bracket nut 25 18 —
Power steering reservoir bracket fasteners 10 — 89
Supercharger degas bottle bolts 10 — 89
Camshaft cap cluster to cylinder head 10 — 89
Timing chain tensioner bolts—
primary 25 18 —
Timing chain tensioner bolts—
secondary 10 — 89
Ignition coil cover bolts 10 — 89
Generator mounting bracket retainers 10 — 89
Oil level indicator tube retainer 10 — 89
Primary timing chain guide-
to-engine bolts 10 — 89
Oil pump screen and pickup tube spacer to main bearing stud 25 18 —
Belt idler pulley bolt 25 18 —
Subframe brace nuts 41 30 — Klj . 5 ba
62003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Item Part Number Description
1 N605904 Bolt
2 N620480 Nut
3 6A946 Cover
4 17K814 Alternator bracket assembly
5 N811268 Bolts (2 req'd)
6 8620 Accessory drive belt
7 N606543 Bolt (4 req'd)
8 6L266 Timing chain tensioner Klj . 7 ba
162003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...