SERVICE MANUAL
CYLINDER HEAD & VALVES
Section 3
3.
Inspect lower deck for flatness.
a.
Use a straight edge long enough to span
both length and width of HEAD. Follow
checking pattern shown below.
Figure 18. - Cylinder Head Checking Pattern-
b.
Insert feeler gauge under straight edge at
each check point.
c.
Resurface HEAD if 0.15 mm (0.006 in.)
feeler gauge can be inserted under straight
edge when checking the length or 0.01 mm
(0.004 in.) feeler gauge can be inserted
under- straight edge when checking width.
NOTE: SUDDEN CHANGE IN CONTOUR SUCH AS
SCRATCHES, GOUGES ETC. MUST NOT EXCEED
0.05 mm (0.002 in.) IN DEPTH.
4.
Cylinder head resurfacing procedure.
a.
With a micrometer, measure distance from
upper deck (valve cover seating surface) to
lower deck (head gasket contact surface).
As shown in Fig. 19.
Minimum Allowable
Deck to Deck Dimension
106.38 mm (4.188 in)
Figure 19. - Measuring Cylinder Head
b.
DO NOT grind more than 0.25 mm (0.010
in) stock or go below the
minimum
allowable deck to deck dimension, or a
cracked head at the lower deck may result.
c.
After head resurfacing, grind valve seats so
installed
valves
meet
valve
recession
specifications of:
0.00 mm (0.000 in)
0.36 mm (0.014 in)
d.
With valve assemblies installed, measure
valve recession as shown in Fig. 20.
Figure 20. - Measuring Valve Recession
e.
Replace
valve
seat
inserts
if
valve
recession
exceeds
maximum
specifications.
CGES-185-3
PRINTED IN UNITED STATES OF AMERICA
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