Dodge RAM TRUCK 1500 1995 Service Manual page 932

9 - 88 5.9L ENGINE B R
oversize stems if dial indicator reading is excessive
or if the stems are scuffed or scored.
Service valves with oversize stems are available
(Fig. 7).
Inner O/S
Valve Guide Size
0.076 ram
8.026 - 8.052 mm
(0.003 in.) (0.316 -0.317 in.)
0.381 mm
8.331 -8.357 mm
(0.0151a) (0.328-0.329 in.)
_\ J09-30
Fig. 7 Reamer Sizes
Slowly turn reamer by hand and clean guide thor­
oughly before installing new valve. Ream t h e valve
guides from standard t© 0.381 m m (0.015 Inch).
Use a 2 step procedure so t h e valve guides a r e
reamed true in relation to t h e valve seats
• Step 1—Ream to 0.0768 mm (0.008 inch).
• Step 2—Ream to 0.381 mm (0,015 inch).
REFACING VALVES AND VALVE SEATS
The intake and exhaust valves have a 43-1/4° to
43-3/4° face angle and a 44-1/4° to 44-3/4° seat angle
(Fig. 8).
CONTACT
POINT
/
/ :0 ; 0 /
l Jit
tt
s/j'L' : WIS
A - SEAT WIDTH - INTAKE 1.016-1.524 mm (0.040 - 0.060 in.|
EXHAUST 1.524 - 2.032 mm (0.060 - 0.080 in.)
B - FACE ANGLE (INTAKE & EXHAUST) 437.° -
43 3 /4°
C - SEAT ANGLE (INTAKE I EXHAUST) 44V/ - 44 3 //
D - CONTACT SURFACE
J9309-95
Fig. 8 Valve Face and Seat Angles
WftlWES
Inspect the remaining margin after the valves are
refaced (Fig. 9). Valves with less than 1.190 mm
(0.047 inch) margin should be discarded.
INTAKE
VALVE
VALVE SPRING
RETAINER LOCK
GROOVE
EXHAUST
VALVE
J9209-127
Fig. 9 Intake and Exhaust Valves
VALVE SEATS
CAUTION: DO NOT un-shroud waives during valve
seat refacing (Fig. 10).
A
,REFACING STONE
MUST NOT CUT
VALVE SHROUD
RK635
Fig. 10 Refacing Valve Seats
(1) When refacing valve seats, it is important that
the correct size valve guide pilot be used for reseat­
ing stones. A true and complete surface must be ob­
tained.
(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 de­
termine 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.
If the blue is transferred to the center of valve face,
contact is satisfactory. If the blue is transferred to
the top edge of valve face, lower valve seat with a 15°
stone. If the blue is transferred to bottom edge of
valve face raise valve seat with a 60° stone.