Section 01 ENGINES (1503 4-TEC)
Subsection 06 (CYLINDER HEAD)
Inspection
Valve Stem Seal
Inspection of valve stem seals is not needed be-
cause new seals should always be installed when-
ever cylinder head is removed.
Valve
Inspect valve surface, check for abnormal stem
wear and bending. If so, replace by a new one.
Valve Stem and Valve Guide Clearance
Measure valve stem and valve guide in three
places, using a micrometer and a small bore
gauge.
NOTE: Clean valve guide to remove carbon de-
posits before measuring.
Change valve if valve stem is out of specification
or has other damages such as wear or friction sur-
face.
A
R610motr126A
A. Valve stem diameter
VALVE STEM DIAMETER
NEW MINIMUM
Exhaust 5.946 mm (.2341 in)
Intake 5.961 mm (.2347 in)
NEW MAXIMUM
Exhaust 5.960 mm (.2346 in)
Intake 5.975 mm (.2352 in)
SERVICE LIMIT
Exhaust
Intake
5.93 mm (.233 in)
Replace valve guide if it is out of specification or
has other damages such as wear or friction sur-
face. Refer to valve guide replacement below.
VALVE GUIDE DIAMETER
NEW MINIMUM
Exhaust
Intake
5.994 mm (.2359 in)
NEW MAXIMUM
Exhaust
Intake
6.018 mm (.2369 in)
SERVICE LIMIT
Exhaust
Intake
6.060 mm (.2386 in)
Valve Guide Replacement
CAUTION: Do not heat cylinder head for this
procedure.
CAUTION: The sharp edge near the top of the
valve guide must be machined away. Other-
wise it will foul the valve guide hole in the cylin-
der head and destroy the cylinder head, as the
valve guide is removed.
Use a special reamer as far as the top of the notch.
smr2005-036 83
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