Heads FORD MUSTANG 2003 User Guide

Both cylinder heads
58. CAUTION: Do not use metal scrapers, wire brushes, power abrasive discs or other
abrasive means to clean the sealing surfaces. These tools cause scratches and gouges
that make leak paths. Use a plastic scraping tool to remove all traces of the head gasket.
CAUTION: Observe all warnings or cautions and follow all application directions
contained on the packaging of the silicone gasket remover and the metal surface prep.
NOTE: If there is no residual gasket material present, metal surface prep can be used to clean
and prepare the surfaces.
Clean the cylinder head- to-cylinder block mating surfaces of both the cylinder head and the
cylinder block. 1. Remove any large deposits of silicone or gasket material with a plastic scraper.
2. Apply silicone gasket remover, following package directions, and allow to set for several minutes.
3. Remove the silicone gasket remover with a plastic scraper. A second application of silicone gasket remover may be required if residual traces of silicone or gasket material
remain.
4. Apply metal surface prep, following package directions, to remove any remaining traces of oil or coolant, and to prepare the surfaces to bond with the new gasket. Do not attempt
to make the metal shiny. Some staining of the metal surfaces is normal.
59. NOTE: The straightedge used must be flat within 0.0051 mm (0.0002 in) per foot of tool length.
Support the cylinder head on a bench with the head gasket side up. Inspect all areas of the
deck face with a straightedge, paying particular attention to the oil pressure feed area. The
cylinder head must not have depressions deeper than 0.0254 mm (0.001 in) across a 38.1 mm
(1.5 in) square area, or scratches more than 0.0254 mm (0.001 in) . Klj . 20 ba
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53. Remove the RH and LH timing chain tensioner (RH shown, LH similar).
1. Remove the bolts.
2. Remove the timing chain tensioners.
3. Remove the timing chain tensioner arms.
54. 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 can occur.
CAUTION: Do not remove the special tool from the camshafts.
Remove the LH and RH timing chains and the crankshaft sprocket. zRemove the RH timing chain from the 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 from the crankshaft sprocket. Klj . 18 ba
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55.
NOTE: The LH is shown and the RH is similar.
Remove the bolts and the timing chain guides.
56. NOTE: One side shown, other side similar.
Install the lifting handles to the RH and LH cylinder heads. Klj . 19 ba
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57.
CAUTION: New cylinder head bolts must be installed. They are tighten- to-yield
designed and cannot be reused.
CAUTION: Place cylinder head on cardboard or wood surface to prevent damage to
the joint face.
Remove the RH and LH cylinder heads. 1. Remove the bolts.
2. Remove the cylinder heads.
58. CAUTION: Do not use metal scrappers, wire brushes, power abrasive discs or other
abrasive means to clean gasket surfaces. These tools cause scratches and gouges that
make leak paths. Use a plastic scrapping tool to remove all traces of the head gasket
(6051).
Clean and inspect all of the sealing surfaces. For additional information, refer to Section 303 -
00 .
59. Remove the oil pump screen cover and tube, and the spacer. Klj . 20 ba
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CAUTION: Camshaft keyways must maintain a 90 degree clocked position relative
to the valve cover rail.
CAUTION: To prevent piston crown and valve damage the crankshaft keyway must
be clocked at 270° (45° BTDC) before the installation of the cylinder head assembly.
NOTE: Crankshaft must be rotated clockwise only.
Align the keyways as shown.
32. NOTE: Position the RH and the LH cylinder heads over the dowels on the cylinder head
gaskets.
NOTE: The LH is shown the RH is similar.
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. Klj . 14 ba
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39. 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.
40. CAUTION: Unless otherwise instructed, do not rotate either the crankshaft or the
camshafts, when the timing chains are removed and the cylinder heads are installed.
Severe piston and valve damage will occur.
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 . 17 ba
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INSTALLATION
Cylinder Heads
SECTION 303-
01B: Engine — 4.6L (2V) 2003 Mustang Workshop Manual Special Tool(s)
Installer, Crankshaft Vibration
Damper
303-
102 (T74P-6316- B) Installer, Front Cover Oil Seal
303-
335 (T88T-6701- A) Holding Tool, Crankshaft
303-
448 (T93P-6303- A) Spreader Bar
303-
D089 (D93P-6001- A3) Lifting Bracket Set, Engine
303-
D074 (D91P-6001- A) Strap Wrench
303-
D055 (D85L-6000- A) or
equivalent Compressor, Valve Spring
303-
567 (T97P-6565- AH) Compressor Spacer, Valve
Spring Klj . 1 ba
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Both cylinder heads
1. CAUTION: The gasket sealing surfaces on the cylinder head and cylinder block
must be clean. For additional information, refer to Cylinder Heads in the Removal portion
of this section.
CAUTION: The use of sealing aids (aviation cement, copper spray and glue) is not
permitted. The gasket must be installed dry.
CAUTION: The new gasket has a film coating which is crucial to the gasket's ability
to seal correctly. Do not scratch the gasket.
NOTE: RH head gasket shown; LH head gasket similar.
Install the head gasket over the dowel pins. 303-
382 (T91P-6565- AH) Remover/Installer, Cylinder
Head
303-
572 (T97T-6000- A)
Material Item Specification
Motorcraft Silicone Gasket
Remover
ZC-
30 —
Motorcraft Metal Surface Prep
ZC-
31 —
Hydraulic Chain Tensioner
Retaining Clip
1L3Z-6P250-
AA —
Silicone Gasket and Sealant
F7AZ-
19554- EA or equivalent WSE-
M4G323-
A4 Super Premium SAE 5W-20
Engine Oil
XO- 5W20- QSP or equivalent WSS-
M2C153-
H Klj . 2 ba
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Both cylinder heads
49. Inspect O- ring seals and install new O- ring seals as necessary.
50. Install the coolant bypass tube. 1. Install the bypass tube.
2. Install the nut.
51. Install the intake manifold and gaskets. Tighten the bolts in the sequence shown. Klj . 18 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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