Nissan Murano Z50 (2006 year). Manual — part 54
CO-1
ENGINE COOLING SYSTEM
B ENGINE
CONTENTS
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SECTION
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ENGINE COOLING SYSTEM
PRECAUTIONS . . . . . . . . . . . . . . .. 2
REMOVAL OF LIQUID GASKET SEALING . . .. 2
LIQUID GASKET APPLICATION PROCEDURE
PREPARATION . . . . . . . . . . . . . . ... 4
Special Service Tools . . . . . . . . . . . ... 4
Commercial Service Tools . . . . . . . . . . 4
OVERHEATING CAUSE ANALYSIS . . . . . . .. 5
Troubleshooting Chart . . . . . . . . . . . .. 5
COOLING SYSTEM . . . . . . . . . . . . . 7
Cooling Circuit . . . . . . . . . . . . . . .. 7
System Chart . . . . . . . . . . . . . . ... 8
ENGINE COOLANT . . . . . . . . . . . . . 9
Inspection . . . . . . . . . . . . . . . . . 9
LEVEL CHECK . . . . . . . . . . . . . . 9
LEAK CHECK . . . . . . . . . . . . . ... 9
Changing Engine Coolant . . . . . . . . . . 9
RADIATOR . . . . . . . . . . . . . . . . 13
Removal and Installation . . . . . . . . . . 13
Checking Radiator Cap . . . . . . . . . . .. 15
Checking Radiator . . . . . . . . . . . . .. 15
RADIATOR (ALUMINUM TYPE) . . . . . . . .. 16
Disassembly and Assembly . . . . . . . . ... 16
COOLING FAN . . . . . . . . . . . . . . .. 20
Removal and Installation . . . . . . . . . . 20
Disassembly and Assembly . . . . . . . . . 21
WATER PUMP . . . . . . . . . . . . . . .. 22
Removal and Installation . . . . . . . . . . 22
WATER INLET AND THERMOSTAT ASSEMBLY . 27
Removal and Installation . . . . . . . . . . 27
WATER OUTLET AND WATER PIPING . . . . ... 29
Removal and Installation . . . . . . . . . . 29
SERVICE DATA AND SPECIFICATIONS (SDS) . .. 31
CO-2
PRECAUTIONS
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PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NBS006SL
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
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
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:
●
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.
●
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.
●
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.
Precautions for Liquid Gasket
NBS002AE
REMOVAL OF LIQUID GASKET SEALING
●
After removing mounting bolts and nuts, separate the mating
surface using the seal cutter (SST) and remove old liquid gasket
sealing.
CAUTION:
Be careful not to damage the mating surfaces.
●
Tap seal cutter to insert it, and then slide it by tapping on the
side as shown in the figure.
●
In areas where seal cutter is difficult to use, use a plastic ham-
mer to lightly tap the parts, to remove it.
CAUTION:
If for some unavoidable reason tool such as a screwdriver
is used, be careful not to damage the mating surfaces.
LIQUID GASKET APPLICATION PROCEDURE
1.
Using a scraper, remove old liquid gasket adhering to the liquid
gasket application surface and the mating surface.
●
Remove liquid gasket completely from the groove of the liquid
gasket application surface, mounting bolts, and bolt holes.
2.
Wipe the liquid gasket application surface and the mating sur-
face with white gasoline (lighting and heating use) to remove
adhering moisture, grease and foreign materials.
PBIC0002E
PBIC0003E
PRECAUTIONS
CO-3
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3.
Attach liquid gasket tube to the tube presser [SST: WS39930000
(
—
)].
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-47, "RECOMMENDED CHEMICAL PRODUCTS AND
SEALANTS"
.
4.
Apply liquid gasket without breaks to the specified location with
the specified dimensions.
●
If there is a groove for the liquid gasket application, apply liq-
uid gasket to the groove.
●
As for the bolt holes, normally apply liquid gasket inside the
holes. Occasionally, it should be applied outside the holes.
Make sure to read the text of service manual.
●
Within five minutes of liquid gasket application, install the mat-
ing component.
●
If liquid gasket protrudes, wipe it off immediately.
●
Do not retighten after the installation.
●
After 30 minutes or more have passed from the installation, fill
engine oil and engine coolant.
CAUTION:
If there are specific instructions in this manual, observe them.
EMA0622D
SEM159F
CO-4
PREPARATION
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PREPARATION
PFP:00002
Special Service Tools
NBS002AF
The actual shapes of Kent-Moore tools may from those of special service tools illustrated here.
Commercial Service Tools
NBS002AG
Tool number
(Kent-Moore No.)
