2001 INFINITI QX4 engine

SLC351BA
SLC322B
SLC926
Oil Pressure CheckNBLC0004WARNING:
IBe careful not to burn yourself, as the engine and oil may
be hot.
IOil pressure check should be done in ªParking positionº.
1. Check oil level.
2. Disconnect oil pressure switch harness connector.
3. Remove oil pressure switch using a deep socket. (Commercial
service tool)
4. Install pressure gauge.
5. Start engine and warm it up to normal operating temperature.
6. Check oil pressure with engine running under no-load.
Engine speed
rpmApproximate discharge pressure
kPa (kg/cm2, psi)
Idle speed
2,000More than 98 (1.0, 14)
294 (3.0, 43)
If difference is extreme, check oil passage and oil pump
for oil leaks.
7. After the inspections, install the oil pressure switch as follows.
a. Remove the old sealant adhering to switch and engine.
ENGINE LUBRICATION SYSTEM
Lubrication Circuit (Cont'd)
LC-4

b. Apply Genuine RTV silicone sealant Part No. 999MP-A7007 or
equivalent to the thread and tighten.
13 - 17 N´m (1.25 - 1.75 kg-m,9-12ft-lb)
Oil Pump
REMOVAL AND INSTALLATIONNBLC00051. Remove timing chain. Refer to EM-23, ªRemovalº.
2. Remove oil pump assembly.
IInspect the oil pump after removing it.
3. Reinstall any parts removed in reverse order of removal.
DISASSEMBLY AND ASSEMBLYNBLC0006
SLC323B
IWhen installing oil pump, apply engine oil to rotors.
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ENGINE LUBRICATION SYSTEM
Oil Pressure Check (Cont'd)
LC-5

SLC324B
SLC932A
SLC933A
SLC934AB
OIL PUMP INSPECTIONNBLC0007IInstall oil pump with the groove of the inner rotor facing
the oil pump cover.
Using a feeler gauge, straightedge and micrometers, check the
following clearances:
Unit: mm (in)
Body to outer rotor radial clearance 1 0.114 - 0.200 (0.0045 - 0.0079)
Inner rotor to outer gear tip clearance
2Below 0.18 (0.0071)
Body to inner rotor axial clearance 3 0.030 - 0.070 (0.0012 - 0.0028)
Body to outer rotor axial clearance 4 0.050 - 0.110 (0.0020 - 0.0043)
Inner rotor to brazed portion of hous-
ing clearance 50.045 - 0.091 (0.0018 - 0.0036)
IIf the tip clearance (2) exceeds the limit, replace rotor set.
IIf body to rotor clearances (1, 3, 4, 5) exceed the limit,
replace oil pump body assembly.
SLC251B
REGULATOR VALVE INSPECTIONNBLC00081. Visually inspect components for wear and damage.
2. Check oil pressure regulator valve sliding surface and valve
spring.
3. Coat regulator valve with engine oil. Check that it falls
smoothly into the valve hole by its own weight.
If damaged, replace regulator valve set or oil pump body.
ENGINE LUBRICATION SYSTEM
Oil Pump (Cont'd)
LC-6

SLC935AA
4. Check regulator valve to oil pump body clearance.
Clearance:
6 : 0.040 - 0.097 mm (0.0016 - 0.0038 in)
If it exceeds the limit, replace oil pump body.
ALC094
OIL FILTERNBLC0009The oil filter is a small, full-flow cartridge type and is provided with
a relief valve.
IUse Tool specified in MA-18 for changing oil filter.
Oil Cooler
REMOVAL AND INSTALLATIONNBLC0036
SLC332B
1. Drain engine oil and coolant.
IDo not spill coolant on the drive belt.
2. Remove oil cooler.
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ENGINE LUBRICATION SYSTEM
Oil Pump (Cont'd)
LC-7

