Cadillac 60 Series 1963 Shop Manual page 207

9-14
ENGINE MECHANICAL
5. Install rocker arm assembly with attaching
screws on cylinder heads, making sure rocker
arm sockets are seated over tops of push rods,
and bottoms of push rods are seated in their lifter
cups. Tighten screws to 75 foot-pounds.
CAUTION: Be sure oil grooves in rocker
arm shaft face downward, arid oil holes in shaft
face toward center of engine.
6. Install rocker arm cover on cylinder head,
using new gasket, and secure with four attaching
screws. Tighten screws to 28 inch-pounds.
7. If work was performed on left side of car,
install engine oil dipstick. On car equipped with
Cruise Control, connect accelerator linkage rod at
control unit.
8. If the Air Conditioner blower motor and inlet
assembly was removed, install assembly as des-
cribed in Section 13, Note 53b.
9. If work was performed on right side of car,
install water control valve on retainer bracket and
secure with spring clip. Secure front heater inlet
hose to retainer clamp on rocker arm cover.
10. If work was performed on right side of car
equipped with Air Conditioner, install compressor
as described in Section 13, Note 29b.
11. Connect spark plug wires at plugs.
12. Install carburetor air cleaner.
13. Connect positive battery cable.
14. Operate engine to obtain operating temper-
Valve Head
JL 1/32" I 1/32"-—
^Valve^
^ S e a t ^
Fig. 9-16 Valve Seat Diameter
ature and re-torque rocker arm cover screws to
28 inch-pounds.
10. Valve and Seat Reconditioning
Valve reconditioning is normally required less
frequently in engines having hydraulic valve
lifters. When this work is done, the close limits
given in the engine specifications, Page 9-38,
must be maintained.
Check valve stem to guide clearance using a
hole gage and an outside micrometer. Measure
valve guide inside diameter with hole gage, cross-
ways to engine, at both top and bottom of guide,
measuring gage each time with micrometer.
Measure valve stem diameter with micrometer
and subtract from greater of two guide measure-
ments to obtain maximum clearance. If clearance
is greater than .005 inch, guide should be replaced
to prevent excessive oil consumption and im-
proper seating of valves.
After new valve guide has been installed, re-
check valve stem to guide clearance. If clearance
is still greater than .005 inch, replace the valve.
An alternate method of checking valve stem to
guide clearance if a hole gage is not available, is
by using a 1/16 inch wide strip of .005 inch brass
shim stock on a "no-go" basis.
Bend end of shim and hang in end of valve guide,
with tip extending towards push rod side of head.
Shim should not extend more than 1/4 inch into
guide. If valve stem will enter guide, clearance is
excessive and guide should be replaced.
Check concentricity of all valve seats. This
should be within .004 inch total, as measured with
dial indicator and a solid, slightly tapered pilot
which has a slight bind in the valve guide when
installed.
CAUTION: A pilot of the correct size must
be used. Do not attempt to drive pilot into guide.
Pilots with adjustable diameters to fit various
sized guides are not recommended.
Grind valves to within .002 inch indicator read-
ing when new valves and guides are being in-
stalled, or if concentricity, seat width, or full
contact of valves is not as specified.
Check seat width and location on valve to insure
proper heat dissipation and prevent buildup of
carbon on seats. The desirable seat width depends
upon conditions of operation. Cars operated at
moderate or slow speeds in city driving should
have a valve seat width of 3/64 inch to 1/16 inch.
For cars driven mostly at high speeds, the seat
width should be 1/16 inch to 3/32 inch to assure
adequate cooling.