Pontiac FIREBIRD 1972 Service Manual page 638

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1972 PONTIAC SERVICE MANUAL
6 CYLINDER
REMOVE
Drain cooling system and remove water inlet and
heater hoses.
Remove all fan and accessory drive belts.
Remove fan and pump pulley.
Remove water pump to cylinder block attaching
bolts and remove pump from engine.
REPLACE
Clean gasket surfaces and install new gaskets.
Install pump and attaching bolts. Tighten to 20 lb. ft.
torque.
Replace fan and pump pulley.
Install all fan and accessory drive belts.
Install water inlet and heater hoses on water pump.
Refill cooling system with coolant.
RADIATOR
REMOVE A N D REPLACE (Figs. 6A-17.6A-18,
6A-19, 6A-20 and 6A-21)
Drain radiator.
Remove fan (except B Series).
Disconnect upper and lower radiator hoses.
On vehicles equipped with automatic transmission,
disconnect and plug transmission cooler lines.
Remove fan shield assembly (L-6).
Remove radiator and shroud assembly by lifting
straight up.
NOTE: The radiator assembly is held at the
bottom by two cradles secured to the radiator
support.
If installing new 'radiator, transfer fittings from old
radiator to new radiator.
Replace radiator assembly by reversing the above
steps, checking to assure radiator lower cradles are
located properly in radiator recess.
Refill radiator. Run engine for a short period of time
and check for leaks. If automatic transmission radia-
tor, recheck transmission oil level.
ENGINE LUBRICATION SYSTEM
OIL PUMP
8 CYLINDER
Oil is circulated under pressure by a spur, gear-type pump.
The pump is mounted on the right rear bottom of the
cylinder block and is driven by the distributor drive gear.
Maximum oil pressure is regulated by a spring-loaded,
ball-type, pressure regulator valve. No adjustment of the
pressure regulator valve is provided.
Oil is taken into the pump through a stationary-type oil
intake. All oil entering the intake passes through a screen.
As a safety precaution, a large hole is provided in the
middle of screen. During normal operation, no oil can pass
through this hole since the grommet around the hole is
seated against a baffle. If the screen should become
plugged, however, pump suction will cause the screen to
move away from the baffle and oil will flow through the
large center hole.
6 CYLINDER
Oil is circulated under pressure by a spur, gear- type
pump. The pump is mounted on the right front of the
cylinder block and is driven by the distributor drive gear.
Maximum oil pressure is regulated by a spring-loaded
pressure regulator valve. No adjustment of the pressure-
regulator valve is provided.
Oil is taken into the pump through a stationary-type oil
intake. All oil entering the intake passes through a screen.
As a safety precaution, a large hole is provided in the
screen. During normal operation, no oil can pass through
this hole since the grommet around the hole is seated
against the baffle. If the screen should become plugged,
however, pump suction will cause the screen to move
away from the baffle, and oil will flow through the large
center hole.
OIL CIRCULATION
8 CYLINDER
The positive pressure system delivers oil under pressure to
the crankshaft, connecting rods, camshaft bearings and to
valve train parts. Each cylinder wall is lubricated by a
metered jet from the groove in the opposite connecting
rod. Splash from the jet and off the crankshaft lubricates