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B ENGINE

CO
SECTION
ENGINE COOLING SYSTEM C

E
CONTENTS
KA24DE VG33E and VG33ER F

PRECAUTIONS ......................................................... 3 . PRECAUTIONS ....................................................... 18 .
Precautions for Supplemental Restraint System Precautions for Supplemental Restraint System
G
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- (SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ................................................................. 3
. SIONER" ................................................................ 18
.
Precautions for Liquid Gasket ................................. 3 . Precautions for Liquid Gasket ............................... 18 .
REMOVAL OF LIQUID GASKET ......................... 3 . REMOVAL OF LIQUID GASKET ........................ 18 . H
LIQUID GASKET APPLICATION PROCEDURE 3 ..... Precautions for Liquid Gasket ............................... 18 .
PREPARATION .......................................................... 5. REMOVAL OF LIQUID GASKET ........................ 18 .
Special Service Tools .............................................. 5 . LIQUID GASKET APPLICATION PROCEDURE 19 ... I
OVERHEATING CAUSE ANALYSIS ......................... 6 . PREPARATION ........................................................ 20 .
Troubleshooting Chart ............................................. 6 . Special Service Tools ............................................ 20 .
COOLING SYSTEM ................................................... 7 . OVERHEATING CAUSE ANALYSIS ....................... 21 . J
Cooling Circuit ......................................................... 7
. Troubleshooting Chart ........................................... 21 .
ENGINE COOLANT ................................................... 8 . COOLING SYSTEM ................................................. 22 .
System Check ......................................................... 8
. Cooling Circuit ....................................................... 22
.
CHECKING COOLING SYSTEM HOSES ........... 8 . ENGINE COOLANT ................................................. 23 . K
CHECKING RADIATOR ....................................... 8 . System Check ....................................................... 23.
CHECKING COOLING SYSTEM FOR LEAKS..... 8 CHECKING COOLING SYSTEM HOSES .......... 23 .
CHECKING RADIATOR CAP ............................... 8 . CHECKING RADIATOR ..................................... 23 . L
Refilling Engine Coolant .......................................... 9 . CHECKING COOLING SYSTEM FOR LEAKS ... 23
WATER PUMP ......................................................... 10 . CHECKING RADIATOR CAP ............................. 23 .
Removal ................................................................ 10
. Refilling Engine Coolant ........................................ 24 . M
Inspection ...............................................................11
. WATER PUMP ......................................................... 25 .
Installation ..............................................................11
. Removal ................................................................ 25
.
THERMOSTAT ......................................................... 13 . Inspection .............................................................. 26
.
Removal ................................................................ 13
. Installation ............................................................. 26
.
Inspection .............................................................. 13
. THERMOSTAT ......................................................... 28 .
Installation ............................................................. 13
. Removal ................................................................ 28
.
RADIATOR ............................................................... 14
. Inspection .............................................................. 28
.
Components .......................................................... 14
. Installation ............................................................. 29
.
Removal and Installation ....................................... 14 . RADIATOR ............................................................... 30
.
Inspection .............................................................. 15
. Components .......................................................... 30
.
COOLING FAN (CRANKSHAFT DRIVEN) ............. 16 . Removal and Installation ....................................... 30 .
Removal and Installation ....................................... 16 . Inspection .............................................................. 31
.
Inspection .............................................................. 16
. COOLING FAN (CRANKSHAFT DRIVEN) .............. 32 .
SERVICE DATA AND SPECIFICATIONS (SDS) ..... 17 . Removal and Installation ....................................... 32 .
Thermostat ............................................................ 17
. Inspection .............................................................. 32
.
Radiator ................................................................. 17
.

CO-1
SERVICE DATA AND SPECIFICATIONS (SDS) ..... 33 .
Thermostat ............................................................. 33
.
Radiator ................................................................. 33
.

