Infiniti QX4 (R50). Manual — part 494
SLC351BA
SLC322B
SLC926
Oil Pressure Check
NBLC0004
WARNING:
I
Be careful not to burn yourself, as the engine and oil may
be hot.
I
Oil pressure check should be done in “Parking position”.
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
rpm
Approximate discharge pressure
kPa (kg/cm
2
, psi)
Idle speed
2,000
More 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 - 12 ft-lb)
Oil Pump
REMOVAL AND INSTALLATION
NBLC0005
1.
Remove timing chain. Refer to EM-23, “Removal”.
2.
Remove oil pump assembly.
I
Inspect the oil pump after removing it.
3.
Reinstall any parts removed in reverse order of removal.
DISASSEMBLY AND ASSEMBLY
NBLC0006
SLC323B
I
When installing oil pump, apply engine oil to rotors.
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE LUBRICATION SYSTEM
Oil Pressure Check (Cont’d)
LC-5
SLC324B
SLC932A
SLC933A
SLC934AB
OIL PUMP INSPECTION
NBLC0007
I
Install 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
2
Below 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 5
0.045 - 0.091 (0.0018 - 0.0036)
I
If the tip clearance (2) exceeds the limit, replace rotor set.
I
If body to rotor clearances (1, 3, 4, 5) exceed the limit,
replace oil pump body assembly.
SLC251B
REGULATOR VALVE INSPECTION
NBLC0008
1.
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 FILTER
NBLC0009
The oil filter is a small, full-flow cartridge type and is provided with
a relief valve.
I
Use Tool specified in MA-18 for changing oil filter.
Oil Cooler
REMOVAL AND INSTALLATION
NBLC0036
SLC332B
1.
Drain engine oil and coolant.
I
Do not spill coolant on the drive belt.
2.
Remove oil cooler.
GI
MA
EM
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ENGINE LUBRICATION SYSTEM
Oil Pump (Cont’d)
LC-7
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