Dodge ram truck 3500 1996 Service Manual page 1072

9 - 82 S.2L ENGINE
B R
DISASSEMBLY AND
A S S E M B L Y (Continued)
INTAKE
VALVE
FACE
* STEM -
VALVE SPRING
RETAINER LOCK
GROOVE
EXHAUST
VALVE
J 9 2 0 9 - 1 2 7
Fig. 55 Intake and Exhaust Waives
Fig. 56 Refacing Valve Seats
(2) Measure the concentricity of valve seat using a
dial indicator. Total runout should not exceed 0.051
mm (0.002 Inch) total indicator reading.
(3) Inspect the valve seat with Prussian blue to
determine where the valve contacts the seat. To do
this, coat valve seat LIGHTLY with Prussian blue
then set valve in place. Rotate the valve with light
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
inch). The width of the exhaust seats should be
1.524-2.032 mm (0.060-0.080 inch).
VALVE SPRING INSPECTION
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 inch. Turn table of
Universals Valve Spring Tester Tool until surface is
in line with the 1-5/16 inch 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 compress­
ing 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 mea­
surements are indicated on the table for finer adjust­
ments. 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
OIL P U i P
DISASSEMBLE
(1) Remove the relief valve as follows:
(a) Remove cotter pin. Drill a 3.175 mm (1/8
inch) hole into the relief valve retainer cap and
insert a self-threading sheet metal screw.
(b) Clamp screw into a vise and while support­
ing oil pump, remove cap by tapping pump body
using a soft hammer. Discard retainer cap and
remove spring and relief valve (Fig. 58).
(2) Remove oil pump cover (Fig. 59).
(3) Remove pump outer rotor and inner rotor with
shaft (Fig. 59).
(4) Wash all parts in a suitable solvent and inspect
carefully for damage or wear.
ASSEMBLE
(1) Install pump rotors and shaft, using new parts
as required.
(2) Position the oil pump cover onto the pump
body. Tighten cover bolts to 11 N-m (95 in. lbs.)
torque.