Infiniti G20 (P11). Manual — part 475
SLC343
INSPECTION
NCLC0022
1.
Check for valve seating condition at normal room temperature.
It should seat tightly.
2.
Check valve opening temperature and valve lift.
Valve opening temperature
°C (°F)
82 (180)
Valve lift
mm/°C (in/°F)
More than 8/95 (0.31/203)
3.
Then check if valve closes at 5°C (9°F) below valve opening
temperature.
SLC268B
Water Outlet
INSPECTION
NCLC0023
Visually inspect for water leaks. If there is leakage, apply liquid
gasket.
BLC004
INSTALLATION
NCLC0024
1.
Use a scraper to remove old liquid gasket from water outlet.
I
Also remove traces of liquid gasket from mating surface
of cylinder head.
2.
Apply a continuous bead of liquid gasket to mating surface of
water outlet.
I
Use Genuine RTV silicone sealant part No. 999MP-A7007
or equivalent.
I
When installing, tighten water outlet bolts to the specified
torque.
: 6.3 - 8.3 N·m (0.64 - 0.85 kg-m, 55.6 - 73.8 in-lb)
GI
MA
EM
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Thermostat (Cont’d)
LC-13
Radiator
COMPONENTS
NCLC0025
SLC395B
1.
Reservoir tank
2.
Mounting bracket
3.
Mounting rubber
4.
Radiator
5.
Washer
6.
Oil cooler hose (A/T models)
7.
Lower hose
8.
Air guide plate
9.
Cooling fan assembly
10. Upper hose
11. Radiator cap
Cooling Fan Control System
Cooling fans are controlled by the ECM. For details, refer to EC-420,
“Cooling Fan”.
ENGINE COOLING SYSTEM
Radiator
LC-14
Refilling Engine Coolant
NCLC0027
For details on refilling engine coolant, refer to MA-14, “Changing
Engine Coolant”.
Overheating Cause Analysis
NCLC0028
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat stuck closed
—
Damaged fins
Dust contamination or
paper clogging
Mechanical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
—
—
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud
—
—
—
Improper coolant mixture
ratio
—
—
—
Poor coolant quality
—
—
—
Insufficient coolant
Coolant leaks
Cooling hose
Loose clamp
Cracked hose
Water pump
Poor sealing
Radiator cap
Loose
Poor sealing
Radiator
O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank
Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leaks into
cooling system
Cylinder head deterioration
Cylinder head gasket dete-
rioration
GI
MA
EM
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Refilling Engine Coolant
LC-15
Symptom
Check items
Except cool-
ing system
parts mal-
function
—
Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow
Blocked bumper
—
—
Blocked radiator grille
Installed car brassiere
Mud contamination or
paper clogging
Blocked radiator
—
Blocked condenser
—
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTAT
NCLC0029
Valve opening temperature
°C (°F)
82 (180)
Valve lift
mm/°C (in/°F)
More than 8/95 (0.31/203)
RADIATOR
NCLC0030
Unit: kPa (kg/cm
2
, psi)
Cap reliefpressure
Standard
78 - 98 (0.8 - 1.0, 11 - 14)
Limit
59 - 98 (0.6 - 1.0, 9 - 14)
Leakage test pressure
157 (1.6, 23)
ENGINE COOLING SYSTEM
Overheating Cause Analysis (Cont’d)
LC-16
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