Dodge 2000 DURANGO Service Manual page 631

DN
REMOVAL AND INSTALLATION (Continued)
Fig. 74 Core Hole Plug Removal
1 – CYLINDER BLOCK
2 – REMOVE PLUG WITH PLIERS
3 – STRIKE HERE WITH HAMMER
4 – DRIFT PUNCH
5 – CUP PLUG
DISASSEMBLY AND ASSEMBLY
VALVE SERVICE
VALVE GUIDES
Measure valve stem guide clearance as follows:
(1) Install Valve Guide Sleeve Tool C-3973 over
valve stem and install valve (Fig. 75). The special
sleeve places the valve at the correct height for
checking with a dial indicator.
Fig. 75 Positioning Valve with Tool C-3973
1 – VALVE
2 – SPACER TOOL
(2) Attach Dial Indicator Tool C-3339 to cylinder
head and set it at right angle of valve stem being
measured (Fig. 76).
Fig. 76 Measuring Valve Guide Wear
1 – VALVE
2 – SPECIAL TOOL C-3339
(3) 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.
(4) Service valves with oversize stems are avail-
able as shown below.
REAMER SIZES 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).
5.2L ENGINE 9 - 121
VALVE GUIDE SIZE
8.026 - 8.052 mm
(0.316 - 0.317 in.)
8.331 - 8.357 mm
(0.328 - 0.329 in.)