Chrysler 1998 Voyager Service Manual page 1151

NS
SERVICE PROCEDURES (Continued)
Fig. 18 Intake and Exhaust Valves
VALVE GUIDE SPECIFICATION CHART
Intake Valve
Dial Indicator 0.247 mm
Reading (0.009 in.)
(Maximum):
Valve Guide Valve Guide Size
Reamer
Oversize
0.15 mm 8.125 - 8.150 mm
(0.005 in.) (0.3198 - 0.3208 in.)
0.40 mm 8.375 - 8.400 mm
(0.015 in.) (0.3297 - 0.3307 in.)
0.80 mm 8.775 - 8.800 mm
(0.030 in.) (0.3454 - 0.3464 in.)
dure of 0.15 mm (0.005 in.), 0.40 mm (0.015 in.)
and 0.80 mm (0.030 in.) so the valve guides may
be reamed true in relation to the valve seat.
After reaming guides, the seat runout should be
measured and resurfaced if necessary. See
Refacing Valves and Valve Seats.
VALVE SPECIFICATION CHART
Intake Valve (Minimum)
Stem Diameter:
Face Angle:
Valve Margin:
Head Diameter:
Length:
Exhaust Valve (Minimum)
Stem Diameter:
Face Angle:
Valve Margin:
Head Diameter:
Length:
Exhaust Valve
0.414 mm
(0.016 in.)
7.935 mm (0.3124 in.)
44.5°
0.794 mm (0.031 in.)
45.5 mm (1.79 in.)
127.2 mm (5.008 in.)
7.906 mm (0.3112 in.)
44.5°
1.191 mm (0.0469 in.)
37.5 mm (1.476 in.)
127.82 (5.032 in.)
VALVE GUIDES
NOTE: Replace cylinder head if guide does not
clean up with 0.80 mm (0.030 in.) oversize reamer,
or if guide is loose in cylinder head.
REFACING VALVES AND VALVE SEATS
The intake and exhaust valves have a 44-1/2 to 45
degree face angle. The valve seats have a 45 to 45-1/2
degree face angle. The valve face and valve seat
angles are shown in (Fig. 19).
VALVES
(1) Inspect the remaining margin after the valves
are refaced Refer to Valve Dimension Chart.
VALVE SEATS
CAUTION: Remove metal from valve seat only. Do
not remove metal from cylinder head (Fig. 20).
(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
obtained.
(2) Measure the concentricity of valve seat using
dial indicator. Total runout should not exceed 0.051
mm (0.002 in.) total indicator reading.
Fig. 19 Valve Seats
(3) Inspect the valve seat using 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. If the blue is transferred to the center of
valve face, contact is satisfactory. If the blue is trans-
ferred to top edge of valve face, lower valve seat with
a 15 degree stone. If the blue is transferred to the
bottom edge of valve face raise valve seat with a 65
degrees stone.
3.3/3.8L ENGINE 9 - 101