the bottom edge of valve face, then raise valve seat
with a 65 degree stone.
NOTE: Valve seats which are worn or burned can
be reworked, provided that correct angle and seat
width are maintained. Otherwise cylinder head must
be replaced.
(4) When seat is properly positioned the width of
the intake seats should be 0.75 to 1.25 mm (0.0296 to
0.0493 in.) and exhaust seats should be 1.25 to 1.75
mm (0.049 to 0.069 in.) (Fig. 28).
VALVE AND SPRING INSTALLED HEIGHT
(1) Coat valve stems with clean engine oil and
insert them in cylinder head.
(2) If valves or seats have been refaced, check
valve tip height (A) (Fig. 29). If valve tip height is
greater than 43.65 mm (1.7185 in.) intake or 45.98
mm (1.8102 in.) exhaust, grind valve tip until within
specifications. Make sure measurement is taken from
cylinder head surface to the top of valve stem.
(3) Install valve seal/spring seat assembly over
valve guides on all valve stems (Fig. 31). Ensure that
the garter spring is intact around the top of the rub-
ber seal.
(4) Place valve spring (color-coded end facing up
(Fig. 30)) and valve retainer into position on spring
seat (Fig. 31).
(5) Compress valve springs with valve spring com-
pressor C-3422-D and adapter 6526 (Refer to 9 -
ENGINE - SPECIAL TOOLS), install locks and
release tool.
(6) If valves and/or seats are refaced, measure the
installed height of springs (B) (Fig. 29). Measure-
ments are taken from top of spring seat to the bot-
tom surface of spring retainer. If height is greater
than 38.75 mm (1.5256 in.), install a 0.762 mm
(0.030 in.) spacer in head counterbore under the
valve spring seat to bring spring height back within
specification.
REMOVAL
(1) Remove valve spring. (Refer to 9 - ENGINE/
CYLINDER HEAD/VALVE SPRINGS - REMOVAL)
(2) Before removing valve, remove any burrs
from valve stem lock grooves to prevent dam-
age to the valve guides. Identify valves to insure
installation in original location.
(3) Remove valve(s) from cylinder head.
CLEANING
(1) Clean all valves thoroughly and discard
burned, warped and cracked valves.
Fig. 28 Valve Face and Seat
1 - SEAT WIDTH
2 - FACE ANGLE
3 - SEAT ANGLE
4 - SEAT CONTACT AREA
Fig. 29 Checking Valve Tip Height and Valve Spring
Installed Height
1 - SPRING RETAINER
2 - GARTER SPRING
3 - VALVE SPRING SEAT TOP
4 - CYLINDER HEAD SURFACE
Fig. 30 Valve Spring Identification
1 - YELLOW DYE
2 - ORANGE DYE
LH ENGINE 3.5L 9 - 117
INTAKE/EXHAUST VALVES & SEATS (Continued)
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