Chrysler neon 1997 Service Manual page 1213

BOTTOM MIDDLE TOP
9 - 42 2.0L SOHC ENGINE
DISASSEMBLY AND ASSEMBLY (Continued)
VALVE SERVICE WITH THE CYLINDER HEAD
REMOVED
REMOVAL
(1) With cylinder head removed, compress valve
springs using Special Tool C-3422–B or equivalent.
(2) Remove valve retaining locks, valve spring
retainers, valve stem seals and valve springs.
(3) Before removing valves, remove any burrs
from valve stem lock grooves to prevent dam-
age to the valve guides. Identify valves to insure
installation in original location.
VALVE INSPECTION
(1) Clean valves thoroughly and discard burned,
warped and cracked valves.
(2) Measure valve stems for wear. Measure stem
about 60 mm beneath the valve lock grooves.
(3) If valve stems are worn more than 0.05 mm
(.002 in.), replace valve.
VALVE GUIDES
(1) Remove carbon and varnish deposits from
inside of valve guides with a reliable guide cleaner.
(2) Using a small hole gauge and a micrometer,
measure valve guides in 3 places top, middle and bot-
tom (Fig. 91). Refer to (Fig. 92) for specifications.
Replace guides if they are not within specification.
Fig. 91 Checking Wear on Valve Guide—Typical
Fig. 92 Valve Guide Specifications
(3) Check valve guide height (Fig. 93).
SUREMENT VALVE CUT AWAY VIEW OF GUIDE TIONS LOCA- MEA-
TESTING VALVE SPRINGS
(1) Whenever valves have been removed for inspec-
tion, reconditioning or replacement, valve springs
should be tested Special Tool C-647. As an example,
the compression length of the spring to be tested is
33.34 mm (1-5/16 inches). Turn tool table until sur-
face is in line with the 33.34 mm (1-5/16 inch) mark
on the threaded stud and the zero mark on the front.
Place spring over stud on the table and lift compress-
ing lever to set tone device (Fig. 94). Pull on torque
wrench until ping is heard. Take reading on torque
wrench at this instant. Multiply this reading by two.
This will give the spring load at test length. Frac-
tional measurements are indicated on the table for
finer adjustments. Discard the springs that do not
meet specifications. The Following specifications
apply to both intake and exhaust valve springs. VALVE
• Valve Closed Nominal Force— 67 lbs. @ 39.8 mm
(1.57 in.)
• Valve Open Nominal Force— 160 lbs. @ 32.6 mm
(1.28 in.)
Fig. 93 Valve Guide Height
TESTER SPRING TORQUE WRENCH
Fig. 94 Testing a Valve Spring
PL