2003 FORD MUSTANG timing

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
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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
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9 6268 Timing chain (2 req'd)
10 6M256 Timing chain guide
11 6L266 Timing chain tensioner
12 6L253 Timing chain tensioner arm
13 6268 Timing chain (2 req'd)
14 N804958 Bolt (2 req'd)
15 6B274 Timing chain guide
16 N606527 Bolt
17 19D269 A/C compressor
18 N806184 Bolts (3 req'd)
19 6306 Crankshaft sprocket
20 6L253 Timing chain tensioner arm
21 12A227 Ignition pulse ring
22 6C086 Engine front cover
23 N806177 Bolts (8 req'd)
24 N806300 Studs (5 req'd)
25 6700 Crankshaft front seal
26 6316 Crankshaft pulley
27 N806165 Washer
28 W701512 Stud
29 8A528 Water pump pulley
30 N806282 Bolts (4 req'd)
31 N806177 Bolts (4 req'd)
32 8501 Water pump
33 N808102 Bolt
34 19A216 Belt idler pulley
35 N804178 Nut
36 N806300 Harness support bracket
37 N806300 Stud
38 N806155 Bolt
39 6C315 Crankshaft position sensor
40 N806155 Bolt
41 6B288 Camshaft position sensor
42 N808920 Bolts (3 req'd)
43 6C254 Crankshaft extension support pulley
44 10153 Lower support bracket
45 N605909 Bolts (2 req'd)
46 8620 Accessory drive belt
47 N811268 Bolt
48 8B603 Belt idler bracket support
49 N808198 Stud
50 Klj . 8 ba
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9N491 Hose and tube assembly
Item Part Number Description
1 6083 Cylinder head gasket
2 — Bolt (2 req'd)
3 — Washer (2 req'd)
4 6255 Spacer
5 — Secondary timing chain (2 req'd)
6 — Screw and washer
7 6C271 Timing chain vibration damper Klj . 9 ba
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IN-
VEHICLE REPAIR
Timing Drive Components
Removal CAUTION: Since the engine is not free- wheeling, if the crankshaft (6303) or the camshafts
(6250) are moved in any manner during removal and installation, the crankshaft and the
camshafts must be resynchronized.
1. Remove the engine front cover (6019). For additional information, refer to Engine Front Cover in
this section.
2. Remove the crankshaft sensor ring from the crankshaft.
3. CAUTION: Unless otherwise instructed, at no time when the timing chains (6268)
are removed and the cylinder heads (6049) are installed is the crankshaft (6303) or the
camshaft (6250) to be rotated. Severe piston (6108) and valve damage will occur.
Using the special tool, position the crankshaft as shown.
SECTION 303-
01C: Engine — Cobra 4.6L (4V) 2003 Mustang Workshop Manual Special Tool(s)
Holding Tool, Crankshaft
303-
448 (T93P-6303- A) Klj . 1 ba
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4.
CAUTION: The camshaft timing marks must be correctly lined up or damage to the
valves and pistons can occur.
NOTE: The copper links on the timing chain may not line up with the timing marks on the
sprockets.
Make sure the timing marks on the camshaft sprockets are correctly positioned. If necessary,
turn the crankshaft one full turn clockwise to correctly position the sprockets.
5. NOTE: LH shown; RH similar.
Remove the two bolts, the timing chain tensioner (6L266) and tensioner arm (6L253).
6. CAUTION: Unless otherwise instructed, at no time when the timing chains are
removed and the cylinder heads are installed is the crankshaft or the camshaft to be
rotated. Severe piston and valve damage will occur.
Remove the LH and RH timing chains and the crankshaft sprocket (6306).
zRemove the special tool from the crankshaft.
z Remove the RH timing chain from camshaft sprocket.
z Remove the RH timing chain from the crankshaft sprocket.
z Remove the LH timing chain from the camshaft sprocket.
z Remove the LH timing chain and crankshaft sprocket. Klj . 2 ba
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7.
CAUTION: The bolts are different lengths and must be returned to their original
location.
NOTE: RH shown; LH similar.
Remove the bolts and the timing chain guides (6K297).
Installation 1. CAUTION: Timing chain procedures must be followed exactly or damage to the
pistons or valves will result.
Compress the tensioner plunger, using a soft- jawed vise.
2. Install a retaining clip on the tensioner to hold the plunger in during installation. zRemove the tensioner from the vise. Klj . 3 ba
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3. If the copper links are not visible, mark one link on one end and one link on the other end, and
use as timing marks.
4. Install the timing chain guides.
5. Rotate the LH camshaft sprocket until the timing mark is approximately at the 12 o' clock position. Rotate the RH camshaft timing sprocket until the timing mark is approximately in the
11 o' clock position.
6. CAUTION: Unless otherwise instructed, at no time when the timing chains are Klj . 4 ba
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