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6A4-30
1977 PONTIAC SERVICE MANUAL
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Fig.
6A4-79
Engine Lift Fixture
9. Install and align hood with scribe marks.
10. Connect battery cable and ground wires.
11. Add engine oil and coolant.
12. Adjust carburetor idle speeds if necessary.
CRANKSHAFT
Removal (Cylinder Heads On)
1. With engine on stand and oil pan, oil pump and front
cover removed, rotate crankshaft to the position where the
connecting rod nuts are most accessible. Fig. 6A4-80 shows
the engine with the No. 3 and No. 4 rods in the fully extended
position.
2. Remove main bearing caps.
3. Remove connecting rod caps and install threaded
protectors.
4. Note position of keyway in crankshaft so it can be
installed in the same position.
5. Lift crankshaft out of block. Rods will pivot to the
center of the engine when the crankshaft is removed.
Do not allow pistons to move in their bore during or
after crankshaft removal.
Installation
1. Install sufficient oil pan bolts in pan rails to align rods
with rubber bands as shown in Fig. 6A4-80.
Align rods so that the inner thread protectors of adjacent
rods overlap approximately one inch as shown. Alignment
can be adjusted by increasing tension on rubber bands with
additional turns around the pan bolts or thread protectors.
Fig.
6A4-80
Crankshaft Removal
2. Position crankshaft keyway in the same position as
removed and lower into block. The connecting rods will
follow the crank pins into the correct position as the
crankshaft is lowered.
3. Remove rubber bands, thread protectors and pan bolts
and assemble engine.
Removal (Cylinder Heads Removed)
1. With engine on stand, remove oil pan, front cover,
connecting rods, and oil pump.
2. Remove main bearing caps and lift crankshaft out of
block. (Fig. 6A4-8 1)
Installation
1. Measure the crankshaft journals with a micrometer
to determine the correct size rod and main bearings to be
used.
NOTE: Whenever a new or reconditioned crankshaft is
installed, new connecting rod bearings and main
bearings should be installed.
2. Position upper half of main bearings in block and
lubricate with engine oil.
3. Install a new rear main bearing seal. (Fig. 6A4-82)
4. After oil passages into crankshaft have been checked
for being open and shaft is clean, place shaft in block.
Lubricate thrust flanges of the center bearing with 1050169
Lubricant or equivalent. Install caps with lower half of
bearing lubricated with engine oil. Lubricate cap bolts with
engine oil and install, but do not tighten.
5. With a block of wood (Fig. 6A4-83) bump shaft in
each direction to align thrust flanges of center main bearing.
NOTE: After bumping shaft in each direction, wedge
the shaft to the front and hold it while torquing No. 3
cap bolts.
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