Removal - Chrysler 300M Service Manual

9 - 30 ENGINE
INTAKE/EXHAUST VALVES & SEATS (Continued)
Fig. 28 Valve Face and Seat
1 - SEAT WIDTH
2 - FACE ANGLE
3 - SEAT ANGLE
4 - SEAT CONTACT AREA
(3) Inspect the valve seat with Prussian blue to
determine where the valve contacts the seat. To do
this, coat valve seat LIGHTLYwith Prussian blue
then set valve in place. Rotate the valve with light
pressure. If the blue is transferred to the center of
valve face, contact is satisfactory. If the blue is trans-
ferred to top edge of valve face, then lower valve seat
with a 15 degree stone. If the blue is transferred to
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.
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
(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.
Fig. 30 Valve Spring Identification
1 - YELLOW DYE
2 - ORANGE DYE

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.
LH