Chevrolet Corvette 1963 Repair & Tune-Up Manual page 116

same design and arrangement as the small-
block type.
REMOVAL
NOTE: The following Removal and Instal-
lation procedures apply to cylinder heads
installed on the vehicle. Access to an air
compressor and the purchase of certain
special tools is required.
1. Remove the valve cover (both of the
covers if all of the springs and/or seals are to
be replaced).
2. Remove the spark plug from the cylin
der which is to be serviced.
3. Install an air line adaptor in place of the
spark plug and attach the air line from the air
compressor to die adaptor. The compressed
air is used to hold the valves in place when
the valve springs are compressed. If either of
the valves of the cylinder to be serviced are
open, attach the air line after step 4.
4. Remove the rocker arm, ball and push-
rod of the valve to be serviced.
5. Install a special valve spring compress
ing tool to the rocker arm stud and retain the
tool with the rocker arm nut.
6. Lever the tool handle towards you to
compress the spring. Remove the two valve
locks (split keys) and release the pressure on
the tool handle slowly. Remove the tool, valve
spring, and related components.
NOTE: If the valve does not stay in its up-
permost position as the spring is com-
pressed, the valve and/or valve seat are
probably burned. A burned valve or seat
will allow the compressed air to leak out of
the cylinder. Cylinder head should be re-
moved and overhauled.
SPRING
COMPRESSING •
TOOL
Replacing the valve seals using compressed air and
a special valve spring compressing tool—small
block shown, big block similar
ENGINE AND ENGINE REBUILDING
INTAKE VALVE DETAIL
O-ring type valve seal placement. Note the optional
seal types are shown as dotted lines.
INSTALLATION
1. If a rubber "umbrella" type seal is used
(big-block only), install the seal over the valve
stem and seat it onto the valve guide boss.
2. Install the valve spring(s) and retainer
over the valve and install the valve compress
ing tool. Compress the spring enough to ex
pose the grooves of the valve stem.
NOTE: On big-block models using the ny-
lon seal, the seal must be attached to the
retainer prior to installation.
3. If O-ring type seals are used, position
the O-ring into the lower groove of the valve
stem, install the locks (retain with grease), and
release the spring compressing tool. If the in
tegral nylon seals are used, merely install the
locks and release the spring compressing tool.
4. Visually check that the locks are posi
tioned properly in the retainer.
5. Install the pushrod, rocker arm, and pi
vot ball. Tighten the rocker arm nut until it
seems to be positioned the same as an undis
turbed rocker nut.
6. Disconnect the compressed air line, re
move the air line adaptor, and reinstall and
connect the spark plug.
7. Adjust the valve as previously outlined
and reinstall the valve cover(s).
Valve Lifters
NOTE: Hydraulic valve lifters very seldom
require attention. The lifters are extremely
simple in design, readjustments are not
necessary, and servicing of the lifters re-
quires only that care and cleanliness be ex-
ercised in the handling of parts.
REMOVAL AND INSTALLATION
1. Remove intake manifold as previously
outlined.
109
EXHAUST VALVE DETAIL