2011 INFINITI QX56 engine

CO-10
< PERIODIC MAINTENANCE >
ENGINE COOLANT
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 if necessary.
11. Repeat steps 6 through 10 two or more times with reservoir tank cap installed until engine coolant level no longer drops.
12. Check cooling system for leakage 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 4, and steps from 6 to 14 until engine
coolant level no longer drops.
FlushingINFOID:0000000006289660
1. Install reservoir tank if removed, and radiator drain plug. CAUTION:
Be sure to clean drain plug and install with new O-ring. Refer to CO-13, "
Exploded View".
If water drain plug on cylinder block is removed, close and tighten it. Refer to EM-107, "
Disassem-
bly and Assembly".
2. Remove air relief plug (1) on heater hose.
3. Fill radiator and reservoir tank with water until water spills from the air relief holes, then close air relief
plugs with clamp. Fill radiator and reservoir tank with water and reinstall caps.
4. Run the engine and warm it up to normal operating temperature.
5. Rev the engine two or three times under no-load.
6. Stop the engine and wait until it cools down.
7. Drain water from the system. Refer to CO-8, "
Draining".
8. Repeat steps 1 through 7 until clear water begins to drain from radiator. : 1.96 N·m (0.2 kg-m, 17 in-lb)
2. Engine cover
: Vehicle front
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Revision: 2010 May2011 QX56

RADIATORCO-11
< PERIODIC MAINTENANCE >
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RADIATOR
RESERVOIR TANK CAP
RESERVOIR TANK CAP : InspectionINFOID:0000000006289661
 Check valve seat of reservoir tank cap.
- Check if valve seat (A) is swollen to the extent that the edge of the
metal plunger (B) 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 check that it close completely when released.
- Check that there is no dirt or dam age on the valve seat of reservoir
tank cap negative-pressure valve.
- Check that there are no unusualness in the opening and closing conditions of negative-pressure valve.
 Check reservoir tank cap relief pressure.
- When connecting reservoir tank cap to the radiator cap tester (commercial service tool) and the r adiator cap tester adapter (com-
mercial service tool) (A), apply engine coolant to the cap seal sur-
face.
 Replace reservoir tank cap if there is an unusualness related to the above three.
CAUTION:
When installing reservoir tank cap , thoroughly wipe out the water inlet filler neck to remove any waxy
residue or foreign material.
RADIATOR
RADIATOR : InspectionINFOID:0000000006289662
Check radiator for mud or clogging. If neces sary, clean radiator as per the following:
 Be careful not to bend or damage radiator fins.
 When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan shroud. 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.
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SMA967B
Standard and limit : Refer to CO-23, "Radiator".
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Revision: 2010 May2011 QX56

RADIATORCO-13
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
RADIATOR
Exploded ViewINFOID:0000000006289663
Removal and InstallationINFOID:0000000006289664
REMOVAL
WARNING:
Never remove radiator cap when en
gine is hot. Serious burns could occur from high-pressure engine
coolant escaping from water inlet. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn
1. Radiator cap 2. Radiator 3. Mounting rubber (upper)
4. Mounting rubber (lower) 5. Clamp 6. Radiator hose (lower)
7. O-ring 8. Drain plug 9. Fan shroud (lower)
10. Fan shroud (upper) 11. Radiator hose (upper) 12. Mounting rubber (lower)
13. Reservoir tank hose 14. Reservoir tank 15. Reservoir tank hose
16. Clamp 17. Reservoir tank cap
A. To radiator B. To water outlet C. To water inlet
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56

CO-14
< REMOVAL AND INSTALLATION >
RADIATOR
to release built-up pressure. Carefully remove radiator cap by turning it all the way. Note that the reser-
voir tank cap side is also under pressure.
1. Remove front under cover with power tool. Refer to EXT-25, "
Exploded View".
2. Remove engine cover. Refer to EM-25, "
Exploded View".
3. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
CAUTION:
 Perform this step when the engine is cold.
 Never spill engine coolant on drive belts.
4. Remove radiator hose (lower).
5. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
6. Move reservoir tank to the position without the hindrance for work.
7. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
8. Remove fan shroud (upper), refer to following.
a. Remove EVAP hose mounting bolts and move harness to aside.
b. Move air cleaner case to the position without the hindrance for work. Refer to EM-27, "
Exploded View".
NOTE:
The air cleaner case connector is not required to be disconnected.
9. Remove radiator grille. Refer to EXT-19, "
Exploded View".
10. Move condenser to the position without the hindranc e for work with the following procedures. Refer to HA-
38, "Exploded View".
 Remove mounting bolts and disconnect A/C piping from radiator.
 Remove air guide from radiator. Refer to EXT-12, "
Exploded View".
 Remove radiator mounting bolts.
11. Remove radiator hose (upper).
12. Remove radiator as per the following: CAUTION:
Be careful not to damage radiator core.
 Lift up and pull the radiator (1) forward, and then remove themounting rubber (lower) (3) from the radiator core support (2).
INSTALLATION
Note the following, and install in the reverse order of removal.
CAUTION:
 Use genuine mounting bolts for th e cooling fan assembly and strictly observe the tightening torque.
(Breakage prevention for radiator)
NOTE:
 Insert the radiator hose (1) all the way to the st opper (2) or by 33 mm (1.30 in) (hose without a stopper).
: Vehicle front
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Revision: 2010 May2011 QX56

