Dodge ZB 2005, Service Manual

Page: 697 / 1873

(1) Obtain specifications for spring tension at spec-
ified spring length (Refer to 9 - ENGINE - SPECIFI-
CATIONS).
(2) Turn table of Special Tool C-647 (2) until the
surface is in line with the spring length specification
mark on the threaded stud and the zero mark is on
the front.
(3) Place spring over stud on the table and lift
compressing lever to set tone device.
(4) Pull on torque wrench (beam or dial type) until
ping is heard. Take reading on torque wrench at this
instant. Multiply this reading by two. This will give
the spring load at test length.
(5) Compare reading to the specification. Discard
the springs that do not meet specifications.
STANDARD PROCEDURE - VALVE SPRING/
SEAL SERVICE IN-CAR
(1) Disconnect negative battery cable.
(2) Disconnect
secondary ignition wires and
remove spark plugs.
(3) Remove cylinder head cover(s) (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - REMOVAL).
(4) Rotate crankshaft until No. 1 piston is at TDC
on compression stroke.
(5) Remove rocker arms with pivots. The rocker
arms should not be disturbed and remain on pivot
block.
(6) With air hose attached to spark plug adapter
installed in No. 1 spark plug hole, apply 620.5 - 689
kPa (90 - 100 psi) air pressure. This is to hold valves
into place while servicing components.
CAUTION: Place a suitable shop towel around the
valve spring being serviced to prevent the valve
retaining locks from entering the engine once the
valve spring is compressed.
(7) Using valve spring compressor MD998772-A
with insert 6716-A (1), compress valve spring (2) and
remove valve retaining locks (Fig. 43).
(8) Release valve spring compressor (1).
(9) Remove valve spring and retainer (Fig. 45).
(10) Remove valve seal (Fig. 45).
NOTE: Black valve seals are intake. Brown valve
seals are exhaust (Fig. 45).
(11) The intake and exhaust valve stem seals
should be pushed firmly and squarely over the valve
guide using the valve stem as guide. Push seal
against top of guide. When installing the valve
retainer locks, compress the spring only enough to
install the locks.
CAUTION: Do not pinch seal between retainer and
top of valve guide.
(12) Follow the same procedure on the remaining 9
cylinders. Make sure piston is at TDC on the cyl-
inder the valve spring is being removed.
(13) Remove spark plug adapter tool.
(14) Install rocker arm and pedestal assemblies.
Ensure push rods are seated properly under each
rocker arm. Tighten rocker arm bolts to 35 N·m (26
ft. lbs.).
(15) Install cylinder head covers (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
(16) Install spark plugs and connect secondary
ignition wires.
(17) Connect negative battery cable.
Fig. 43 IN-VEHICLE VALVE SPRING REMOVAL AND
INSTALLATION
1 - MD998772-A
2 - VALVE SPRING
3 - EXHAUST MANIFOLD HEAT SHIELD
4 - FUEL INJECTOR HARNESS CONNECTOR
5 - INTAKE MANIFOLD
9 - 36 ENGINE
ZB
VALVE SPRINGS/SEALS (Continued)