Section 05 ENGINE (4-TEC)
Subsection 08 (CYLINDER HEAD AND VALVES)
SMR2003-020_05_08A.FM 05-08-13
Remove valve stem seal no. 28 with special pliers
such as Snap-on YA 8230.
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 depos-
its before measuring.
Change valve if valve stem is out of specification
or has other damages such as wear or friction sur-
face.
A. Valve stem diameter
R610motr125A
VALVE STEM DIAMETER mm (in)
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
5.93 mm (.233 in)
Intake
A
R610motr126A