Infiniti G20 (P11). Manual — part 474
Cooling Circuit
NCLC0016
SLC043B
System Check
NCLC0017
WARNING:
Never remove the radiator cap when the engine is hot. Serious
burns could occur from high pressure coolant escaping from
the radiator.
Wrap a thick cloth around the cap. Slowly turn it a quarter turn
to allow built-up pressure to escape. Carefully remove the cap
by turning it all the way.
CHECKING COOLING SYSTEM HOSES
NCLC0017S01
Check hoses for the following:
I
Improper attachment
I
Leaks
I
Cracks
I
Damage
I
Chafing
I
Deterioration
SLC756A
CHECKING COOLING SYSTEM FOR LEAKS
NCLC0017S02
To check for leakage, apply pressure to the cooling system with a
tester.
Testing pressure:
157 kPa (1.6 kg/cm
2
, 23 psi)
CAUTION:
Higher pressure than specified may cause radiator damage.
GI
MA
EM
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Cooling Circuit
LC-9
CHECKING RADIATOR
NCLC0017S04
Check radiator for mud or clogging. If necessary, clean radiator as
follows.
I
Be careful not to bend or damage the radiator fins.
I
When radiator is cleaned without removal, remove all sur-
rounding parts such as cooling fan, rediator shroud and horns.
Then tape the harness and connectors to prevent water from
entering.
1.
Apply water by hose to the back side of the radiator core ver-
tically download.
2.
Apply water again to all radiator core surfaces once per
minute.
3.
Stop washing if any stains no longer flow out from the radia-
tor.
4.
Blow air into the back side of radiator core vertically download.
I
Use compressesd air lower than 490 kPa (5 kg/cm
2
, 71 psi)
and keep distance more than 30 cm (11.8 in).
5.
Blow air again into all the radiator core surfaces once per
minute until no water sprays out.
ALC017
CHECKING RADIATOR CAP
NCLC0017S03
To check radiator cap, apply pressure to cap with a tester.
Radiator cap relief pressure:
Standard
78 - 98 kPa (0.8 - 1.0 kg/cm
2
, 11 - 14 psi)
Limit
59 - 98 kPa (0.6 - 1.0 kg/cm
2
, 9 - 14 psi)
SMA967B
Pull the negative pressure valve to open it.
Check that it closes completely when released.
SLC266B
Water Pump
REMOVAL
NCLC0018
1.
Drain coolant from radiator.
2.
Remove cylinder block drain plug located at left front of cylin-
der block and drain coolant.
3.
Remove front RH wheel and engine side cover.
4.
Remove drive belts. Refer to MA-13, “Checking Drive Belts”.
5.
Remove RH engine mounting. Refer to EM-53, “ENGINE
REMOVAL”.
ENGINE COOLING SYSTEM
System Check (Cont’d)
LC-10
SLC556AB
6.
Remove water pump.
CAUTION:
I
When removing water pump assembly, be careful not to
get coolant on drive belt.
I
Water pump cannot be disassembled and should be
replaced as a unit.
I
After installing water pump, connect hose and clamp
securely, then check for leaks using radiator cap tester.
SLC408C
INSPECTION
NCLC0019
I
Check body assembly for rust or corrosion.
I
Check for rough operation due to excessive end play.
SLC433A
INSTALLATION
NCLC0020
1.
Use a scraper to remove liquid gasket from water pump.
I
Also remove traces of liquid gasket from mating surface
of cylinder block.
SLC434AA
2.
Apply a continuous bead of liquid gasket to mating surface of
water pump.
I
Use Genuine RTV silicone sealant part No. 999MP-A7007
or equivalent.
When filling radiator with coolant, refer to MA-14, “Changing
Engine Coolant”.
When installing drive belts, refer to MA-13, “Checking Drive
Belts”.
GI
MA
EM
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Water Pump (Cont’d)
LC-11
Thermostat
REMOVAL AND INSTALLATION
NCLC0021
SLC267B
Be careful not to spill coolant over engine compartment. Use
a rag to absorb coolant.
1.
Drain engine coolant.
2.
Remove lower radiator hose.
3.
Remove water inlet, then take out thermostat.
SLC767
4.
Install thermostat with jiggle valve or air bleeder at upper side.
I
Apply a continuous bead of liquid gasket to mating sur-
face of water inlet.
I
After installation, run engine for a few minutes, and check
for leaks.
ENGINE COOLING SYSTEM
Thermostat
LC-12
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