engine coolant NISSAN 300ZX 1984 Z31 Engine Lubrication And Cooling System Workshop Manual

COOLING SYSTEM
Coolicg Circuit
To avoid danger of being scalded, never attempt to drain coolant when engine is hot.
Always replace with new gasket and O-ring.
V
Radlaror
f
+ -
Thermostat
water OuIlet Thermostat
housing
1 Thermostat Open
Thermostat Closed
I intake manifold
(Water parragel Heater
Cylinder block Cylinder head t
SLC553
LC-8

COOLING SYSTEM
-Changing Engine Coolant
Refer to Changing Engine Coolant in section
MA If the hoses connecting engine and heater
have
been disconnected to dismount heater core
unit and engine. always perform the following
work before filling with engine coolant
Set the heater temperature lever or button to
"Full Hot" position
Disconnect the upper hose from water cock,
and
fill the heater core unit with 500 mP (16.9
US fl 02, 17 6 Imp fl 02) or more of coolant
1
2
DO not remove englne ter
SLC609 v
3 Connect the hoses.
-Checking Cooling Systern-
WARNING:
Never remove the radiator cap when the engine
IS
hot, serious burns could be caused by high pressure
fluid escaping from the radiator
Wrap
a thick cloth around cap and carefully re-
move the cap by turning it a quarter turn to allow
built-up pressure
to escape and then turn the cap
all the way off.
CHECKING COOLING SYSTEM HOSES
Check hoses for proper attachment, leaks, cracks,
damage,
loose connections, chafing and deteriora-
tion
CHECKING COOLING SYSTEM FOR LEAKS
Apply pressure to the cooling system by means of
a tester to check for leakage
Test i ng pressure.
157 kPa (1 6 kg/cm2, 23 psi)
CHECKING RADIATOR CAP
Apply pressure to radiator cap by means of
a cap
tester to see if it is satisfactory
Radiator cap relief pressure:
59 - 98 kPa (0.6 - 1.0 kglcm' , 9 - 14 psi)
" SLC613
LC-9

COOLING SYSTEM -Thermostat-
Description (Bottom by-pass coolant flow)
- water OUtkt Coalant flow out
through water Outlet Thermostat
Open A few
r) close Much
SLC565
Disassembly and Assembly
CAUTION:
Drain coolant from drain cocks on cylinder block side and radiator.
Remove radiator shroud, cooling fan and water suction pipe securing bolt, then remove thermostat.
Always replace with new gasket.
After installation. run engine for
a few
and check for leaks. minutes,
SLC555 16.21 N m (1 6.2 1 kg-m, 12.15 ft-lbl
LC-11

SERVICE DATA AND SPECIFICATIONS (S. D.S.)
Engine Cooling System
Radiator
Unit kPa lkg/cm'. psi1
Cap relief pressure
Leakase terr mesure
59 98106 10.9-141
157
I1 6.231 ~~ ~
Thermostat
Standard
76 5 I1701 Valve opentng temperature
Maximum
valve lift
"C I'FI
mmPC Id FI 10190 IO 39/194) ~ ~~~
~ ~
~
Fan coupling
Cut Off point rpm LOW 750
Hlgh Except turbo model 2.450
Turbo model 2.700
Low+ Hightemperature'C I'FI 60.70 1140.1581
Temperature switch (Turbocharged model)
Operatmg temperatwe
OFF - ON "C I'FI 100 (2121
Tightening torque
Unit Nm kgm ft-lb
Water pump securing bolt 16 -21 1621 12-15
Thermostat housing 16-21 16-21 12-15 securing bolt
Water inlet securing bolt
16. 21 16-21 12-15
Water outlet securing bolt 16.21 16-21 12-15
Coolant filler housing bolt 3 - 4 03-04 22-29
Radiator securing bolt 3 -4 03-04 22-29
Radiator hose clamp 3-5 03-05 22-36
Cooling fan securing bolt 6 - 10 06-10 43-72
Fan Coupling securing bolt 6 - 10 06-10 43-72
_- LC-1 f