Dodge Dakota Sport 2001 Service Manual page 1115

9 - 86 ENGINE 3.9L
INTAKE/EXHAUST VALVES & SEATS (Continued)
Fig. 12 Measuring Valve Guide Wear
1 - VALVE
2 - SPECIAL TOOL C-3339
VALVE GUIDES
Service valves with oversize stems are available.
Refer to REAMER SIZES CHART
REAMER SIZES CHART
REAMER O/S
0.076 mm
(0.003 in.)
0.381 mm
(0.015 in.)
(1) Slowly turn reamer by hand and clean guide
thoroughly before installing new valve. Ream the
valve guides from standard to 0.381 mm (0.015
in.). Use a two step procedure so the valve
guides are reamed true in relation to the valve
seat:
• Step 1—Ream to 0.0763 mm (0.003 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. 13).
VALVE GUIDE SIZE
8.026 - 8.052 mm
(0.316 - 0.317 in.)
8.331 - 8.357 mm
(0.328 - 0.329 in.)
Fig. 13 Valve Face and Seat Angles
1 - CONTACT POINT
A,B,C and D Refer to VALVE FACE AND VALVE SEAT ANGLE
CHART
VALVE FACE AND VALVE SEAT ANGLE CHART
ITEM DESCRIPTION
A SEAT WIDTH
INTAKE
EXHAUST
B FACE ANGLE
(INT. AND EXT.)
C SEAT ANGLE
(INT. AND EXT.)
D CONTACT
SURFACE
AN
SPECIFICATION
1.016 - 1.524 mm
(0.040 - 0.060 in.)
1.524 - 2.032 mm
(0.060 - 0.080 in.)
43¼° - 43¾°
44¼° - 44¾°
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