ENGINE 6-16
5.
Adjust ignition timing and carburetor idle speed and
mixture.
VALVE STEM OIL SEAL AND/OR VALVE SPRING
Replacement
1.
Remove rocker arm cover as outlined.
2.
Remove spark plug, rocker arm and push rod on the
cylinder(s) to be serviced.
3.
Apply compressed air to the spark plug hole to hold
the valves in place.
NOTE: A tool to apply air to the cylinder is
available through local jobbers or may be manu-
factured. In manufacturing this Tool a AC-46N
Spark Plug or its equivalent is recommended.
This will make the Tool universal for all
Chevrolet engines. Chisel the spark plug as
shown, then drive the porcelain out of the plug
by tapping the center electrode against a hard
block. Using a 3/8" pipe tap, cut threads in the
remaining portion of the spark ^>lug and assem-
ble as shown (fig. 3L).
4.
Using Tool J-5892 to compress the valve spring, re-
move the valve locks, valve cap, valve shield and
valve spring and damper (fig. 4L).
5.
Remove the valve stem oil seal.
6. To replace, set the valve spring and damper, valve
shield and valve cap in place. The close coiled end
of the spring is installed against the cylinder head.
Compress the spring with
Too^
J-5892 and install oil
seal in the lower groove of the stem, making sure the
seal'is flat and not twisted.
NOTE: A light coat of oil on the seal will help
prevent twisting.
7.
Install the valve locks and release the compressor
tool, making sure the locks seat properly in the
upper groove of the valve stem.
NOTE: Grease may be used to hold the locks
in place while releasing the compressor tool.
8. Install spark plug, using a new gasket, and torque to
specifications.
9. Install and adjust valve mechanism as outlined.
CYLINDER HEAD ASSEMBLY
Removal
1.
Remove manifold assembly as. outlined.
2.
Remove valve mechanism as outlined.
3.
Drain cooling system (block).
4.
Remove fuel and vacuum line from retaining clip at
water outlet then disconnect wires from temperature
sending units.
5.
Disconnect upper radiator hose at water outlet hous-
ing and battery ground strap at cylinder head.
6. Remove coil (L6 engines only).
7.
Remove cylinder head bolts, cylinder head and gas-
ket. Place cylinder head on two blocks of wood to
prevent damage.
Installation
CAUTION: The gasket surfaces on both the
head and the block must be clean of any foreign
matter and free of nicks or heavy scratches.
Cylinder bolt threads in the block and threads
on the cylinder head bolt must be cleaned. (Dirt
will affect bolt torque.) Do not use gasket sealer
on composition steel asbestos gasket.
Fig. 3L -
AIF
Adapter Tool
1.
Place the gasket in position over the dowel pins with
the bead up.
2.
Carefully guide cylinder head into place over dowel
pins and gasket.
3.
Coat threads of cylinder head bolts with sealing com-
pound and install finger tight.
4.
Tighten cylinder head bolts a little at a time in the
sequence shown on the torque sequence chart until
the specified torque is reached.
5.
Install coil (if removed).
6. Connect upper radiator hose and engine ground strap.
7.
Connect temperature sending unit wires and install
fuel and vacuum lines in clip at water outlet.
8. Fill cooling system.
•
9. Install manifold assembly as outlined.
10.
Install and adjust valve mechanism as outlined.
Fig.
4L
- Compressing Valve Spring
CHEVROLET CHASSIS SERVICE MANUAL
