Cylinder Head - Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual

6A 1 -1 4 IN-LINE 6
Fig. 6 A 1-1 4— Installin g Ball Check Valve
Assembly
1. Place the check ball on small hole in bottom of the
plunger.
2. Insert check ball spring on seat in ball retainer and
place retainer over ball so that spring rests on the ball.
Carefully press the retainer into position in plunger with the
blade of a small screw driver (fig. 6A1-14).
3. Place the plunger spring over the ball retainer and
slide the lifter body over the spring and plunger, being
careful to line up the oil feed holes in the lifter body and
plunger.
4. Fill the assembly with SAE 10 oil, then insert the
end of a 1/8" (3mm) drift pin into the plunger and press
down solid. At this point oil holes in the lifter body and
DRIFT PIN
O IL FEED H O LE
Fig. 6A1-1 5--Assembling Hydraulic Lifter
LIG H T TRU CK SER V ICE MANUAL
plunger assembly will be aligned (fig. 6A1-15).
CAUTION: Do not attempt to force or
pump the plunger.
5. Insert a 1/16" (1.6mm) drift pin through both oil
holes to hold the plunger down against the lifter spring
tension (fig. 6A1-15).
. Remove the 1/8" (3mm) drift pin, refill assembly
6
with SAE 10 oil.
7. Install the metering valve and push rod seat (refer
to fig. 6A1-12).
8 . Install the push rod seat retainer, press down on the
push rod seat and remove the 1/16" (
the oil holes. The lifter is now completely assembled, filled
with oil and ready for installation.
NOTICE: Before installing lifters, coat the bottom of
the lifter with "Molykote" or its equivalent.
Installation
1. Install valve lifters.
Whenever new valve lifters are being
NOTICE:
installed, coat foot of valve lifters with "Molykote" or
its equivalent. Make sure the lifter foot is convex.
2. Install push rod covers, using RTV, and torque bolts
to specifications.
NOTICE: Make sure that covers are not bent.
(Straighten, if necessary) Use a 1/8" (3mm) bead of
RTV, #1052366 or equivalent, on the covers, in the
groove matching the block cavities.
3. Install distributor, positioning rotor to #1 cylinder
position, then connect primary lead at distributor.
4. Install push rods and adjust valve mechanism as
outlined.
5. Adjust ignition timing and carburetor idle speed.
CYLINDER HEAD ASSEMBLY
Removal
1. Remove manifold assembly as previosuly outlined.
2. Remove rocker arm cover and valve mechanism as
previously outlined.
3. Drain cooling system.
4. Remove fuel and vacuum line from retaining clip at
coolant outlet, then disconnect wires from temperature
sending units.
5. Disconnect air injection hose at check valve (if so
equipped).
6 . Disconnect radiator upper hose at coolant outlet
housing and battery ground strap.
7. Remove cylinder head bolts, cylinder head and
gasket. Place cylinder head on two blocks of wood to
prevent damage.
Disassembly
1. With the cylinder head removed, use tool J-8062 to
compress the valve springs and remove the valve keys.
Release the compressor tool and remove rotators or spring
1 . 6 mm) drift pin from