Dodge dakota 2002 Service Manual page 1624

DR
INTAKE/EXHAUST VALVES &
SEATS
DESCRIPTION
The valves (Fig. 13) are arranged in-line and
inclined 18°. The rocker pivot support and the valve
guides are cast integral with the heads.
Fig. 13 Intake and Exhaust Valves—8.0L Engine
1 - MARGIN
2 - VALVE SPRING RETAINER LOCK GROOVE
3 - STEM
4 - FACE
STANDARD PROCEDURE
VALVE SERVICE
VALVE GUIDES
Measure valve stem guide clearance as follows:
(1) Install Black Valve Guide Sleeve Tool C-6819
over valve stem for the INTAKE valve and install
valve (Fig. 14). The special sleeve places the valve at
the correct height for checking with a dial indicator.
(2) Install Silver Valve Guide Sleeve Tool C-6818
over valve stem for the EXHAUST valve and install
valve. The special sleeve places the valve at the cor-
rect height for checking with a dial indicator.
(3) Attach Dial Indicator Tool C-3339 to cylinder
head and set it at right angle of valve stem being
measured (Fig. 15).
(4) Move valve to and from the indicator. The total
dial indicator reading should not exceed 0.432 mm
(0.017 inch). Ream the guides for valves with over-
size stems if dial indicator reading is excessive or if
the stems are scuffed or scored.
Service valves with oversize stems are available as
shown below
Fig. 14 Positioning Valve Spacer Tool (Typical)
1 - VALVE
2 - SPACER TOOL
Fig. 15 Measuring Valve Guide Wear
1 - VALVE
2 - SPECIAL TOOL C-3339
REAMER SIZE CHART
REAMER O/S
0.076 mm
(0.003 in.)
0.381 mm
(0.015 in.)
(5) 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
inch). Use a 2 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).
ENGINE 8.0L 9 - 375
VALVE GUIDE SIZE
8.026 - 8.052 mm
(0.316 - 0.317 in.)
8.331 - 8.357 mm
(0.316 - 0.329 in.)