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6A6-8
1977 PONTIAC SERVICE MANUAL
Fig. 6A6-9 Installing Ball Check Valve
4. Fill the assembly with SAE 10 oil, then insert the end
of a 1/8" drift pin into the plunger and press down solid. At
this point oil holes in the lifter body and plunger assembly
will be aligned (Fig. 6A6-10).
CAUTION: Do not attempt to force or pump the
plunger.
5. Insert a 1/16" drift pin through both oil holes to hold
the plunger down against the lifter spring tension (Fig. 6A6-
10).
6. Remove the 1/8" drift pin, refill assembly with SAE
10 oil.
7. Install the metering valve and push rod seat (Fig. 6A6-
7).
8. Install the push rod seat retainer, press down on the
push rod seat and remove the 1/16" drift pin from the oil
holes. The lifter is now completely assembled, filled with oil
and ready for installation.
NOTE: Before installing lifters, coat the bottom of the
lifter with "Molykote" or its equivalent.
CYLINDER HEAD ASSEMBLY
Removal
1. Remove intake manifold as previously outlined.
2. Remove generator lower mounting bolt and lay unit
aside.
3. Remove exhaust manifolds as previously outlined.
4. If vehicle is equipped with A/C, remove A/C
compressor and forward mounting bracket. Lay unit aside.
NOTE: On vehicles equipped with A.I.R., disconnect
the rubber hosing at the injection tubing check valve. In
this manner, the tubing will not have to be removed from
the exhaust manifold.
Fig. 6A6-10 Assembling Hydraulic Lifter
5. Remove valve mechanism as previously outlined.
6. Drain cylinder block of coolant.
7. Remove cylinder head bolts, cylinder head and gasket.
Place cylinder head on two blocks of wood to prevent
damage.
Disassembly
1. With cylinder head removed, remove valve rocker arm
nuts, balls and rocker arms (if not previously done).
2. Using Tool J 8062, compress the valve springs (Fig.
6A6-11) and remove valve keys. Release the compressor tool
and remove spring caps, spring shields, springs and spring
damper. Then remove oil seals.
3. Remove valves from cylinder head and place them in
a rack in their proper sequence so that they can be assembled
in their original positions.
Cleaning
1. Clean all carbon from combustion chambers and valve
ports using Tool J 8089 (Fig. 6A6-12).
2. Thoroughly clean the valve guides using Tool J 8101
(Fig. 6A6- 1 3).
3. Clean all carbon and sludge from push rods, rocker
arms and push rod guides.
4.
Clean valve stems and heads on a buffing wheel.
5. Clean carbon deposits from head gasket mating
surface.
Inspection
1. Inspect the cylinder head for cracks in the exhaust
ports, combustion chambers, or external cracks to the water
chamber.
2. Inspect the valves for burned heads, cracked faces or
damaged stems.
NOTE: Excessive valve stem to bore clearance will cause
excessive oil consumption and may cause valve breakage.
Insufficient clearance will result in noisy and sticky
functioning of the valve and disturb engine smoothness.
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