Chrysler Stratus RHD 1997 Interactive Electronic Service Manual page 864

MIDDLE BOTTOM TOP
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REMOVAL AND INSTALLATION (Continued)
(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. 38). Refer to (Fig. 39) for specifications.
Replace guides if they are not within specification.
Fig. 38 Checking Wear on Valve Guide—Typical
Fig. 39 Valve Guide Specifications
(3) Check valve guide height (Fig. 40).
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.
SUREMENT VALVE CUT AWAY VIEW OF GUIDE TIONS LOCA- MEA- VALVE SPRING HEAT
Place spring over stud on the table and lift compress-
ing lever to set tone device (Fig. 41). 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 Closed Nominal Force— 67 lbs. @ 39.8 mm
(1.57 in.)
• Valve Open Nominal Force— 160 lbs. @ 32.6 mm
(1.28 in.)
(2)
square and surface plate, check springs from both
ends. If the spring is more than 1.5 mm (1/16 inch)
out of square, install a new spring.
REFACING VALVES AND VALVE SEATS
(1) The intake and exhaust valve seats and valve
face have a 45 degree angle.
TESTER SPRING (.521 - .541 IN.) 13.25 - 13.75 MM VALVE GUIDE TORQUE WRENCH
2.0L SOHC ENGINE
Fig. 40 Valve Guide Height
Fig. 41 Testing a Valve Spring
Verify springs are not distorted with a steel
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