RADIATORCO-15
< REMOVAL AND INSTALLATION >
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 For the orientation of the hose clamp pawl, refer to the figure.
*Refer to the illustrations for the specific position each hose clamp tab.
 The angle (b) created by the hose clamp pawl and the specified
line (A) must be within ±15 ° as shown in the figure.
 To install hose clamps (1), check that the dimension (A) from the end of the paint mark (2) on the radiator hose to the hose clamp is
within the reference value.
InspectionINFOID:0000000006289665
INSPECTION AFTER INSTALLATION
 Check for leakage of engine coolant using the radiator cap tester adapter (commercial service tool) and the
radiator cap tester (commercial service tool). Refer to CO-8, "
Inspection".
 Start and warm up the engine. Visually check that there is no leakage of engine coolant.
Unit mm (in)
A. Radiator side B. Engine side
Radiator hose Hose end Paint mark Position of hose clamp*
Radiator hose (upper) Radiator side Upper A
Engine side Upper B
Radiator hose (lower) Radiator side Lower C
Engine side Left side D
E. View E f. 45 °
: Vehicle upper : Vehicle front
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Dimension “A” ( −1) – (+1) mm
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Revision: 2010 May2011 QX56

CO-16
< REMOVAL AND INSTALLATION >
COOLING FAN
COOLING FAN
Exploded ViewINFOID:0000000006289666
Removal and InstallationINFOID:0000000006289667
REMOVAL
1. Remove front under cover with power tool. Refer to EXT-25, "Exploded View".
2. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
3. Move reservoir tank to the position without the hindrance for work, refer to following.
 Remove fixed bolts
 Remove reservoir tank hose clamp.
4. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
5. Remove fan shroud (upper), refer to following.  Remove EVAP hose.
 Remove fan shroud (upper) mounting bolts. Refer to CO-13, "
Exploded View".
 Move air cleaner to the position without the hindrance for work.
 Remove engine cover. Refer to EM-25, "
Exploded View".
6. Remove cooling fan.
7. Remove drive belt. Refer to EM-20, "
Exploded View".
8. Disconnect fan coupling harness connector.
9. Remove fan coupling.
10. Remove bracket.
11. Remove cooling fan pulley.
12. Remove Idler pulley.
1. Fan bracket 2. Cooling fan pulley 3. Fan coupling
4. Bracket 5. Cooling fan
Refer to GI-4, "
Components" for symbols not described on the above.
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Revision: 2010 May2011 QX56

COOLING FANCO-17
< REMOVAL AND INSTALLATION >
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13. Remove the fan bracket, refer to following.
 Disconnect A/C compressor harness connector. Refer to HA-30, "
Exploded View".
 Remove A/C compressor mounting bolt. Refer to HA-30, "
Exploded View".
 Remove fan bracket mounting bolt.
INSTALLATION
Installation is in the reverse order of removal.
InspectionINFOID:0000000006289668
INSPECTION AFTER REMOVAL
Fan Coupling
Inspect fan coupling for oil leakage and bimetal conditions.
Fan Bracket
 Visually check that there is no significant looseness in the fan bracket shaft, and that it turns smoothly by hand.
 If there are any unusual concerns, replace the cooling fan pulley.
INSPECTION AFTER INSTALLATION
 Check for leaks of the engine coolant. Refer to CO-8, "Inspection".
 Start and warm up the engine. Visually make sure that there are no leaks of the engine coolant.
SLC072
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Revision: 2010 May2011 QX56

CO-18
< REMOVAL AND INSTALLATION >
WATER PUMP
WATER PUMP
Exploded ViewINFOID:0000000006289669
Removal and InstallationINFOID:0000000006289670
CAUTION:
 When removing water pump assembly, be careful not to get engine coolant on drive belts.
 Water pump cannot be disassembled and should be replaced as a unit.
 After installing water pump, co nnect hose and clamp securely, then check for leakage using the radi-
ator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service
tool).
REMOVAL
1. Drain engine coolant from drain plugs on radiator and cylinder block. Refer to CO-8, "Draining" and EM-
103, "Setting".
CAUTION:
 Perform this step when engine is cold.
 Never spill engine coolant on drive belt.
2. Remove front under cover with power tool. Refer to EXT-25, "
Exploded View".
3. Remove fan shroud (lower). Refer to CO-13, "
Exploded View".
4. Move reservoir tank to the position with out the hindrance for work. Refer to CO-13, "
Exploded View".
5. Remove radiator core support cover. Refer to DLK-220, "
Exploded View".
6. Remove fan shroud (upper). Refer to CO-13, "
Exploded View".
7. Remove drive belt. Refer to EM-20, "
Exploded View".
8. Remove cooling fan, fan coupling, cooling fan pulley and bracket. Refer to CO-16, "
Exploded View"
9. Remove radiator hose (upper). Refer to CO-13, "Exploded View".
10. Remove water pump pulley.
1. Water pump pulley 2. Water pump 3. Gasket
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56