CO-2
PRECAUTIONS
[KA24DE]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EBS00F13

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along CO
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING: D
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. E
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
G
Precautions for Liquid Gasket EBS00EZY

REMOVAL OF LIQUID GASKET
q After removing the mounting bolts and nuts, separate the mating H
surface using a seal cutter and remove the sealant.
CAUTION:
Be careful not to damage the mating surfaces. I
q In areas where the cutter is difficult to use, use a plastic hammer
to lightly tap the areas where the sealant is applied.
CAUTION: J
If for some unavoidable reason a tool such as a flat-bladed
screwdriver is used, be careful not to damage the mating sur-
faces.
PBIC0002E K
LIQUID GASKET APPLICATION PROCEDURE
1. Using a scraper, remove the old sealant adhering to the mating
L
surface.
q Remove the sealant completely from the groove, mounting
bolts, and bolt holes.
M
2. Clean the mating surface thoroughly to remove adhering mois-
ture, grease and foreign materials.
3. Install the sealant tube into the tube presser.
Use Genuine Silicone RTV or equivalent. Refer to GI-42,
"Recommended Chemical Products and Sealants" .
PBIC0003E

CO-3
PRECAUTIONS
[KA24DE]
4. Apply the sealant without breaks to the specified area with the
specified dimensions.
q If there is a groove for the sealant application, apply the seal-
ant to the groove.

EMA0622D

q As for the bolt holes, normally apply the sealant inside the
holes. If specified, it should be applied outside the holes.
Make sure to read the instructions in this manual.
q Within five minutes of sealant application, install the mating
component.
q If the sealant protrudes, wipe it off immediately.

q Do not retighten after the installation.

q After 30 minutes or more have passed from the installation, fill
the engine with the correct oil and coolant. Refer to MA-12,
"Recommended Fluids and Lubricants" . SEM159F
CAUTION:
If there are specific instructions in the service manual, observe them.

CO-4
PREPARATION
[KA24DE]
PREPARATION PFP:00002
A
Special Service Tools EBS00EZZ

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number Description
CO
(Kent-Moore No.)
Tool name
EG17650301 Adapting radiator cap tester to radiator filler
(J33984-A) neck C
Radiator cap tester adapter a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in) D

NT564

WS39930000 Pressing the tube of liquid gasket E
( -- )
Tube presser

NT052
G

CO-5
OVERHEATING CAUSE ANALYSIS
[KA24DE]
OVERHEATING CAUSE ANALYSIS PFP:00012

Troubleshooting Chart EBS00GJG

Symptom Check items
Water pump malfunction Worn or loose drive belt
Thermostat stuck closed Coolant circulation
Dust contamination or rock
Poor heat transfer Damaged fins clogging --
Mechanical damage
Clogged radiator cooling Excess foreign material
tube (rust, dirt, sand, etc.)
Fan coupling does not
operate
Reduced air flow High resistance to fan rota- Fan and coupling --
tion
Damaged fan blades
Damaged radiator shroud -- -- --
Improper coolant mixture
Cooling sys- -- -- --
ratio
tem parts
malfunction Poor coolant quality -- Periodic maintenance --
Loose clamp
Cooling hose
Cracked hose
Water pump Poor sealing
Loose
Radiator cap
Poor sealing
Coolant leaks
O-ring for damage, deterio-
Insufficient coolant ration or improper fitting
Radiator
Cracked radiator tank
Cracked radiator core
Reservoir tank Cracked reservoir tank
Cylinder head deterioration
Exhaust gas leaks into
Overflowing reservoir tank Cylinder head gasket dete-
cooling system
rioration
High engine rpm under no
load
Driving in low gear for
Abusive driving
extended time
Driving at extremely high
speed
-- Overload on engine
Powertrain system mal-
function
Except cool-
ing system Installed improper size
wheels and tires --
parts mal-
function Dragging brakes
Improper ignition timing
Blocked radiator grille Installed car brassiere
Blocked bumper
Blocked or restricted air
Blocked radiator Mud contamination or --
flow
Blocked condenser paper clogging

