Dodge Dakota Sport 2001 Service Manual page 1050

AN
CYLINDER HEAD (Continued)
STANDARD PROCEDURE—VALVE GUIDE
WEAR - MEASURING
Measure valve stems for wear. If wear exceeds
0.051 mm (0.002 in.), replace the valve.
Measure valve stem guide clearance as follows:
(1) Install Valve Guide Sleeve Tool C-3973 over
valve stem and install valve (Fig. 10). The special
sleeve places the valve at the correct height for
checking with a dial indicator.
Fig. 10 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 angles to valve stem being
measured (Fig. 11).
Fig. 11 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 in.). Ream the guides for valves with oversize
stems if dial indicator reading is excessive or if the
stems are scuffed or scored.
STANDARD PROCEDURE—VALVE GUIDE
SERVICE
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).
REMOVAL
This procedure can be done with the engine in or
out of the vehicle.
(1) Disconnect negative cable from battery.
WARNING: DO NOT REMOVE THE CYLINDER
BLOCK DRAIN PLUGS OR LOOSEN THE RADIATOR
DRAIN COCK WITH THE SYSTEM HOT AND PRES-
SURIZED BECAUSE SERIOUS BURNS FROM THE
COOLANT CAN OCCUR.
(2) Drain the coolant (Refer to 7 - COOLING -
STANDARD PROCEDURE) and disconnect the hoses
at the engine thermostat housing. DO NOT waste
reusable coolant. If the solution is clean and is being
drained only to service the engine or cooling system,
drain the coolant into a clean container for reuse.
(3) Remove the air in-let hose and resonator
assembly.
(4) Remove the engine cylinder head cover (Refer
to 9 - ENGINE/CYLINDER
HEAD COVER(S) - REMOVAL).
(5) Remove the capscrews, bridge and pivot assem-
blies and rocker arms (Fig. 12).
(6) Remove the push rods (Fig. 12). Retain the
push rods, bridges, pivots and rocker arms in
the same order as removed.
(7) Loosen the accessory drive belt at the power
steering pump bracket, if equipped or at the idler
pulley bracket (Refer to 7 - COOLING/ACCESSORY
DRIVE/DRIVE BELTS - REMOVAL).
ENGINE 2.5L 9 - 21
VALVE GUIDE SIZE
8.026 - 8.052 mm
(0.316 - 0.317 in.)
8.331 - 8.357 mm
(0.328 - 0.329 in.)
HEAD/CYLINDER