Pontiac tempest 1968 Service Manual page 343

6 C - 4
1968 P O N T I A C SERVICE M A N U A L
fold, apply some heavy oil around the suspected
area
c
Tighten all bolts to specification and sequence
as outlined in section 6. If gasket is bad, replace.
AIR CLEANER ELEMENT
Wash polyurethane element (heavy duty) in solvent
and re-oil with SAE 30 engine oil. Paper element
should be replaced if clogged. Do not attempt to
clean with an air hose.
NOTE: Air cleaner should be serviced after each
occasion of driving under severe dust conditions.
CHECK FUEL LINES AND SERVICE FUEL FILTER
1. Inspect fuel lines for kinks, bends or leaks and
correct any defects found. If necessary to replace
fuel line, use only steel double flared end lines.
2. Replace filter in carburetor inlet.
NOTE: If a complaint of poor high speed per­
formance exists on the vehicle, fuel pump tests
described in section 6B (Diagnosis manual) should
be performed.
INSPECT AND SERVICE COOLING SYSTEM
Inspect cooling system for leaks, weak hoses,
loose hose clamps and correct coolant level, and
service as required.
NOTE: A cooling system pressure test, as de­
scribed in section 6A (Diagnosis manual) may be
performed to detect internal or external leaks
within the cooling system.
CHECK LUBRICANT LEVEL AND
INSPECT FOR OIL LEAKS
Check level of lubricant in crankcase and inspect
engine for oil leaks.
BATTERY
VOLTMETER I 1 . " 1 1 1 •
DWELL METER TACHOMETER
CHECK CARBURETOR CHOKE AND UNLOADER
OPERATION AND ADJUSTMENT
The specified choke setting provides ideal choke
operation in all climates. No seasonal changes are
necessary. For setting, see ENGINE F U E L , sec­
tion 6B.
Choke linkage and fast idle cam must operate
freely. Do not lubricate linkage since this will col­
lect dust and cause sticking.
Check unloader adjustment, see section 6B.
I D L E STOP SOLENOID
Adjust idle stop solenoid to obtain correct idle
speed (solenoid active speed). Observe operation of
idle stop solenoid by disconnecting lead, with engine
running at specified hot idle speed, the plunger
should drop back allowing the idle screw to contact
the carburetor idle cam. In this position the engine
speed should drop to the specified lower solenoid
inactive idle speed. (See Section 6D for proper idle
setting and procedures.)
CONNELI IUNE-UP EQUIPMENT
Follow manufacturers recommendations for the use
of testing equipment. Fig. 6C-1 shows a basic sche­
matic for instrumentation which will apply to many
types of test equipment and may be used as a rough
guide if equipment manufacturer's instructions are
not available.
Connections shown in Fig. 6C-1 are made as
follows:
1. Timing light
a. Positive lead to positive battery terminal.
b. Negative lead to ground.
c. Trigger lead to number 1 spark plug.
2. Tachometer
a. Positive lead to distributor side of coil.
b. Negative lead to ground.
3. Dwell Meter
a. Positive lead to distributor side of coil.
b. Negative lead to ground.
TEST DWELL AND DWELL VARIATION
Fig. 6 C - 1 Schematic of Tune-Up Instrumentation Two methods are offered for dwell or point gap