Chevrolet 1973 Overhaul Manual page 156

L O C K S \^ ^
" C A P -------
S E A L-------- W |
SHIELD
S P R IN G —► ^ y p
* DAM PER
* NOT USED ON 250 CU. IN. L6
Fig. 25 —Valve Spring In sta lla tio n (In-Line and
"S m a ll V 8 ")
c. Compress the spring with Tool J-8062.
d. Install the valve locks and release the compres­
sor tool, making sure the locks seat properly in
the groove of the valve stem.
NOTE: Grease may be used to hold the locks
in place, while releasing the compressor tool.
3. Install the remaining valves.
4. On In-Line and "Small V8" engines check each
valve stem oil seal by placing Valve Seal Leak
Detector (Tool J-23994) over the end of the valve
stem and against the cap. Operate the vacuum
pump and make sure no air leaks past the seal (fig.
27).
5. Check the installed height of the valve springs,
using a narrow thin scale. A cutaway scale will help
(fig. 28). Measure from the top of the shim or the
Fig. 2 7 —Checking Valve Stem Oil Seals
Fig. 26—Exhaust Valve Spring In sta lla tio n ( "M a rk IV
V 8 ")
spring seat to the top of the valve spring or valve
spring shield (fig. 29). If this is found to exceed the
specified height, install a valve spring seat shim
approximately 1/16" thick. At no time should the
spring be shimmed to give an installed height
under the minimum specified.
G R IN D OUT THIS P O R T IO N
| | I | - | , j M
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| M ' | 11' j 11'
1 1
' I ' H " I ' l ' l "
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Fig. 28 —Cutaway Scale
Fig. 2 9 —M easuring Valve Spring Installed Height
EN G IN E 6-15
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3 4 5
OVERHAUL MANUAL
6