Tool name
Description
EG17650301
(J33984-A)
Radiator cap tester adapter
Adapting radiator cap tester to radiator cap
and radiator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV99103510
(
—
)
Radiator plate pliers A
Installing radiator upper and lower tanks
KV99103520
(
—
)
Radiator plate pliers B
Removing radiator upper and lower tanks
WS39930000
(
—
)
Tube pressure
Pressing the tube of liquid gasket
S-NT564
S-NT224
S-NT225
S-NT052
Tool name
Description
Power tool
Loosening nuts and bolts
Radiator cap tester
Checking radiator and radiator cap
PBIC0190E
PBIC1982E
OVERHEATING CAUSE ANALYSIS
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OVERHEATING CAUSE ANALYSIS
PFP:00012
Troubleshooting Chart
NBS002AH
Symptom
Check items
Cooling sys-
tem parts
malfunction
Poor heat transfer
Water pump malfunction
Worn or loose drive belt
—
Thermostat stuck closed
—
Damaged fins
Dust contamination or
paper clogging
Physical damage
Clogged radiator cooling
tube
Excess foreign material
(rust, dirt, sand, etc.)
Reduced air flow
Cooling fan does not oper-
ate
Fan assembly
—
High resistance to fan rota-
tion
Damaged fan blades
Damaged radiator shroud
—
—
—
Improper engine coolant
mixture ratio
—
—
—
Poor engine coolant quality
—
Engine coolant viscosity
—
Insufficient engine coolant
Engine coolant leaks
Cooling hose
Loose clamp
Cracked hose
Water pump
Poor sealing
Radiator cap
Loose
Poor sealing
Radiator
O-ring for damage, deterio-
ration or improper fitting
Cracked radiator tank
Cracked radiator core
Reservoir tank
Cracked reservoir tank
Overflowing reservoir tank
Exhaust gas leaks into
cooling system
Cylinder head deterioration
Cylinder head gasket dete-
rioration
CO-6
OVERHEATING CAUSE ANALYSIS
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Except cool-
ing system
parts mal-
function
—
Overload on engine
Abusive driving
High engine rpm under no
load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system mal-
function
—
Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flow
Blocked bumper
—
—
Blocked radiator grille
Installed car brassiere
Mud contamination or
paper clogging
Blocked radiator
—
Blocked condenser
Blocked air flow
Installed large fog lamp
Symptom
Check items
COOLING SYSTEM
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COOLING SYSTEM
PFP:21020
Cooling Circuit
NBS002AI
PBIC2692E
CO-8
COOLING SYSTEM
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System Chart
NBS002AJ
PBIC2693E
ENGINE COOLANT
CO-9
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ENGINE COOLANT
PFP:KQ100
Inspection
NBS002AK
LEVEL CHECK
●
Check if the reservoir tank engine coolant level is within the
“MIN” to “MAX” range when the engine is cool.
●
Adjust the coolant level as necessary.
LEAK CHECK
●
To check for leaks, apply pressure to the cooling system with the
radiator cap tester (commercial service tool) and the radiator
cap tester adapter (SST).
WARNING:
Do not remove radiator cap when the engine is hot. Serious
burns could occur from high pressure engine coolant
escaping from the radiator.
CAUTION:
Higher testing pressure than specified may cause radiator
damage.
NOTE:
In case that engine coolant decreases, replenish radiator with engine coolant.
●
If anything is found, repair or replace damaged parts.
Changing Engine Coolant
NBS002AL
WARNING:
●
To avoid being scalded, do not change engine coolant when the engine is hot.
●
Wrap a thick cloth around radiator cap and carefully remove radiator cap. First, turn radiator cap a
quarter of a turn to release built-up pressure. Then turn radiator cap all the way.
CAUTION:
Be careful not to allow engine coolant to contact drive belts.
DRAINING ENGINE COOLANT
1.
Remove radiator drain hole cap on undercover.
2.
Open radiator drain plug at the bottom of radiator, and then
remove radiator cap.
SMA412B
Testing pressure
: 157 kPa (1.6 kg/cm
2
, 23 psi)
SLC756A
PBIC1204E
CO-10
ENGINE COOLANT
Revision: 2006 August
2006 Murano
When draining all of engine coolant in the system, open water drain plugs on cylinder block. Refer
to
3.
Remove reservoir tank as necessary, and drain engine coolant and clean reservoir tank before installing.
4.
Check drained engine coolant for contaminants such as rust, corrosion or discoloration.
If contaminated, flush the engine cooling system. Refer to
CO-11, "FLUSHING COOLING SYSTEM"
.
REFILLING ENGINE COOLANT
NOTE:
When engine coolant is drained from radiator only, step 3, 4 and 6 are unnecessary.
