Cylinder Head Assembly - Chevrolet 10 1971 Series Chassis Service Manual

ENGINE 6-30
b. In rare cases, the ball itself may be out-of-round
or have a flat spot.
c. Improper adjustment.
In most cases where noise exists in one or more lifters
all lifter units should be removed, disassembled, cleaned
in a solvent, reassembled, and reinstalled in the engine.
If dirt, corrosion, carbon, etc. is shown to exist in one
unit, it more likely exists in all the units, thus it would
only be a matter of time before all lifters caused trouble.
Removal
1. Remove intake manifold as outlined.
2. Remove valve mechanism as outlined.
3. Remove valve lifters.
Place valve lifters in a rack so they
NOTE:
may be reinstalled in the same location.
Installation
1. Install valve lifters.
Whenever new valve lifters are being
NOTE:
installed, polish lifter first with #600 wet/dry
emery paper and coat foot of valve lifters with
" Molykote" or its equivalent.
2. Install intake manifold as outlined.
3. Install and adjust valve mechanism as outlined.
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. Install air line adapter Tool J-23590 to spark plug
port and apply compressed air to hold the valves in
place.
4. Using Tool J-5892 to compress the valve spring,
remove the valve locks, valve cap and valve spring
and damper (fig. 3V).
5. Remove the valve stem oil seal.
Fig. 2 V -V a lv e Adjustment
6. Assemble as follows:
Small V8 Engines
a. Set the valve spring and damper, valve shield and
valve cap in place. Compress the spring with Tool
J-5892 and install oil seal in the lower groove of
the stem, making sure the seal is flat and not
twisted.
A light coat of oil on the seal will help
NOTE:
prevent twisting.
b. Install the valve locks and release the com­
pressor tool making sure the locks seat properly
in the upper groove of the valve stem.
Grease may be used to hold the locks in
NOTE:
place while releasing the compressor tool.
Mark IV V8 Engines
a., Install new valve stem oil seal (coated with oil)
in position over valve guide.
b. Set the valve spring and damper and valve cap
in place.
c. Compress the spring with Tool J-5892 and install
the valve locks then release the compressor tool,
making sure the locks seat properly in the groove
of the valve stem.
Grease may be used to hold the locks
NOTE:
in place while releasing the compressor tool.
7. Install spark plug and torque to specifications.
8. Install and adjust valve mechanism as outlined.

Cylinder Head Assembly

Removal
1. Remove intake manifold as outlined.
Fig. 3V — Compressing V a lve Spring
10-30 CHEVROLET TRUCK SERVICE MANUAL