Dodge ram truck 3500 1996 Service Manual page 1037

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3.9L ENGINE § - 47
D I S A S S E M B L Y AMD ASSEMBLY fContinued)
CONTACT
POINT
457*° - 457< c
A - SEAT WIDTH - INTAKE 1 . 0 1 6 - 1 . 5 2 4 mm (0.040 -
EXHAUST 1.524 - 2.032 mm (0.060 -
B - FACE ANGLE (INTAKE & EXHAUST) 4 3 7 / - 43 3 /<°
C - SEAT ANGLE (INTAKE & EXHAUST) 447*° - 447<°
D - CONTACT SURFACE
0.060 in.]
0.080 in.)
J9309-95
Fig. 54 Valve Face and Seat Angles
INTAKE
VALVE
STEM"
VALVE SPRING
RETAINER LOCK
GROOVE
EXHAUST
VALVE
J 9 2 0 9 - 1 2 7
Fig. 55 Intake and Exhaust Valves
pressure. I f the blue is transferred to the center of
valve face, contact is satisfactory. I f the blue is trans­
ferred to the top edge of valve face, lower valve seat
with a 15° stone. I f the blue is transferred to bottom
edge of valve face raise valve seat with a 60° stone.
(4) When seat is properly positioned the width of
intake seats should be 1.016-1.524 mm (0.040-0.060
in.). The width of the exhaust seats should be 1.524-
2.032 mm (0.060-0.080 in.).
REFACING STONE J>
Fig. 56 Refacing Valve Seats
VALVE SPRINGS
Whenever valves have been removed for inspection,
reconditioning or replacement, valve springs should
be tested. As an example the compression length of
the spring to be tested is 1-5/16 in.. Turn table of
Universal Valve Spring Tester Tool until surface is in
line with the 1-5/16 in. mark on the threaded stud.
Be sure the zero mark is to the front (Fig. 57). Place
spring over . stud on the table and lift compressing
lever to set tone device. Pull on torque wrench until
ping is heard. Take reading on torque wrench at this
instant. Multiply this reading by 2. This will give the
spring load at test length. Fractional measurements
are indicated on the table for finer adjustments.
Refer to specifications to obtain specified height and
allowable tensions. Discard the springs that do not
meet specifications.
TORQUE
WRENCH
VALVE SPRING
TESTER
9509-79
Fig. 57 Testing Valve Spring for Compressed
Length