Fuel System - Chevrolet 10 Series 1970 Service Manual

LUBRICATION 0-14
plain w ater a re not recom m ended fo r your v e ­
hicle at any tim e.
The coolant le v e l should be approxim ately one inch b e ­
low bottom o f the f ille r neck on downflow when engine is
cold. On c ro ssflo w ra d ia tors, if the engine is cold, the
coolant le v e l should be three inches below bottom o f fille r
neck. On P A 20-30 m odels the coolant le v e l should be
1/2" to 1" below bottom o f f ille r neck when engine is hot.
If checked when engine is cold, the coolant le v e l should
just co v e r the ends o f the tubes. DO NOT O V E R F IL L .
CAUTIO N: When the engine is at norm al o p e r­
ating tem perature o r above, the internal p r e s ­
sure built up in the cooling system w ill blow out
scalding fluid and vapors if the rad iator cap is
suddenly rem oved. T o preven t lo s s o f coolant
and to avoid the danger o f being burned, the c o o l­
ant le v e l should be checked o r coolant added
only when the engine is cool. If the cap must be
rem oved when the engine is hot, place a cloth
o v e r the cap and rotate the cap slow ly coun ter-
clockw ise to fir s t stop and allow p ressu re to
escape com pletely. Then turn cap again slow ly
counterclockw ise to re m o v e .
NOTE: Do not rem o ve the radiator cap when
engine is e x c e s s iv e ly hot, do not put w ater in an
overheated engine, and do not run engine when
indicator is above " H"
com es on.
Thermostat
The cooling system is p rotected and con trolled by a
th erm ostat in stalled in the engine coolant outlet to m ain­
tain a satisfactory operating tem perature o f the engine.
T h is therm ostat is designed fo r continuous use through
both w inter and sum m er and need not be changed sea­
sonally.
Radiator Pressure Cap
The rad iator cap, a 9, 13 o r 15-lb. p ressu re type, must
be installed tightly, oth erw ise coolant may be lo st and
Type of
Engine S ervice
Ligh t Load and speed
with considerable idling.
L igh t Load and speed.
M edium Load and speed.
Heavy Load and high
speed with idling.
Heavy Load and high
speed.
*N O T E : F o r m ost sa tisfa cto ry engine life , use only those No. 2-D d ie s e l fu el o ils containing 0.50% o r less sulfur.
o r red indicator light
DIESEL FUEL SELECTION CHART
Typical
Application
C ity Buses
G en erator sets, industrial
and automotive equipment
in city and suburban
operation
M arine P lea su re C raft,
T r a c to rs , Industrial
equipment.
Highway Trucks
Heavy Duty O ff-th e-roa d
Equipment, Trucks,
T ra c to rs .
damage to engine may resu lt from overheating. Radiator
p ressu re caps should be checked p e rio d ic a lly fo r p rop er
operation.

FUEL SYSTEM

Inline Filter
R eplace entire filt e r e v e ry 24,000 m iles.
Fuel Strainer
The fram e mounted fuel stra in er assem bly, located
between the fuel pump and fuel tank (standard equipment
on 60 S eries and optional equipment on a ll other m odels)
should be replaced seasonally
Fuel Pump
The fuel pump should be checked regu la rly to make
sure the mounting bolts,
diaphragm co v e r screw s and inlet connections are tight.
Carburetor
Tighten the carbu retor to m anifold and the m anifold to
cylin d er head stud nuts to prevent a ir leaks. Keep the
ca rb u retor clean extern ally and com pletely overhauled at
reg u la r in terva ls.
Carburetor and Throttle Linkage
Lubricate with engine o il ev e ry 12,000 m iles.
Fuel F ilte r E lem en t--T h e gasoline fuel filt e r elem ent
must be replaced in the event o f ca rb u retor flooding.
The filte r elem ent located in the carbu retor inlet is to be
replaced e v e ry 12 months or
occu rs firs t.
NOTE: When also equipped with an in -lin e fuel
filte r , it w ill be necessary to change this carbu­
r e to r fuel inlet filt e r only at each 24,000 m ile
in terval.
G overnor
The attaching bolts should be kept tight, the optionally
a vailable govern or should be kept clean extern ally and the
filt e r elem ent should be replaced ev e ry 12,000 m iles.
G eneral Fuel
90% B oiling
C lassifica tion
Point (Max.)
No. 1-D 500° F 0
W inter No. 1-D 500°
Summer No. 1-D 550°
W inter No. 1-D 550° F.
Summer No. 2-D* 625° F.
W inter No. 2-D* 625°
Summer No. 2-D* 625°
No. 2-D* 675° F.
co ver to body bolts, pulsator
12,000 m iles, w h ichever
D istillation
Cetane
Final B oiling Number
Point (M ax.) (M in.)
550° F. 45
F. 550° F. 45
F. 600° F. 40
600° F. 45
675° F. 40
F. 675° F . 45
F. 675° F. 40
40
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CHEVROLET TRUCK SERVICE MANUAL
Sulfur
Content
(M ax.)
0.30%
0.30%
0.50%
0.50%
0.50%
0.50%
0.50%
0.50%