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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.
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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removed and the cylinder heads are installed is the crankshaft or the 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 or valve damage will occur.
Using the special tool, position the crankshaft.
7. Remove the special tool.
8. Install the crankshaft sprocket with the flange facing forward.
9. NOTE: LH timing chain shown; RH similar.
Install the LH timing chain onto the crankshaft sprocket, aligning the one copper link on the
timing chain with the slot on the crankshaft sprocket.
10. Verify the camshaft sprocket to copper link alignment. Klj . 5 ba
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11.
NOTE: LH shown; RH similar.
Position the tensioner arms and tensioners, and install the bolts.
12. Remove the retaining clips from the timing chain tensioners.
13. Position the crankshaft sensor ring on the crankshaft.
14. Install the engine front cover. For additional information, refer to Engine Front Cover in this
section. Klj . 6 ba
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Klj . 7 ba
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IN-
VEHICLE REPAIR
Valve — Springs, Retainer and Valve Stem Seal
Removal 1. Remove the roller followers. For additional information, refer to Roller Followers in this section.
2. Remove the spark plugs. For additional information, refer to Section 303 - 07C .
3. Position the piston of the cylinder being serviced at the bottom of the stroke.
4. CAUTION: If air pressure has forced the piston to the bottom of the cylinder any
loss of air pressure will allow the valve to fall into the cylinder. If air pressure must be
removed support the valve prior to removal. Use compressed air in the cylinder to hold both valves in position. SECTION 303-
01D: Engine — Mach I 4.6L (4V) 2003 Mustang Workshop Manual Special Tool(s)
Compressor, Valve Spring
303-
452 (T93P-6565- AR) Installer, Valve Stem Oil Seal
303-
383 (T91P-6571- A) Compressor, Valve Spring
303-
567 (T97P-6565- AH) Spacer, Valve Spring
Compressor
303-
382 (T91P-6565- AH) Klj . 1 ba
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5. Using the special tool, compress the intake valve spring.
6.
NOTE: Valve stem seals should be visually inspected if new seals are not installed.
Remove the valve spring retainer keys, the valve spring retainer, the valve spring and the valve
stem seal.
7. Using the special tool, compress the exhaust valve spring.
8. NOTE: Valve stem seals should be visually inspected if new seals are not installed. Klj . 2 ba
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Remove the valve spring retainer keys, the valve spring retainer, the valve spring and the valve
stem seal.
Installation 1. Using the special tools, install the new intake valve stem seals.
2. Using the special tools, install the new exhaust valve stem seals.
3. Install the Valve Spring Compressor Spacer between the valve spring coils to protect the intake valve stem seal from damage. Klj . 3 ba
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