1.
Install reservoir tank if removed, and radiator drain plug.
CAUTION:
Be sure to clean drain plug and install with new O-ring.
If water drain plug on cylinder block are removed, close and tighten them. Refer to
2.
Make sure that each hose clamp has been firmly tightened.
3.
Remove air duct assembly. Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
4.
Disconnect heater hose (right side of vehicle) at the position in
the figure.
●
Enhance heater hose as high as possible.
5.
Fill radiator, and reservoir tank if removed, to specified level.
●
Pour engine coolant through engine coolant filler neck
slowly of less than 2 (2-1/8 US qt, 1-3/4 lmp qt) a minute
to allow air in system to escape.
●
Use Genuine NISSAN Long Life Antifreeze/Coolant or
equivalent mixed with water (distilled or demineralized).
Refer to
MA-10, "RECOMMENDED FLUIDS AND LUBRI-
PBIC1205E
Radiator drain plug:
: 0.78 - 1.56 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
PBIC2847E
Engine coolant capacity
(With reservoir tank at “MAX” level)
: Approximately 9.6
(10-1/8 US qt, 8-1/2 lmp qt)
SMA182B
ENGINE COOLANT
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●
When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant, if heater hose is disconnected.
6.
Install air duct assembly. Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
7.
Install radiator cap.
8.
Warm up until opening thermostat. Standard for warming-up time is approximately 10 minutes at 3,000
rpm.
●
Make sure thermostat opening condition by touching radiator hose (lower) to see a flow of warm water.
CAUTION:
Watch water temperature gauge so as not to overheat engine.
9.
Stop the engine and cool down to less than approximately 50
°
C (122
°
F).
●
Cool down using fan to reduce the time.
●
If necessary, refill radiator up to filler neck with engine coolant.
10. Refill reservoir tank to “MAX” level line with engine coolant.
11. Repeat steps 5 through 9 two or more times with radiator cap installed until engine coolant level no longer
drops.
12. Check cooling system for leaks with engine running.
13. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to
3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
●
Sound may be noticeable at heater unit.
14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 5 through 9 until engine coolant level no
longer drops.
FLUSHING COOLING SYSTEM
NOTE:
When engine coolant is drained from radiator only, step 2, 3 and 5 are unnecessary.
1.
Install reservoir tank if removed, and radiator drain plug.
If water drain plug on cylinder block are removed, close and tighten them. Refer to
2.
Remove air duct assembly. Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
.
3.
Disconnect heater hose (right side of vehicle) at the position in
the figure.
●
Enhance heater hose as high as possible.
Reservoir tank engine coolant capacity
(At “MAX” level)
: 0.8 (7/8 US qt, 3/4 lmp qt)
SMA412B
Radiator drain plug:
: 0.78 - 1.56 N·m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
PBIC2847E
CO-12
ENGINE COOLANT
Revision: 2006 August
2006 Murano
4.
Fill radiator and reservoir tank with water and install radiator cap.
●
When engine coolant overflows disconnected heater hose, connect heater hose, and continue filling the
engine coolant, if heater hose is disconnected.
5.
Install air duct assembly. Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
.
6.
Run the engine and warm it up to normal operating temperature.
7.
Rev the engine two or three times under no-load.
8.
Stop the engine and wait until it cools down.
9.
Drain water from the system. Refer to
CO-9, "DRAINING ENGINE COOLANT"
.
10. Repeat steps 1 through 9 until clear water begins to drain from radiator.
RADIATOR
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RADIATOR
PFP:21400
Removal and Installation
NBS002AM
●
Refer to
for symbol marks in the figure.
WARNING:
Do not remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine
coolant escaping from radiator. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to
release built-up pressure. Carefully remove radiator cap by turning it all the way.
REMOVAL
1.
Remove undercover.
2.
Drain engine coolant. Refer to
CO-9, "Changing Engine Coolant"
.
CAUTION:
●
Perform this step when the engine is cold.
●
Do not spill engine coolant on drive belts.
3.
Remove air duct (inlet) and radiator cover grills (right and left sides). Refer to
4.
Disconnect harness connector from fan motors, and move harness to aside.
5.
Disconnect CVT fluid cooler hoses.
●
Install plug to avoid leakage of CVT fluid.
1.
Bracket
2.
Reservoir tank cap
3.
Reservoir tank
4.
Bracket
5.
Clamp
6.
Reservoir tank hose
7.
Radiator upper clip
8.
Mounting rubber
9.
Radiator cap
10. Radiator
11.
