Ford COUGAR 1968 Shop Manual page 389

PART 8-4
-
390 And 427 V-8
8- 105
(if so equipped) on the right exhaust
manifold; then connect the exhaust
manifold(s) to the muffler inlet pipe(s).
Torque the nuts to specifications.
On the 427 V-8, use new gasket(s)
and position the exhaust manifold(s)
FIG.
31-Cylinder H e a d Bolt
Torque Sequence
to the cylinder head(s). Install and
torque the retaining bolts to specifi-
cations.
8. Install the baffle plate. Install
the intake manifold and related parts
following the procedure under Intake
Manifold Installation. I f equipped
with Thermactor exhaust emission
control system, connect the air hoses.
DISASSEMBLY
1. Remove the Thermactor ex-
haust emission control system com-
ponents. On all engines except the
427 V-8, remove the exhaust mani-
fold(~).
2.
Taking special care not to
damage the exposed machined sur-
faces. remove the spark plugs. Clean
the carbon out of the cylinder head
combustion chambers before remov-
ing the valves.
3. Compress the valve springs
(Fig. 32). Remove the spring retain-
er locks and release the spring.
Inspect the valve springs before
removal t o determine if the damper
spring(s) is intertwined with the
valve spring(s). If this condition
exists, replace all defective or worn
components (refer to inspection pro-
cedures in Part 8-1, Section 3).
4. Remove the sleeve, spring re-
tainer, spring (and damper spring if
applicable), stem seal and valve.
Discard the valve stem seals. Iden-
tify all valve parts.
5 . Clean, inspect, and repair all
parts following the procedures in Part
8-1, Sections 2 and 3.
ASSEMBLY
1. Install each valve (Fig. 33) in
the port from which it .was removed
or to which it was fitted. Install
a
new stem seal on the valve. The ex-
haust valve stem seal is approximate-
ly 0.025 inch shorter in over-all
height than the intake valve stem
seal (identified with yellow paint);
therefore, be sure the seals are in-
stalled on the proper valves.
2. Install the valve spring (closed
coils downward) over the valve, and
@
+LOCKS
SLEEVE
6518
SPRING RETAINER,
VALVE
6514
SPRING
DAMPER
65!3 SPRING
OIL SEAL
6 5 7 428 POLICE
INTERCEPTOR
INTAKE VALVE
ENGINES ONLY
6507
EXHAUST VALVE
6505
A1427-F
FIG.
32-Compressing Valve
Spring-On Bench
FIG.
33-Typical Valve Assembly
install the spring retainer and sleeve.
Make sure the damper spring is in-
stalled in the valve spring so that
the coil end of the damper spring is
135 degrees counterclockwise from
the coil end of the valve spring.
3.
Compress the spring and install
the retainer locks (Fig. 32).
4. Measure the assembled height
of the valve spring from the surface
of the cylinder head spring pad to
the underside of the spring retainer
with dividers (Fig. 34). Check the
dividers against a scale. If the as-
sembled height is greater than speci-
fied, install the necessary 0.030-inch
thick spacer(s) between the cylinder
head spring pad and the valve springs
(Fig. 35) to bring the assembled
height to the recommended specifi-
cations.
Do not install spacers unless nec-
essary. Use of spacers in excess of
:
recommendations will result in over-
stressing the valve springs and over-
loading the camshaft lobes which
could lead to spring breakage and
worn camshaft lobes.
5.
On the 390 V-8, install the ex-
haust manifold(s).
6. Install the spark plugs.
Install the Thermactor components.
VALVE- SPRING, RETAINER
AND STEM SEAL
REPLACEMENT
Broken valve springs, or defective
valve stem seals and retainers may
be replaced without removing the
cylinder head provided damage to the
valve or valve seat has not occurred.
1.
Remove the valve rocker arm
cover(s) and rocker arm shaft assem-
blies following the procedures under
Valve Rocker Arm Shaft Assembly
Removal.
2. Remove both push rods of the
cylinder to be serviced.
3.
Tighten the valve rocker arm
support bolts evenly and alternately,
two turns at a time, until they are
h u g . Push the rocker arm to one
side and secure it in this position
(Fig. 36). If an end valve is to be
worked on, it will be necessary to
remove the rocker arm from the
shaft.
4. Remove the applicable spark
plug. Install an air adapter in the
spark plug hole and connect the air
supply hose to the adapter (Fig. 37).
Turn on the air supply. Air pres-
sure may turn the crankshaft until