2003 FORD MUSTANG valve lash adjuster

5. Remove the timing chain (6268) and the camshaft sprocket (6256).
6.
NOTE: LH tensioner is shown, RH tensioner is similar.
Remove the tensioner.
7. Remove the roller followers on the base circle. 1. Install the special tool on the valve spring.
2. Compress the tool and remove the roller follower.
8. Repeat the previous step for the remaining roller followers.
9. Remove the hydraulic lash adjusters. Klj . 3 ba
112003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

7. Install the hydraulic lash adjusters.
8. Install the roller followers.
1. Install the special tool on the valve spring.
2. Compress the spring and install the roller follower.
9. Repeat the previous step for the remaining roller followers.
10. NOTE: LH tensioner is shown, RH tensioner is similar. Klj . 8 ba
112003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Valve Head Diameter
·
Intake 37 mm (1.46 inch)
·
Exhaust 30 mm (1.18 inch)
·
Gauge Diameters 35.0 and 28.0 mm (1.378-
1.102 inch) Valve Face Runout Limit 0.05 mm (0.002 inch)
Valve Face Angle 45.5 degrees
Valve Stem Diameter (Std)
·
Intake 6.975-
6.995 mm (0.2754- 0.2746 inch) ·
Exhaust 6.949-
6.970 mm (0.2744- 0.2736 inch) Valve Springs
·
Compression Pressure (N (Lb) @ Spec
Length) ·
Intake 711.47 N @ 26.19 mm (159.9 Lb-
Ft @ 1.031
inch) ·
Exhaust 711.47 N @ 26.19 mm (159.9 Lb-
Ft @ 1.031
inch) ·
Free Length (Approximate) ·
Intake 42.16 mm (1.6598 inch)
·
Exhaust 42.16 mm (1.6598 inch)
·
Installed Pressure (N (Lb- Ft) @ Spec. Length) ·
Intake 289.1 N @ 36.14 mm (64.99 Lb-
Ft @ 1.4228
inch) ·
Exhaust 289.1 N @ 36.14 mm (64.99 Lb-
Ft @ 1.4228
inch) ·
Service Limit 10% Pressure Loss @ 28.02 mm (1.103 inch)
Roller Follower
·
Ratio 1.8:1
Hydraulic Lash Adjuster
·
Diameter (Std) 16.000-
15.988 mm (0.6299- 0.6294 inch) ·
Clearance to Bore 0.018-
0.069 mm (0.000709- 0.002717 inch) ·
Service Limit 0.016 mm (1.0006299 inch)
·
Hydraulic Leakdown Rate d 5-
25 seconds ·
Collapsed Lash Adjuster Gap— Desired 0.80-
1.20 mm (0.0315- 0.0472 inch) CAMSHAFT
Theoretical Valve Lift @ Zero Lash
·
Intake (Primary) 10.0 mm (0.3937 inch)
·
Intake (Secondary) 10.0 mm (0.3937 inch)
·
Exhaust 10.0 mm (0.3937 inch)
End Play 0.025-
0.165 mm (0.00098- 0.00649 inch) ·
Service Limit 0.190 mm (0.007480 inch)
Journal to Bearing Clearance 0.025-
0.076 mm (0.00098- 0.002992 inch) ·
Service Limit 0.100 mm (0.003937 inch) MAX
Journal Diameter (All) 26.962-
26.936 mm (1.0615- 1.0605 inch) Klj . 2 ba
62003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

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~ ...

9 — Bolt (24 req'd)
10 6A271 Camshaft
11 6529 Roller follower (8 req'd)
12 6C501 Hydraulic lash adjuster
13 6065 Bolt (20 req'd)
14 6A273 Camshaft
15 6B278 Camshaft bearing cap (2 req'd)
16 9448 Exhaust manifold gasket
17 9F485 EGR valve tube to manifold connector
18 W701706 Nut (8 req'd)
19 9431 Exhaust manifold
20 6C324 PCV tube
21 6A505 Valve cover
22 W708442 Stud bolt (4 req'd)
23 N808199 Bolt (16 req'd)
24 6766 Oil filler cap
25 12A366 Ignition coils
26 6P068 Ignition coil cover
27 N807309 Bolt (4 req'd)
28 6050 Cylinder head Klj . 8 ba
152003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

6.
NOTE: LH tensioner is shown, RH tensioner is similar.
Remove the tensioner.
7. Remove the roller followers on the base circle. 1. Install the special tool on the valve spring.
2. Compress the tool and remove the roller follower.
8. Repeat the previous step for the remaining roller followers.
9. Remove the hydraulic lash adjusters. Klj . 3 ba
112003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

7. Install the hydraulic lash adjusters.
8. Install the roller followers.
1. Install the special tool on the valve spring.
2. Compress the spring and install the roller follower.
9. Repeat the previous step for the remaining roller followers.
10. NOTE: LH tensioner is shown, RH tensioner is similar. Klj . 8 ba
112003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...