Infiniti QX4 (R50). Manual - part 493

NOTES

ENGINE LUBRICATION &

COOLING SYSTEMS

SECTION

LC

CONTENTS

ENGINE LUBRICATION SYSTEM..................................2

Precautions ..................................................................2

LIQUID GASKET APPLICATION PROCEDURE

............2

Preparation ..................................................................2

SPECIAL SERVICE TOOLS

........................................2

COMMERCIAL SERVICE TOOL

..................................3

Lubrication Circuit ........................................................3
Oil Pressure Check......................................................4
Oil Pump ......................................................................5

REMOVAL AND INSTALLATION

.................................5

DISASSEMBLY AND ASSEMBLY

................................5

OIL PUMP INSPECTION

............................................6

REGULATOR VALVE INSPECTION

............................6

OIL FILTER

...............................................................7

Oil Cooler.....................................................................7

REMOVAL AND INSTALLATION

.................................7

INSPECTION

.............................................................8

Service Data and Specifications (SDS).......................8

OIL PRESSURE

........................................................8

REGULATOR VALVE

.................................................8

OIL PUMP

.................................................................8

ENGINE COOLING SYSTEM..........................................9

Precautions ..................................................................9

LIQUID GASKET APPLICATION PROCEDURE

............9

Preparation ..................................................................9

SPECIAL SERVICE TOOLS

........................................9

Cooling Circuit ...........................................................10
System Check............................................................ 11

CHECKING COOLING SYSTEM HOSES

................... 11

CHECKING RADIATOR

............................................ 11

CHECKING RADIATOR CAP

.................................... 11

CHECKING COOLING SYSTEM FOR LEAKS

............12

Water Pump ...............................................................12

REMOVAL AND INSTALLATION

...............................12

REMOVAL

...............................................................12

INSPECTION

...........................................................14

INSTALLATION

........................................................14

Thermostat.................................................................16

REMOVAL AND INSTALLATION

...............................16

INSPECTION

...........................................................16

Water Control Valve...................................................17

REMOVAL AND INSTALLATION

...............................17

INSPECTION

...........................................................18

Radiator .....................................................................19

REMOVAL AND INSTALLATION

...............................19

Cooling Fan (Crankshaft driven) ...............................20

REMOVAL AND INSTALLATION

...............................20

INSPECTION

...........................................................20

Refilling Engine Coolant ............................................20
Radiator (Aluminum type)..........................................21

PREPARATION

.......................................................21

DISASSEMBLY

........................................................21

ASSEMBLY

.............................................................22

INSPECTION

...........................................................23

Overheating Cause Analysis .....................................24
Service Data and Specifications (SDS).....................25

THERMOSTAT

........................................................25

WATER CONTROL VALVE

.......................................25

RADIATOR

..............................................................25

GI

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EC

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IDX

SEM164F

AEM080

Precautions

LIQUID GASKET APPLICATION PROCEDURE

NBLC0001

1.

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.)

I

For oil pan, be sure liquid gasket diameter is 4.0 to 5.0 mm
(0.157 to 0.197 in).

I

For 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 TOOLS

NBLC0002

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Tool number
(Kent-Moore No.)
Tool name

Description

ST25051001
(J25695-1)
Oil pressure gauge

NT050

ST25052000
(J25695-2)
Hose

NT559

Adapting oil pressure gauge to upper oil pan

WS39930000
(

—

)

Tube pressure

NT052

Pressing the tube of liquid gasket

ENGINE LUBRICATION SYSTEM

Precautions

LC-2

COMMERCIAL SERVICE TOOL

NBLC0040

Tool name

Description

Deep socket

NT818

Removing and installing oil pressure switch
Deep socket 26 mm, 3/8 drive

Lubrication Circuit

NBLC0003

SLC350BA

GI

MA

EM

EC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

ENGINE LUBRICATION SYSTEM

Preparation (Cont’d)

LC-3