Cadillac 60 Series 1963 Shop Manual page 208

ENGINE MECHANICAL
9-15
Valve seats should be cut so that the seat is
1/16 inch smaller in diameter than the valve head,
Fig. 9-16, to allow heat to escape and to provide
maximum life for newly ground valves. The di-
ameter of the seat can be checked by placing
valve in position and then rotating to get a contact
pattern with the seat.
New valves have a face angle of 44° to provide
a line contact between the head of the valve and
the valve seat in the cylinder head, which assures
good seating of the valve and less chance of
burning the valve head due to exhaust gas leak-
age. When reconditioning valves, always grind
valve face angle to 44°. Whenever valves are
ground, the rocker arms should be refaced.
New valves should not have more than 1/64 inch
wide contact with valve seats (due to 1° difference
in angle). Grinding of valves by hand with grind-
ing compound or lapping to seat them is not
recommended. Use only precision equipment for
valve and seat reconditioning, and follow equip-
ment manufacturer's instructions.
11. Cylinder Head Assembly
a. Installation of Valve Guides
If any valve guides were removed, new ones
should be installed as follows:
1. Position Valve Stem Guide Driver, J-3066-2,
through Gaging Block, J-6535, Fig. 9-17.
2. Slide valve guide on installer pilot and lubri-
cate outer surface of guide.
CAUTION: Be sure end of valve guide with
longest chamfer enters bore first, pointing
toward rocker arm side of head.
3. Drive guide into cylinder head until shoulder
on installer contacts plate on cylinder head.
Flat side of valve guide plate rests on cylinder
head, while notched portion, which acts as a stop
for driving tool, is toward top.
b. Installation of Valves
1. Install all valves in their respective guides
and install Holding Strap, J-3064, over valve
heads to hold them in place while installing
springs. Coat valve stems liberally with a good
grade of engine oil.
2. Place cylinder head in Holding Fixture, right
side up.
3. Place spring over valve, being sure bottom
of spring is in recess in cylinder head. End of
spring with closely wound coils should be placed
against cylinder head.
4. Place spring retainer over valve and spring.
5. Plaie Thimble, J-3064-12, over valve stem
with tapered portion seated in valve spring
retainer.
6. Using Foot Stirrup, compress valve spring
and then remove Thimble.
7.
valve
is prope:
stem
Install new rubber seal in lower groove in
(closest to valve head), being sure seal
ly seated.
8. Install valve keepers in position and release
tension on foot stirrup.
9. Chepk to see that oil seal has been installed
properly:
First
keepers,
retainer
the seal.
:ap ends of valve stems to seat valve
then compress a suction cup over spring
and valve stem to test for leaking past
If oil s sal is installed properly, vacuum cup will
stick to spring retainer.
If there is no suction, seal is leaking, and parts
must be disassembled and a new seal installed.
12. Rocker Arm Assembly-
Disassembly and Assembly
(Fig. 9-18)
a. Disassembly
1. Remove four mounting cap screws.
Valve Stem
Guide Driver
Tool No. J-3066-2
•-:% v
Gaging Block
Tool No. J-6535 *
#
^i!\ssr ^
Fig. 9-17 Valve Guide Installation