Infiniti Q45 (FY33). Manual — part 500
SLC934
2.
Check for leakage.
SLC113B
Cooling Fan (Crankshaft driven)
DISASSEMBLY AND ASSEMBLY
SLC072
INSPECTION
Check fan coupling for rough operation, oil leakage or bent bimetal.
SLC114BA
Cooling Fan (Motor driven)
Cooling fan is controlled by ECM. For details, refer to “Overheat”,
“TROUBLE DIAGNOSIS FOR OVERHEAT” in EC section.
GI
MA
EM
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
ENGINE COOLING SYSTEM
Radiator (Cont’d)
LC-17
Overheating Cause Analysis
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
Fan coupling does not operate.
—
—
Cooling fan does not operate.
High resistance to fan rotation
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, deteriora-
tion 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 deteriora-
tion
Except cool-
ing system
parts malfunc-
tion
—
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 malfunction
—
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
ENGINE COOLING SYSTEM
LC-18
Engine Lubrication System
Oil pressure check
Engine speed
rpm
Approximate discharge
pressure kPa (kg/cm
2
, psi)
Idle speed
More than 98 (1.0, 14)
3,000
461 - 559 (4.7 - 5.7, 67 - 81)
Regulator valve inspection
Unit: mm (in)
Regulator valve to oil pump clear-
ance
q
L
0.040 - 0.097 (0.0016 - 0.0038)
Oil pump
Unit: mm (in)
Drive shaft to oil pump cover and
housing clearance
q
C
0.024 - 0.069 (0.0009 - 0.0027)
Driven gear to driven shaft clear-
ance
q
F
0.025 - 0.064 (0.0010 - 0.0025)
Drive and driven gear to oil pump
housing axial clearance
q
G
0.08 - 0.130 (0.0031 - 0.0051)
Drive and driven gear to oil pump
housing radial clearance
q
H
0.125 - 0.245 (0.0049 - 0.0096)
Engine Cooling System
Thermostat
Standard
Valve opening temperature
°C (°F)
82 (180)
Valve lift
mm/°C (in/°F)
More than 10/95 (0.39/203)
Radiator
Unit: kPa (kg/cm
2
, psi)
Cap relief pressure
Standard
98 - 118 (1.0 - 1.2, 14 - 17)
Limit
59 - 118 (0.6 - 1.2, 9 - 17)
Leakage test pressure
157 (1.6, 23)
GI
MA
EM
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
LC-19
NOTES
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