Infiniti QX4 (R50). Manual — part 496
SLC756A
CHECKING COOLING SYSTEM FOR LEAKS
NBLC0016S04
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
NBLC0017
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.
SLC326B
SLC327B
REMOVAL
NBLC0018
1.
Remove under cover.
2.
Remove suspension member stay.
3.
Drain coolant from radiator.
4.
Remove radiator shrouds.
5.
Remove drive belts.
6.
Remove cooling fan.
7.
Remove water drain plug on water pump side of cylinder block.
8.
Remove chain tensioner cover and water pump cover.
ENGINE COOLING SYSTEM
System Check (Cont’d)
LC-12
SLC328B
9.
Pushing timing chain tensioner sleeve, apply a stopper pin so
it does not return. Then remove the chain tensioner assembly.
SLC941A
10. Remove the 3 water pump fixing bolts. Secure a gap between
water pump gear and timing chain, by turning crankshaft pul-
ley 20° backwards.
JLC357B
11. Put M8 bolts to two water pump fixing bolt holes.
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ENGINE COOLING SYSTEM
Water Pump (Cont’d)
LC-13
SLC116B
12. Tighten M8 bolts by turning half turn alternately until they reach
timing chain rear case.
I
In order to prevent damages to water pump or timing chain rear
case, do not tighten one bolt continuously. Always turn each
bolt half turn each time.
13. Lift up water pump and remove it.
I
When lifting up water pump, do not allow water pump gear to
hit timing chain.
SLC943A
INSPECTION
NBLC0019
1.
Check for badly rusted or corroded body assembly.
2.
Check for rough operation due to excessive end play.
SLC244B
INSTALLATION
NBLC0020
1.
Apply engine oil and coolant to O-rings as shown in the figure.
ENGINE COOLING SYSTEM
Water Pump (Cont’d)
LC-14
SLC031B
2.
Install water pump.
I
Do not allow cylinder block to nip O-rings when installing
water pump.
SLC944A
3.
Before installing, remove all traces of liquid gasket from mat-
ing surface of water pump cover and chain tensioner cover
using a scraper.
Also remove traces of liquid gasket from mating surface of
front cover.
SLC945AA
4.
Apply a continuous bead of liquid gasket to mating surface of
chain tensioner cover and water pump cover.
SLC156B
5.
Return the crankshaft pulley to its original position by turning
it 20° forward.
SLC961A
6.
Install timing chain tensioner, then remove the stopper pin.
I
When installing the timing chain tensioner, engine oil
should be applied to the oil hole and tensioner.
I
After starting engine, let idle for three minutes, then rev
engine up to 3,000 rpm under no load to purge air from the
high-pressure chamber of the chain tensioners. The
engine may produce a rattling noise. This indicates that
air still remains in the chamber and is not a matter of
concern.
7.
Reinstall any parts removed in reverse order of removal.
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE COOLING SYSTEM
Water Pump (Cont’d)
LC-15
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