Infiniti I30 (A33). Manual — part 546
Cooling Circuit
NHLC0015
SLC391B
SLC392B
GI
MA
EM
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Cooling Circuit
LC-9
System Check
NHLC0016
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 the cap and carefully remove it 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
NHLC0016S01
Check hoses for improper attachment, leaks, cracks, damage,
loose connections, chafing and deterioration.
CHECKING RADIATOR
NHLC0016S02
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, radiator 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 downward.
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 downward.
I
Use compressed 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.
SLC755A
CHECKING RADIATOR CAP
NHLC0016S03
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.
ENGINE COOLING SYSTEM
System Check
LC-10
SLC756A
CHECKING COOLING SYSTEM FOR LEAKS
NHLC0016S04
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 than the specified pressure may cause radiator
damage.
Water Pump
REMOVAL AND INSTALLATION
NHLC0017
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.
SLC154BD
SLC939A
REMOVAL
NHLC0018
1.
Drain coolant from drain plugs on radiator and right side of
cylinder block. Refer to MA-14, “Changing Engine Coolant”.
2.
Remove right side engine mounting, mounting bracket and
nuts.
3.
Remove drive belts and idler pulley bracket.
4.
Remove water pump drain plug.
5.
Remove chain tensioner cover and water pump cover.
GI
MA
EM
EC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
System Check (Cont’d)
LC-11
SLC940A
6.
Pushing timing chain tensioner sleeve, apply a stopper pin so
it does not return. Then remove the chain tensioner assembly.
SLC941A
7.
Remove the 3 water pump fixing bolts. Secure a gap between
water pump gear and timing chain, by turning crankshaft pul-
ley 20° backwards.
SLC942A
8.
Put M8 bolts to two M8-threaded holes out of 3 water pump
fixing bolt holes.
ENGINE COOLING SYSTEM
Water Pump (Cont’d)
LC-12
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