timing FORD MUSTANG 2003 Service Manual

4. Remove the special tools from both ends of the cylinder head.
NOTE: Lubricate the hydraulic lash adjusters with clean engine oil.
5. Install the hydraulic lash adjusters in their original locations.
6. CAUTION: Timing chain procedures must be followed exactly or damage to the
valves and pistons will result.
NOTE: LH shown, RH similar. Klj . 4 ba
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Compress each tensioner plunger, using a vise.
7. Install a retaining clip on each tensioner to hold the plunger in during installation.
8. Remove the tensioner from the vise.
9. 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.
10. Install the timing chain guides. 1. Position LH timing chain guide.
2. Install and tighten the bolts.
3. Position the RH timing chain guide.
4. Install and tighten the RH bolts. Klj . 5 ba
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11. Rotate the RH camshaft sprocket until the timing mark is approximately at the 11 o'clock
position. Rotate the LH camshaft sprocket until the timing mark is approximately at the 12
o'clock position.
12. CAUTION: When instructed to do so, rotate the crankshaft counterclockwise only.
Do not rotate past the position shown or severe piston and valve damage can occur.
NOTE: The number one cylinder is at top dead center (TDC) when the stud on the engine block
fits into the slot in the handle of the special tool.
Using the special tool, position the crankshaft so the number one cylinder is at TDC. Klj . 6 ba
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13. Remove the special tool.
14. Install the crankshaft sprocket, making sure the flange faces forward.
15. Position the LH (inner) timing chain on the crankshaft sprocket, aligning the copper (marked)
link with the timing mark on the sprocket.
16. Install the LH timing chain on the camshaft sprocket, aligning the copper (marked) link with the timing marks on the sprocket. Klj . 7 ba
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17.
NOTE: The LH timing chain tensioner arm has a bump near the dowel hole for identification.
Position the LH timing chain tensioner arm on the dowel pin and install the LH timing chain
tensioner.
18. Remove the retaining clip from the LH timing chain tensioner.
19. Position the RH (outer) timing chain on the crankshaft sprocket, aligning the copper (marked) link with the timing mark on the sprocket.
20. Install the RH timing chain on the camshaft sprocket, aligning the copper (marked) link with the timing marks on the sprocket. Klj . 8 ba
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21. Position the RH timing chain tensioner arm on the dowel pin and install the RH timing chain
tensioner.
22. Remove the retaining clip from the RH timing chain tensioner.
23. Make sure that the copper (marked) chain links are lined up with the dots on the crankshaft sprockets and the camshaft sprocket.
24. Install the crankshaft sensor ring on the crankshaft. Klj . 9 ba
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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
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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
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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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