Cadillac 60 Series 1963 Shop Manual page 206

ENGINE MECHANICAL
9-13
7. Loosen four cap screws that hold rocker arm
assembly to cylinder head and remove rocker arm
assembly with screws attached.
NOTE: If working on right side of car equip-
ped with Air Conditioner, remove the mounting
screws that hold Air Conditioner blower motor
and inlet assembly to cowl, and position as-
sembly away from engine so that right rocker
arm assembly can be removed without any
interference.
8. If in doubt as to which valve stem O-ring
seal is leaking, place a 1 inch diameter suction
cup above each inlet and exhaust valve spring re-
tainer in turn, Fig. 9-14.
9. Compress suction cup to create a vacuum
that will secure cup to top of valve spring re-
tainer. If suction cup will not stick, a leaking
stem seal is indicated, because air is entering
the area below suction cup.
10. Remove spark plug at affected cylinder, in-
stall Adapter, J-9388 in spark plug port, and fill
cylinder with air to hold valve up and seated when
spring is being compressed, as shown in Fig.
9-15.
CAUTION: Keep hands away from fan blade
until air pressure is established within the cy-
linder because, when air is applied, the crank-
shaft will turn quickly until the piston reaches
bottom dead center position.
11. Reinstall rocker arm cap screw nearest to
affected valve, position end of Valve Spring Com-
pressor, J-5892-1, under head of cap screw, and
Suction Cup
Retainer
'O" Ring
Valve
Locks
depress valve spring and retainer as shown in
Fig. 9-15.
NOTE: If No. 8 cylinder intake or exhaust
valve springs or O-ring seals need replacing on
cars equipped with Air Conditioner, remove Air
Conditioner blower motor and inlet assembly as
described in Section 13, Note 53a.
12. Remove valve lock and O-ring seal.
13. If valve spring requires replacement, care-
fully release tension on spring and remove Valve
Spring Compressor. Remove spring retainer and
spring.
b. Installation
1. Install a new O-ring seal on valve stem and
install spring and spring retainer.
2. Slide Thimble, J-3064-12, over valve stem,
seating tapered portion in valve lock portion of
spring retainer.
3. Compress spring, remove thimble tool, and
install valve lock.
4. Remove rocker arm cap screw used to po-
sition end of Valve Spring Compressor, J-5892-1.
Exhaust air from cylinder, remove Adapter,
J-9388, and install previously removed spark
plug.
Valve Spring
Compressor
J-5892-1
Fig. 9-14 Checking O-Ring Seal for Leak
Fig. 9-15 Depressing Valve Spring