timing FORD MUSTANG 2003 Owners Manual

51. Remove the RH and the LH timing chains and crankshaft sprocket.
52. Remove the RH and LH timing chain guides.
53. Remove the RH and LH cylinder heads.
54. Remove the oil filter adapter.
1. Remove the oil filter.
2. Remove the bolts.
3. Remove the oil filter adapter.
4. Remove the gasket. Klj . 16 ba
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Install the special tool.
2. Remove the exhaust camshaft sprocket and the intake camshaft bolt, washer and spacer.
3. Compress the tensioner and install a lock pin.
4. Remove the special tool.
5. Remove the timing chain and the camshaft sprocket. Klj . 2 ba
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Install the tensioner.
11. CAUTION: Timing marks must be at 12 o'clock and indexed at 6 o'clock.
Install the camshaft sprockets and the chain as an assembly.
12. Install the special tool.
13. Install the camshaft spacer, washer and bolt, and hand- tighten the bolt. Klj . 9 ba
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21. Position the oil pump and tighten the bolts in the sequence shown.
22.
NOTE: Install a new O- ring if necessary.
Install the oil pump screen cover and tube.
23. Install the cylinder head gaskets.
24. CAUTION: The camshafts must be positioned so the camshaft keyway is 90 degrees
from the valve cover gasket surface to avoid damage to valves and pistons during timing Klj . 9 ba
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procedures.
Make sure the camshaft timing sprockets are positioned correctly.
25. NOTE: The LH is shown; the RH is similar.
NOTE: Lubricate the bolt heads and threads. Use clean engine oil.
Install the LH and RH cylinder heads and tighten the bolts in six stages in the sequence shown. zStage 1: tighten to 40 Nm (30 lb- ft).
z Stage 2: tighten an additional 90 degrees.
z Stage 3: loosen the bolts a minimum of one full turn.
z Stage 4: tighten to 40 Nm (30 lb- ft).
z Stage 5: tighten an additional 90 degrees.
z Stage 6: tighten an additional 90 degrees.
26. CAUTION: Timing chain procedures must be followed exactly or damage to valves
and pistons will result.
Compress the tensioner plunger, using a vise. Klj . 10 ba
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27. Install a retaining clip on the tensioner to hold the plunger in during installation.
28. Remove the tensioner from the vise.
29. If the copper links are not visible, mark two links on one end and one link on the other end, and
use as timing marks.
30. Install the timing chain guides.
31. Rotate the LH camshaft timing sprocket until the timing mark is approximately at the 12 o'clock Klj . 11 ba
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position. Rotate the RH camshaft timing sprocket until the timing mark is at approximately 11
o'clock position.
32. CAUTION: Unless otherwise instructed, at no time when the timing chains are
removed and the cylinder heads are installed is the crankshaft or camshaft to be rotated.
Severe piston and valve damage will occur.
CAUTION: Rotate the crankshaft counterclockwise only. Do not rotate past position
shown or severe piston and/or valve damage will occur.
Using the special tool, position the crankshaft.
zRemove the special tool.
33. Install the crankshaft sprocket with the flange facing forward.
34. Install the LH and RH timing chain onto the crankshaft sprocket, aligning the one copper (or marked) link on the timing chain with the slot on the crankshaft sprocket. Klj . 12 ba
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35.
NOTE: If necessary, adjust the camshaft sprocket slightly to obtain timing mark alignment.
Position the RH timing chain on the camshaft sprocket. Make sure the two copper- colored links
align with the camshaft sprocket timing mark.
36. As a post- check, verify correct alignment of all timing marks.
37. Position the LH and RH timing chain tensioner arms on the dowel pins. Position the timing chain tensioner assemblies, and install the bolts.
38. Remove the retaining clips from the timing chain tensioners. Klj . 13 ba
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SPECIFICATIONS
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual General Specifications
Item Specification
Base ignition timing TBD
Firing order 1-4-2-5-3-
6 Spark plug gap mm (in) 1.32-
1.42 (0.052- 0.056) Spark plug type production LH AWSF-
42E Spark plug type production RH AWSF-
42EG Spark plug type service AWSF-
42EE Silicone Brake Caliper Grease and Dielectric Compound D7AZ-19A331-
A ESE-
M1C171- A
Torque Specifications Description Nm lb-
ft lb-
in Spark plugs 15 11 —
Ignition coil bolts 7 — 52 Klj . 1 ba
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DESCRIPTION AND OPERATION
Engine Ignition
The ignition coil (12029), which is mounted on the upper intake manifold, can be described as a coil
pack containing three separate coil units. Each coil unit is individually controlled by the powertrain
control module (PCM) (12A650) through separate wire leads. Each coil unit activates two spark plugs
wired in a series by the spark plug wires (12286).
zOne spark plug activates on the compression stroke and uses the majority of the ignition coil's
stored energy.
z The other spark plug activates on the exhaust stroke and uses very little of the ignition coil's
stored energy.
z Because the pairs of spark plugs are connected in a series, one spark will travel from ground to
the electrode while the other spark will travel from the electrode to ground.
The spark plug (12405):
zchanges the high voltage pulse into a spark which ignites the fuel and air mixture.
z originally equipped on the vehicle has a platinum- enhanced active electrode for long life.
The crankshaft position (CKP) sensor (6C315):
NOTE: Initial engine ignition timing is set at 10 degrees ± 2 degrees before top dead center (BTDC)
and is not adjustable.
zis a variable reluctance sensor triggered by a 36- minus-1 tooth trigger pulse wheel located on
the crankshaft (6303) inside the engine front cover (6019).
The sine wave type signal generated from the crankshaft position sensor provides two types of
information:
zposition of the crankshaft in 10 degree increments
z the crankshaft speed (rpm)
The powertrain control module (PCM) (12A650) uses this information to determine ignition coil turn ON
and turn OFF times and misfire detection.
For additional information, refer to Section 303 - 14 .
SECTION 303-
07A: Engine Ignition — 3.8L 2003 Mustang Workshop Manual Klj . 1 ba
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