Mounting rubber
12. Clamp
13. CVT fluid cooler hose
14. Clamp
15. Radiator hose (upper)
16. CVT fluid cooler hose
17. O-ring
18. Drain plug
19. Radiator hose (lower)
20. Radiator cooling fan assembly
A.
To water inlet
B.
To water outlet
C.
Vehicle front
PBIC4886E
CO-14
RADIATOR
Revision: 2006 August
2006 Murano
6.
Remove radiator hoses (upper and lower) and reservoir tank hose.
CAUTION:
Be careful not to allow engine coolant to contact drive belts.
7.
Remove reservoir tank and bracket.
8.
Remove battery and battery tray, and move fuse and fusible link block to aside. Refer to
9.
Remove radiator upper clips by pulling the tabs outside to
release the lock.
Do not pull the tabs outside excessively to prevent it from
damaging.
10. Remove mounting rubbers (upper) from mounting pins on radiator.
11. Lift up and remove radiator and radiator cooling fan assembly.
CAUTION:
Do not damage or scratch A/C condenser and radiator core when removing.
12. Remove radiator cooling fan assembly from radiator.
INSTALLATION
Note the following, and install in the reverse order of removal.
Radiator Upper Clip
Install radiator upper clip on radiator core connection as follows:
1.
Install mounting rubbers (upper) on mounting pins of radiator.
2.
Align radiator upper clip with radiator core connection, then insert radiator upper clip straight into radiator
core connections until a click is heard.
3.
After connecting radiator upper clip, use the following method to make sure it is fully connected.
●
Visually confirm that two radiator upper clips are connected to radiator core connections.
●
Move radiator upper clip and the radiator forward and backward to make sure they are securely con-
nected.
INSPECTION AFTER INSTALLATION
●
Check for leaks of engine coolant using the radiator cap tester adapter [SST: EG17650301 (J33984-A)]
and the radiator cap tester (commercial service tool). Refer to
.
●
Start and warm up the engine. Visually make sure that there is no leaks of engine coolant and CVT fluid.
PBIC1216E
PBIC1241E
RADIATOR
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Checking Radiator Cap
NBS002AN
●
Check valve seat of radiator cap.
–
Check if valve seat is swollen to the extent that the edge of the
plunger cannot be seen when watching it vertically from the top.
–
Check if valve seat has no soil and damage.
●
Pull negative-pressure valve to open it, and make sure that it
close completely when released.
–
Make sure that there is no dirt or damage on the valve seat of
radiator cap negative-pressure valve.
–
Make sure that there are no unusualness in the opening and
closing conditions of negative-pressure valve.
●
Check radiator cap relief pressure.
–
When connecting radiator cap to the radiator cap tester adapter
(SST) and the radiator cap tester (commercial service tool),
apply engine coolant to the cap seal surface.
●
Replace radiator cap if there is an unusualness related to the above three.
CAUTION:
When installing radiator cap, thoroughly wipe out the radiator filler neck to remove any waxy residue
or foreign material.
Checking Radiator
NBS002AO
Check radiator for mud or clogging. If necessary, clean radiator as follows.
●
Be careful not to bend or damage radiator fins.
●
When radiator is cleaned without removal, remove all surrounding parts such as cooling fan, radiator
shroud and horns. Then tape harness and 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 if any stains no longer flow out from radiator.
4.
Blow air into the back side of radiator core vertically downward.
●
Use 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.
PBIC2816E
SMA967B
Standard:
78 - 98 kPa (0.8 - 1.0 kg/cm
2
, 11 - 14 psi)
Limit:
59 kPa (0.6 kg/cm
2
, 9 psi)
SLC755A
CO-16
RADIATOR (ALUMINUM TYPE)
Revision: 2006 August
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RADIATOR (ALUMINUM TYPE)
PFP:21460
Disassembly and Assembly
NBS002AP
PREPARATION
1.
Attach spacer to tip of the radiator plate pliers A (SST).
Spacer specification: 18 mm (0.71 in) wide
×
8.5 mm (0.335 in)
long
×
1.5 mm (0.059 in) thick.
2.
Make sure that when the radiator plate pliers A [SST: KV99103510 (
—
)] are closed dimension H
′′
is
approx. 7.6 mm (0.299 in).
3.
Adjust dimension H
′′
with spacer, if necessary.
DISASSEMBLY
1.
Remove upper and lower tanks with the radiator plate pliers B
(SST).
CAUTION:
Do not disassemble lower tank and CVT fluid cooler.
NOTE:
Regard lower tank and CVT fluid cooler as an assembly.
1.
Upper tank
2.
Sealing rubber
3.
Core
4.
Lower tank (with CVT fluid cooler)
PBIC2539E
SLC655CB
SLC903-A
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