Chrysler RAM TRUCK 2500 1994 Service Manual page 855

9 - 134 5.9L (DIESEL) ENGINE •
COMBUSTION
VALVE SEAT DEPTH
10.40 ±0.10 mm (0.4094 ± 0.004 inch)
VALVE SEAT WIDTH
47.0 ±0.013 mm (1.8504 ±0.0005 in)
M A X I M U M RADIUS
0.40 mm (0.0157 inch) M A X .
SURFACE FINISH
3.2 micrometers (128.0 mkrotnch)
J9409-115
Fig. 12 Machining for Service Valve Seats—Intake
Valve
Install the valves i n their respective bores and
measure the depth again (Fig. 14). The valve depth
limit is 0.99-1.52 mm (0.039-0.060 inch). Replace the
valve i f the depth is over the limit.
Apply a light coat of valve lapping compound to
each valve and lap each valve to its companion seat.
Remove the valves and clean the lapping compound
from the valve and seats.
Measure the valve seat width indicated by the
lapped surface (Fig. 15). The width limits are 1.5-2.0
mm (0.060-0.080 inch). I f required, grind lower area
with 60° stone and upper area with 15° stone (Fig.
15). Be sure to center the seat on the valve face.
Maintain the valve seat within limits.
SERVICE VALVE SEAT REPLACEMENT
To replace service seat inserts, machine the insert
in the same manner as i f machining out the internal
seat. Hold the same tolerances and follow the same
installation procedures.
INSTALLATION
(1) Clean all cylinder head components before as­
sembling.
(2) Install the valve stem seals (Fig. 16). The in­
take and exhaust valve seals are the same.
VALVE SEAT DEPTH
10.20 ±0.10 mm (0.4015 ± 0.004 inch)
VALVE SEAT WIDTH
43.65 ±0.013 mm (1.7185 ±0.0005 in)
M A X I M U M RADIUS
0.40 mm (0.0157 inch) M A X .
SURFACE FINISH
3.2 micrometers (128.0 microinch)
J9409-116
Fig. 13 Machining for Service Valve Seats—Exhaust
Valve
MIN.
- 0 . 9 9 0 mm ( 0 . 0 3 9 inch)
MAX. - 1.520 mm ( 0 . 0 6 0 inch)
J 9 1 0 9 - 4 4
Fig. 14 Valve Depth with Seat Insert
(3) Lubricate the stems with SAE 90W oil before
installing the valves. Install the valves i n the same
positions as removed.
(4) Compress the valve spring after installing the
spring and retainer (Fig. 17).
(5) Install new valve collets and release the spring
tension (Fig. 17).