Installed large fog lamp

CO-6
COOLING SYSTEM
[KA24DE]
COOLING SYSTEM PFP:21020
A
Cooling Circuit EBS00F01

ALC117
K

CO-7
ENGINE COOLANT
[KA24DE]
ENGINE COOLANT PFP:KQ100

System Check EBS00F02

WARNING:
q Never remove the radiator cap when the engine is hot. Serious burns could occur from high pres-
sure coolant escaping from the radiator.
q Wrap a thick cloth around the radiator cap. Slowly turn it a quarter turn to allow built-up pressure
to escape. Carefully remove the radiator cap by turning it all the way.
CHECKING COOLING SYSTEM HOSES
q Check hoses for improper attachment, leaks, cracks, damage, chafing and deterioration.
CHECKING RADIATOR
Check radiator for mud or clogging. If necessary, clean radiator as follows:
CAUTION:
q Be careful not to bend or damage the radiator fins.
q When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radi-
ator shroud and horns.
q Tape the harness connectors to prevent water from entering.
1. Apply water by hose to the back side of the radiator core vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing when water flows clear coming out of the radiator.
4. Blow air into the back side of radiator core vertically downward.
q Use compressed air lower than 490 kPa (5 kg/cm2 , 71 psi) and keep the air hose end more than 30 cm
(11.8 in) away from the core.
5. Blow air again into all the radiator core surfaces once per minute until no water blows out and the core is
dry.
CHECKING COOLING SYSTEM FOR LEAKS
q To check for leakage, apply pressure to the cooling system with
a radiator cap tester.
CAUTION:
Higher pressure than specified may cause radiator damage.
Testing pressure : 157 kPa (1.6 kg/cm2 , 23 psi)

SLC756A

CHECKING RADIATOR CAP
q To check radiator cap, apply pressure to radiator cap with a radi-
ator cap tester.
Radiator cap relief pressure
Standard : 78 - 98 kPa (0.8 - 1.0 kg/cm2 , 11 - 14 psi)
Limit : 59 kPa (0.6 kg/cm2 , 9 psi)

SLC755A

CO-8
ENGINE COOLANT
[KA24DE]
q Pull the negative pressure valve to open it.
Check that it closes completely when released. A

SMA967B

D
Refilling Engine Coolant EBS00F03

For details on refilling the engine cooling system, refer to MA-17, "REFILLING ENGINE COOLANT" .
E

CO-9
WATER PUMP
[KA24DE]
WATER PUMP PFP:21020

Removal EBS00F04

WBIA0446E

1. Water inlet 2. Thermostat 3. Water pump
4. Water pump pulley 5. Fan coupling 6. Fan

CAUTION:
q When removing water pump assembly, be careful not to get coolant on drive belts.
q Water pump cannot be disassembled and should be replaced as a unit.
q After installing water pump, connect hose and clamp securely. Check for leaks using radiator cap
tester.
1. Drain coolant from engine.
Refer to MA-16, "DRAINING ENGINE COOLANT" .
2. Remove fan coupling with fan.
3. Remove power steering pump drive belt, generator drive belt, and A/C compressor drive belt.
4. Remove water pump pulley.
5. Remove water pump.

CO-10
WATER PUMP
[KA24DE]
Inspection EBS00F05

A
q Check body assembly for rust or corrosion.
q Check for rough operation due to excessive end play.
CO

D
SLC738

Installation EBS00F06

1. Use a scraper to remove liquid gasket from water pump. E
q Also remove traces of liquid gasket from mating surface
of cylinder block.
F

H
SLC188A

2. Apply a continuous bead of liquid gasket to mating surface of
water pump. I
q Use Genuine Anaerobic Liquid Gasket or equivalent.
Refer to GI-42, "Recommended Chemical Products and
Sealants" . J

ALC078

L
3. Install water pump. Tighten water pump bolts to specification as
shown.
M

ALC077

4. Install water pump pulley.
5. Install power steering pump drive belt, generator drive belt, and A/C compressor drive belt. Refer to MA-
15, "Checking Drive Belts" .

CO-11
WATER PUMP
[KA24DE]
6. Install fan with fan coupling.
7. Refill engine cooling system. Refer to MA-17, "REFILLING
ENGINE COOLANT" .

WBIA0444E

CO-12
THERMOSTAT
[KA24DE]
THERMOSTAT PFP:21200
A
Removal EBS00F07

q Be careful not to spill coolant over engine compartment.
Use a rag to absorb coolant. CO
1. Drain coolant from engine. Refer to MA-16, "DRAINING
ENGINE COOLANT" .
2. Remove air cleaner and air duct assembly. C
3. Remove water hose from water inlet housing.
4. Remove water inlet housing, then take out thermostat.
D

ALC087

E
Inspection EBS00F08

1. Check valve seating condition at normal room temperature. It
should seat tightly.
F
2. Check valve opening temperature and valve lift.
Valve opening temperature 76.5

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