IInspect the oil cooler after removing it.
SLC333B
3. Installation is in reverse order of removal.
IWhen installing the oil cooler, align the oil cooler stopper
with the stopper of the oil cooler bracket.
INSPECTIONNBLC0037Oil CoolerNBLC0037S011. Check oil cooler for cracks.
2. Check oil cooler for clogging by blowing through coolant inlet.
If necessary, replace oil cooler assembly.
Oil Pressure Relief ValveNBLC0037S02Inspect oil pressure relief valve for movement, cracks and breaks
by pushing the ball. If replacement is necessary, remove valve by
prying it out with a suitable tool. Install a new valve in place by
tapping it.
Service Data and Specifications (SDS)
OIL PRESSURENBLC0010
Engine speed
rpmApproximate discharge pressure
kPa (kg/cm2, psi)
Idle speed
2,000More than 98 (1.0, 14)
294 (3.0, 43)
REGULATOR VALVENBLC0011Unit: mm (in)
Regulator valve to oil pump cover clearance 0.040 - 0.097 (0.0016 - 0.0038)
OIL PUMPNBLC0012Unit: mm (in)
Body to outer rotor radial clearance 0.114 - 0.200 (0.0045 - 0.0079)
Inner rotor to outer rotor tip clearance Below 0.18 (0.0071)
Body to inner rotor axial clearance 0.030 - 0.070 (0.0012 - 0.0028)
Body to outer rotor axial clearance 0.050 - 0.110 (0.0020 - 0.0043)
Inner rotor to brazed portion of housing clearance 0.045 - 0.091 (0.0018 - 0.0036)
ENGINE LUBRICATION SYSTEM
Oil Cooler (Cont'd)
LC-8

SEM164F
AEM080
Precautions
LIQUID GASKET APPLICATION PROCEDURENBLC00131. Use a scraper to remove all traces of old liquid gasket from
mating surfaces and grooves. Also, completely clean any oil
from these areas.
2. Apply a continuous bead of liquid gasket to mating surfaces.
(Use Genuine RTV silicone sealant Part No. 999MP-A7007
or equivalent.)
IFor oil pan, be sure liquid gasket diameter is 4.0 to 5.0 mm
(0.157 to 0.197 in).
IFor areas except oil pan, be sure liquid gasket diameter is 2.0
to 3.0 mm (0.079 to 0.118 in).
3. Apply liquid gasket around the inner side of bolt holes (unless
otherwise specified).
4. Assembly should be done within 5 minutes after coating.
5. Wait at least 30 minutes before refilling engine oil and engine
coolant.
Preparation
SPECIAL SERVICE TOOLSNBLC0014The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
WS39930000
(Ð)
Tube pressure
NT052
Pressing the tube of liquid gasket
EG17650301
(J33984-A)
Radiator cap tester
adapter
NT564
Adapting radiator cap tester to radiator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV99103510
(Ð)
Radiator plate pliers A
NT224
Installing radiator upper and lower tanks
KV99103520
(Ð)
Radiator plate pliers B
NT225
Removing radiator upper and lower tanks
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ENGINE COOLING SYSTEM
Precautions
LC-9

Cooling CircuitNBLC0015
SLC321B
SLC325B
ENGINE COOLING SYSTEM
Cooling Circuit
LC-10

System CheckNBLC0016WARNING:
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 HOSESNBLC0016S01Check hoses for improper attachment, leaks, cracks, damage,
loose connections, chafing and deterioration.
CHECKING RADIATORNBLC0016S02Check radiator for mud or clogging. If necessary, clean radiator as
follows.
IBe careful not to bend or damage the radiator fins.
IWhen 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.
IUse 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 CAPNBLC0016S03To check radiator cap, apply pressure to cap with a tester.
Radiator cap relief pressure:
Standard
78-98kPa
(0.8 - 1.0 kg/cm
2, 11 - 14 psi)
Limit
59-98kPa
(0.6 - 1.0 kg/cm
2,9-14psi)
SMA967B
Pull the negative pressure valve to open it.
Check that it closes completely when released.
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ENGINE COOLING SYSTEM
System Check
LC-11