Dodge Viper SRT-10 (ZB). Manual — part 173
(4) Remove cylinder head cover from engine (Fig.
37).
INSTALLATION
LEFT CYLINDER HEAD COVER
NOTE: Care must be taken to protect the cylinder
head covers powder coating from scrapes and
abrasions.
(1) Inspect cylinder head cover gasket. Replace as
necessary.
(2) Place cylinder head cover onto cylinder head
(Fig. 37). Install and tighten cylinder head cover fas-
teners to 11 N·m (95 in. lbs.) in sequence shown in
(Fig. 38).
(3) Position the oil level indicator tube into posi-
tion. Tighten fastener to 11 N·m (95 in. lbs.).
(4) Connect spark plug wires. Position spark plug
wire retainers onto cylinder head cover studs.
(5) Connect CCV hose to cylinder head cover.
(6) Connect the power brake booster vacuum hose
to the intake manifold port.
RIGHT CYLINDER HEAD COVER
(1) Inspect cylinder head cover gasket. Replace as
necessary.
(2) Place cylinder head cover onto cylinder head
(Fig. 37).
(3) Connect spark plug wires. Position spark plug
wire retainers onto cylinder head cover studs.
(4) Connect CCV hose to cylinder head cover.
ROCKER ARMS
REMOVAL
NOTE: Before replacing parts, inspect all related
valvetrain
components
for
damage
to
prevent
engine misfire.
(1) Remove cylinder head cover(s) (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - REMOVAL).
(2) Remove two rocker pedestal bolts per each cyl-
inder (Fig. 33).
(3) Remove rocker arm assemblies as a pair (Fig.
33).
Fig. 37 Cylinder Head Covers
1 - RIGHT CYLINDER HEAD COVER
2 - LEFT CYLINDER HEAD COVER
Fig. 38 Cylinder Head Cover Tightening Sequence
Fig. 39 ROCKER ARMS - 8.3L
1 - ROCKER ARM ASSEMBLY
2 - CYLINDER HEAD
9 - 34
ENGINE
ZB
CYLINDER HEAD COVER(S) (Continued)
(4) If rocker arm assemblies are disassembled for
cleaning or replacement, reassemble rocker arms in
their original position.
INSTALLATION
NOTE: Before replacing parts, inspect all related
valvetrain
components
for
damage
to
prevent
engine misfire.
(1) Install rocker arm and pedestal assemblies into
position. Ensure push rods are seated properly under
each rocker arm. Tighten rocker arm bolts to 35 N·m
(26 ft. lbs.) (Fig. 33).
CAUTION: THE ROCKER ARM PEDESTAL BOLTS
SHOULD BE TORQUED DOWN SLOWLY. ALLOW 20
MINUTES TAPPET BLEED DOWN TIME AFTER
INSTALLATION OF THE ROCKER BOLTS BEFORE
ENGINE OPERATION.
(2) Install cylinder head cover(s) (Refer to 9 -
ENGINE/CYLINDER
HEAD/CYLINDER
HEAD
COVER(S) - INSTALLATION).
VALVE SPRINGS/SEALS
DESCRIPTION
The valve spring is of cylindrical design made out
of ovate wire with an internal flat ribbon damper.
The valve spring is wound downward and to the
right while the damper is wound downward and to
the left. The valve spring is serviced as an assembly
along with a new seat and retainer (Fig. 41).
DIAGNOSIS AND TESTING
VALVE SPRING TESTING
The valve springs should be tested whenever
removed for inspection, reconditioning, or replace-
ment (Fig. 42).
Fig. 40 ROCKER ARMS - 8.3L
1 - ROCKER ARM ASSEMBLY
2 - CYLINDER HEAD
Fig. 41 VALVE SPRING AND RETAINERS
1 - VALVE SPRING
2 - VALVE RETAINER
3 - VALVE SEAT
Fig. 42 Valve Spring Testing with Special Tool C-647
1 - TORQUE WRENCH
2 - VALVE SPRING TESTER
ZB
ENGINE
9 - 35
ROCKER ARMS (Continued)
(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)
REMOVAL
NOTE: Before replacing parts, inspect all related
valvetrain
components
for
damage
to
prevent
engine misfire.
(1) With the cylinder head removed, compress
valve springs using a valve spring compressor (1)
(Fig. 44).
(2) Remove valve retaining locks (Fig. 45).
(3) Slowly release valve spring compressor.
(4) Remove valve spring retainer and valve spring
(Fig. 45).
(5) Before removing the valves, remove any
burrs from valve stem lock grooves to prevent
damage to the valve guides. Identify the valves to
ensure installation in original location.
(6) Remove valve seal (Fig. 45).
(7) Repeat procedure for remaining valves.
INSTALLATION
NOTE: Before replacing parts, inspect all related
valvetrain
components
for
damage
to
prevent
engine misfire.
NOTE: Black valve seals are intake. Brown valve
seals are exhaust (Fig. 45).
(1) Install valve seals (1) (Fig. 45).
(2) Coat the valve stems with clean engine oil and
insert them in the cylinder head.
(3) Install valve spring seats (Fig. 45)(6).
(4) Install valve springs and valve retainers (Fig.
45)(2).
Fig. 44 Valve Spring Removal
1 - VALVE SPRING COMPRESSOR
Fig. 45 Valves / Springs / Seals
1 - EXHAUST VALVE SEAL (BROWN)
2 - VALVE RETAINING LOCKS
3 - VALVE SPRING RETAINER
4 - VALVE SPRING
5 - INTAKE VALVE SEAL (BLACK)
6 - VALVE SPRING SEAT
7 - INTAKE VALVE
8 - EXHAUST VALVE
Fig. 46 Valves / Springs / Seals
1 - EXHAUST VALVE SEAL (BROWN)
2 - VALVE RETAINING LOCKS
3 - VALVE SPRING RETAINER
4 - VALVE SPRING
5 - INTAKE VALVE SEAL (BLACK)
6 - VALVE SPRING SEAT
7 - INTAKE VALVE
8 - EXHAUST VALVE
ZB
ENGINE
9 - 37
VALVE SPRINGS/SEALS (Continued)
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