Dodge RAM TRUCK 1500 1995 Service Manual page 901

B R 5.2L ENGINE 9 - 57
(11) Follow the same procedure on the remaining 1
cylinders using the firing sequence 1-8-4=8-6-5-7-2.
Make sure piston in cylinder is at TDC on the valve
spring that is being removed.
(12) Remove adapter from the No.l spark plug
hole.
(18) Install rocker arms.
(14) Install covers and coil wire to distributor.
(15) Install air cleaner.
(16) Road test vehicle.
CYLINDER HEADS
The alloy cast iron- cylinder heads (Fig. 8) are held
in place by 10 bolts. The spark plugs are located in
the peak of the wedge between the valves.
The 5.2L cylinder head is identified by the foundry
mark NH.
EXHAUST SPARK EXHAUST SPARK
EXHAUST
VALVE PLUGS VALVES PLUGS VALVE
INTAKE INTAKE
VALVES VALVES
J9309-37
Fig. 8 Cylinder Head Assembly
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Drain cooling system (refer to Group 7, Cooling
System for the proper procedures).
(3) Remove the intake manifold-to-generator
bracket support rod. Remove the generator.
(4) Remove closed crankcase ventilation system.
(5) Disconnect the evaporation control system.
(6) Remove the air cleaner.
(7) Perform the Fuel System Pressure Release pro­
cedure (refer to Group 14, Fuel System). Disconnect
the fuel lines.
(8) Disconnect accelerator linkage and if so
equipped, the speed control and transmission kick-
down cables.
(9) Remove the return spring.
(10) Remove distributor cap and wires.
(11) Disconnect the coil wires.
(12) Disconnect heat indicator sending unit wire.
(13) Disconnect heater hoses and bypass hose.
(14) Remove cylinder head covers and gaskets.
(15) Remove intake manifold and throttle body as
an assembly. Discard the flange side gaskets and the
front and rear cross-over gaskets.
(16) Remove exhaust manifolds.
(17) Remove rocker arm assemblies and push rods.
Identify to ensure installation in original locations.
(18) Remove the head bolts from each cylinder
head and remove cylinder heads. Discard the cylin­
der head, gasket.
(19) Remove spark plugs.
GLEAMING
Clean all surfaces of cylinder block and cylinder
heads.
Clean cylinder block front and rear gasket surfaces
using a suitable solvent.
INSPECTION
Inspect all surfaces with a straightedge if there is
any reason to suspect leakage. If out-of-flatness ex­
ceeds 0.00075 mm/mm (0.00075 inch/inch) times the
span length in inches in any direction, either replace
head or lightly machine the head surface.
FOR EXAMPLE: A 305 mm (12 inch) span is
0.102 mm (0.004 inch) out-of-flat. The allowable out-
of-flat is 305 x 0.00075 (12 x 0.00075) equals 0.23
mm (0.009 inch). This amount of out-of-flat is accept­
able.
The cylinder head surface finish should be
1.78-3.00 microns (70-125 microinches).
Inspect push rods. Replace worn or bent rods.
INSTALLATION
(1) Position the new cylinder head gaskets onto the
cylinder block.
(2) - Position * the cylinder heads onto head gaskets
and cylinder block.
(3) Starting at top center, tighten all cylinder head
bolts, in sequence, to 68 N-m (50 ft. lbs.) torque (Fig.
4). Repeat procedure, tighten all cylinder head bolts
to 143 N-m (105 ft. lbs.) torque. Repeat procedure to
confirm that all bolts are at 143 N-m (105 ft. lbs.)
torque.
CAUTION: When tightening the rocker arm bolts,
make sure the piston in that cylinder is NOT at
TDC, Contact between the valves and piston could
occur.
(5) Install push rods and rocker arm assemblies in
their original position. Tighten the bolts to 28 N-m
(21 ft. lbs.) torque.
(6) Install the intake manifold and throttle body
assembly (refer to Group 11, Exhaust System and In­
take Manifold).
(7) Install exhaust manifolds. Tighten the bolts
and nuts to 34 N-m (25 ft. lbs.) torque.