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CS
VALVE SPRINGS (Continued)
Fig. 65 Checking Valve Tip Height and Valve Spring
Installed Height
1 - SPRING RETAINER
2 - GARTER SPRING
3 - VALVE SPRING SEAT TOP
4 - CYLINDER HEAD SURFACE
VALVE SPRINGS
DESCRIPTION
The valve springs are made from chrome silicon
alloy wire and incorporate a "bee-hive" design. Valve
spring retainers and locks are common from valve-to-
valve. The valve spring seat is integral with the
valve stem oil seal, which incorporates a garter
spring to maintain consistent lubrication control to
the valve stem.
The valve springs are unique for intake compared
to exhaust. Both have different lengths and are
wound in opposite directions. The valve springs are
color coded, intake spring is right hand coil direction
with orange dye on the top coils, and the exhaust
spring is left hand coil direction with a yellow or
white dye on the top coils (Fig. 66).
The exhaust spring with the white dye on the top
of the coils has an increased open and closed load
when compared to the exhaust spring with the yellow
dye. A yellow and a white exhaust valve spring
should never be used on a single forked rocker arm.
Color coated exhaust springs should always be used
in pairs for a forked exhaust rocker springs.
OPERATION
The valve spring returns the valve against its seat
for a positive seal of the combustion chamber.
Fig. 66 Valve Spring Identification
1 - YELLOW OR WHITE DYE
2 - ORANGE DYE
REMOVAL
REMOVAL - CYLINDER HEAD OFF
(1) Compress valve spring with valve spring com-
pressor C-3422-D and adapter 6526 (Refer to 9 -
ENGINE - SPECIAL TOOLS).
(2) Remove valve retaining locks. Release valve
spring compressor. Remove valve spring retainer and
valve spring.
(3) Remove valve stem seal assembly. (Refer to 9 -
ENGINE/CYLINDER HEAD/VALVE STEM SEALS -
REMOVAL)
REMOVAL - CYLINDER HEAD ON
(1) Disconnect negative battery cable.
(2) Remove upper intake manifold (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
REMOVAL).
(3) Remove cylinder head cover(s) (Refer to 9 -
ENGINE/CYLINDER
COVER(S) - REMOVAL).
(4) Remove rocker arm and shaft assembly (Refer
to 9 - ENGINE/CYLINDER HEAD/ROCKER ARM /
ADJUSTER ASSY - REMOVAL).
(5) Remove spark plugs.
(6) Rotate the crankshaft clockwise, until the num-
ber 1 piston is at TDC (Top Dead Center) on the com-
pression stroke.
(7) With air hose attached to spark plug adapter
installed in number 1 spark plug hole, apply 620.5 to
689 kPa (90 to 100 psi) air pressure. This is to hold
valves into place while servicing components.
(8) Using Tool MD 998772A with adapter 6527 or
equivalent, compress valve spring and remove valve
locks. Release tension on valve spring, remove
retainer and valve spring (Refer to 9 - ENGINE -
SPECIAL TOOLS) (Fig. 67).
(9) Remove valve stem seal, if required. (Refer to 9
- ENGINE/CYLINDER HEAD/VALVE STEM SEALS
- REMOVAL)
ENGINE 9 - 51
MANIFOLD
HEAD/CYLINDER
-
HEAD
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