Pontiac firebird 1968 - Page 275

6-58
1968 PONTIAC SERVICE MANUAL
CAMSHAFT --REPLACE
1. Coat Inner diameters of all camshaft bearings
with oil. Coat camshaft lobes with heavy oiL Care-
fully install camshaft. Rotate camshaft through sev-
eral revolutions to make sure it Is completely free.
If any tight spots are found, remove camshaft and
very carefully polish down the center journal slightly.
If still not free, polish the front and rear journals
slightly. If any particular bearing causes binding of
the camshaft, replace that bearing also.
NOTE; Front center and rear center journals
should not be polished except to remove slight
roughness or scratches. Slight warpage of the
camshaft is not harmful, provided the journals are
polished down until the camshaft rotates freely in
its bearings.
2. With camshaft properly seated, Install camshaft
thrust plate and tighten bolts 20 lb. ft. torque.
3. Install timing chain sprockets and timing chain,
making sure marks on sprockets are aligned properly
(Fig. 6-96).
4. Install fuel pump eccentric and bushing. Tighten
camshaft sprocket retaining bolt 40 lb. ft. torque.
5. Install timing chain cover dowels and new
gasket and tighten cover to cylinder block bolts and
cover to block stud nuts 30 lb. ft. torque.
6. Insert four oil-pan-to-timing-chain-cover
screws and tighten 12 lb. ft. torque.
7. Install fuel pump and tighten bolts 25 lb. ft.
torque.
8. Install harmonic balancer. Tighten bolt 160
lb. ft. torque.
9. Coat base of lifters with heavy oil. Install
hydraulic lifters and push rods, making certain they
are replaced in their original positions.
10. Engage rocker arms on push rods and tighten
rocker arm ball retaining nuts 20 lb. ft. torque.
11. Install push rod cover.
12. Install intake manifold and gasket. Tighten
bolts 40 lb. ft. torque.
NOTE; O-ring seal must be installed between in-
take manifold and timing chain cover before mani-
fold is securely positioned.
13. Install distributor, positioning rotor pointer to
number six cylinder, and install distributor hold-
down clamp. Tighten clamp retaining screw 30 lb. ft.
torque.
14. Install crankcase ventilator outlet pipe and
both rocker arm covers and gaskets. Tighten cover
bolts 65 lb. in. torque.
15. If generator bracket and generator were re-
moved, install and tighten bolts 30 lb. ft. torque.
16. Install fan and pulleys.
17. Install radiator, tightening all bolts securely.
18. Install hood latch bracket and tighten bolts.
19. Connect carburetor linkage, fuel lines and
thermogauge unit.
20. Connect all water hoses, vacuum hose and
spark plug wires.
21. Install carburetor air filter.
22. Refill cooling system and check for leaks.
OIL PAN AND/OR OIL PAN GASKET-
REMOVE AND REPLACE—PONTIAC MODELS
REMOVE
1. Disconnect battery cable.
2. Remove fan shield.
3. On air-conditioned cars, remove fan and pulley
assembly.
4. Disconnect engine ground cables.
5. On air-conditioned cars, remove compressor
from mounting brackets and position to one side.
6. Inspect all water hoses and wiring harnesses
for proper routing to avoid excessive bind when
engine is raised approximately 4 1/2".
7. Raise vehicle and drain crankcase.
8. Disconnect steering idler arm from frame.
9. Remove exhaust crossover pipe. When equipped
with dual exhausts disconnect exhaust pipes from
manifolds.
10. Remove starter assembly and flywheel cover.
11. Position J 22603 ENGINE LIFTING TOOL to
engine and place J 22603-4 CROSS BAR in position on
lifting tool (Fig. 6-74). Bolt tool to timing chain
cover with bolts provided with tool.
12. Using frame jack or hydraulic transmission
jack, support engine at J 22603, remove motor
mounts.