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1977 PONTIAC SERVICE MANUAL
4. Remove battery ground cable and engine ground strap
or engine ground strap and automatic transmission oil level
indicator tube bracket on head to be removed.
5. Remove exhaust pipe to manifold bolts.
6. Remove cylinder head bolts (dowel pins will hold head
in place) and remove head with exhaust manifold attached.
(If left head is being removed, it will be necessary to raise head
off dowel pins, move it forward and maneuver the head in
order to clear the power steering and power brake equipment
if car is so equipped).
C A UTI 0 N: Extreme care should be taken when
handling or storing cylinder heads as the rocker
arm studs are hardened and may crack
if
struck.
7. Remove cylinder head gasket.
Replace
Right and left cylinder heads are the same.
When installing new head, core plug or heater water
outlet fitting must be positioned in rear of head depending
on-right or left side of engine
-
transfer all serviceable parts
to new head, using new seals on intake and exhaust valve
stems, and new exhaust manifold gasket.
CAUTION: On 301 engine coat all rocker stud
lower threads and cylinder head bolts with PT
#
1052080 thread sealer or equivalent.
1. Thoroughly clean gasket surfaces of head and block.
Place new gasket on block, and install cylinder head.
2. On 301 engines coat cylinder head bolts with Pt
#
1052080 thread sealer or equivalent on threads and lower
side of heads. (Fig. 6A5-19)
I
I
Fig. 6A5-19 30 1 Cylinder Head Bolt With Sealer Applied
3. Start all bolts and then tighten to 95 lb. ft. using
sequence in Fig. 6A5-20.
4. Install push rods.
5. Reposition rocker arms and tighten rocker arm ball
retaining nuts to 20 lb. ft.
6. Install rocker arm cover and tighten screws.
7. Install push rod cover and tighten screws.
8. Install battery ground strap and engine ground strap
or engine ground strap and automatic transmission oil level
indicator tube bracket Also install the engine oil level
indicator.
9. Install intake manifold using new gaskets and "0"
ring seal.
10.Install exhaust-pipe-to-manifold attaching nuts.
11. Refill cooling system.
Fig. 6A5-20 Head Bolt Torque Sequence
CYLINDER HEAD A N D VALVES
RECONDITION
The condition of the cylinder head and valve mechanism
significantly determines the power, performance and
economy of a valve-in-head engine. Extreme care should be
exercised when conditioning the cylinder head and valves to
maintain correct valve stem-to-guide clearance, correctly
ground valves, and valve seats of correct width.
Disassemble
1. Remove the cylinder head and gasket as previously
described. Place cylinder head on two blocks of wood to
prevent damage.
2. Remove rocker arms.
3. Using valve spring compressor, compress the valve
springs and remove valve locks. Remove spring caps, spring
seats, oil seals, springs and spring dampers (Fig. 6A5-2 1).
4. Remove valves from bottom of cylinder head and
place them in a rack in their proper sequence so they can be
assembled in their original positions.
Clem and Inspect
1. Clean all carbon from combustion chambers and valve
ports.
2. Thoroughly clean the valve guides (Fig. 6A5-22).
3. Clean all carbon and sludge from push rods and rocker
arms.
4. Clean valve stems and heads on a buffing wheel.
5. Clean carbon deposits from head gasket mating
surfaces.
6. Wash all parts in cleaning solvent and dry them
thoroughly.
7. Inspect the cylinder head for cracks in the exhaust
ports, combustion chambers, or external cracks in the water
chamber.
8. Inspect the valves for burned heads, cracked faces or
damaged stems.
9. Check fit of valve stems in their respective bores.
(Excessive valve stem to bore clearance will cause lack of
power, rough idling and noisy valves, and may cause valve
breakage. Insufficient clearance will result in noisy and sticky
functioning of the valve and disturb engine smoothness of
operation).
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