Chrysler Sebring 2004 Service Manual page 1103

9 - 176 ENGINE 2.7L DOHC
INTAKE/EXHAUST VALVES & SEATS (Continued)
(2) Measure the concentricity of valve seat using
dial indicator. Total runout should not exceed 0.051
mm (0.002 inch.) total indicator reading.
Fig. 32 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, con-
tact is satisfactory. If the blue is transferred 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 1.00 to 1.50 mm (0.0394 to 0.0591 in.) and
exhaust seats should be 1.25 to 1.75 mm (0.049 to
0.069 in.) (Fig. 32).
(5) Check the valve spring installed height after
refacing the valve and seat (Fig. 33).
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. 33). If valve tip height for
intake valve is greater than 47.59 (1.8737 in.) or
49.14 (1.9347 in.) for exhaust valve, 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. 34). Ensure that
the garter spring is intact around the top of the rub-
ber seal.
(4) Position valve springs and retainer on spring
seat (Fig. 34).
Fig. 33 Checking Valve Tip Height and Valve
1 - SPRING RETAINER
2 - GARTER SPRING
3 - VALVE SPRING SEAT TOP
4 - CYLINDER HEAD SURFACE
(5) Compress valve spring with a valve spring
compressor.
(6) Install retainer locks and release tool.
(7) If valves and/or seats are refaced, measure the
installed height of springs (B) (Fig. 33). Measure-
ment is taken from top of spring seat to the bottom
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. 34 Valve Seal and Spring
1 - VALVE RETAINING LOCKS
2 - VALVE SPRING RETAINER
3 - VALVE SPRING
4 - VALVE SEAL AND VALVE SPRING SEAT ASSEMBLY
5 - VALVE
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