Fuel System; Inline Filter; Fuel Strainer; Fuel Pump - Chevrolet 10 1971 Series Chassis Service Manual

2, and 3 a sufficient number of times until the drained
liquid is colorless.
5. Allow system to drain completely and then close
radiator drain valve tightly.
6. Add the necessary amount of high quality inhibited
glycol base coolant meeting GM Specification 1899-M
to provide the required freezing and corrosion pro­
tection (at least to 0°F.)
7. Run engine until normal operating temperature is
reached.
8. Check and adjust level of coolant after system has
cooled sufficiently to remove radiator cap.
The freeze protection should be at a level commen­
surate with the temperatures which may occur in the
area in which the vehicle will be operated. Regardless
of whether freezing temperatures are or are not ex­
pected, cooling system protection should be maintained
at least to 0°F. to provide adequate corrosion protection.
When adding solution due to loss of coolant for any reason
or in areas where temperatures lower than -20°F. (-32°F
in Canada) may occur, a sufficient amount of an ethylene
glycol base coolant meeting GM Specification 1899-M
should be used.
Alcohol or methanol base coolants or
NOTE:
plain water are not recommended for your ve­
hicle at any time.
The coolant level should be approximately one inch be­
low bottom of the filler neck when engine is cold. DO
NOT OVERFILL.
When the engine is at normal oper­
CAUTION:
ating temperature or above, the internal pres-
sure built up in the cooling system will blow out
scalding fluid and vapors if the radiator cap is
suddenly removed. To prevent loss of coolant
and to avoid the danger of being burned, the cool­
ant level should be checked or coolant added
only when the engine is cool. If the cap must be
removed when the engine is hot, place a cloth
over the cap and rotate the cap slowly counter-
clockwise to first stop and allow pressure to
escape completely. Then turn cap again slowly
counterclockwise to remove.
Do not remove the radiator cap when
NOTE:
engine is excessively hot, do not put water in an
overheated engine, and do not run engine when
indicator is above " H" or red indicator light
comes on.
Thermostat
The cooling system is protected and controlled by a
thermostat installed in the engine coolant outlet to main­
tain a satisfactory operating temperature of the engine.
This thermostat is designed for continuous use through
both winter and summer and need not be changed sea­
sonally.
Radiator Pressure Cap
The radiator cap, a 15-lb. pressure type, must be in­
stalled tightly, otherwise coolant may be lost and damage
to engine may result from overheating. Radiator pressure
caps should be checked periodically for proper operation.

FUEL SYSTEM

Inline Filter

Replace entire filter every 24,000 miles.

Fuel Strainer

The frame mounted fuel strainer assembly, located
between the fuel pump and fuel tank (standard equipment
on 60 Series and optional equipment on all other models)
should be replaced seasonally.

Fuel Pump

The fuel pump should be checked regularly to make
sure the mounting bolts, cover to body bolts, pulsator
diaphragm cover screws and inlet connections are tight.
Carburetor
Tighten the carburetor to manifold and the manifold to
cylinder head stud nuts to prevent air leaks. Keep the
carburetor clean externally and completely overhauled at
regular intervals.
Carburetor and Throttle Linkage
Lubricate with engine oil every 12,000 miles.
Fuel Filter Element--The gasoline fuel filter element
must be replaced in the event of carburetor flooding.
The filter element located in the carburetor inlet is to be
replaced every 12 months or 12,000 miles, whichever
occurs first.
When also equipped with an in-line fuel
NOTE:
filter, it will be necessary to change this carbu­
retor fuel inlet filter only at each 24,000 mile
interval.
Governor
The attaching bolts should be kept tight, the optionally
available governor should be kept clean externally and the
filter element should be replaced every 12,000 miles.
CLUTCH A N D TRANSMISSIONS
CLUTCH
The clutch pedal free travel should be checked at regu­
lar intervals.
Lubricate the clutch cross-shaft at fitting every 6000
miles with water resistant EP chassis lubricant.
Clutch and Brake Pedal Springs
Lubricate with engine oil every 6000 miles.
M A N U A L TRANSM ISSIO NS
The lubricant level in the housing should be checked
every 6,000 miles or 4 months with unit at operating
temperature. Lubricant should be level with bottom of
filler plug hole. SAE 80 or SAE 90 GL-5 gear lubricant
is recommended if additions are required to bring up
the lubricant level.
LUBRICATION 0-11
10-30 CHEVROLET TRUCK SERVICE MANUAL