2011 INFINITI QX56 engine coolant

EM-1
ENGINE
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SECTION EM
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CONTENTS
ENGINE MECHANICAL
PRECAUTION ................ ...............................3
PRECAUTIONS .............................................. .....3
Precaution for Procedure without Cowl Top Cover ......3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
3
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .....................................
3
Precaution for Drain Engine Coolant and Engine
Oil ..............................................................................
4
Precaution for Disconnecting Fuel Piping .................4
Precaution for Handling High Pressure Fuel Sys-
tem ............................................................................
4
Precaution for Removal and Disassembly ................4
Precaution for Inspection, Repair and Replace-
ment ..........................................................................
4
Precaution for Assembly and Installation ..................4
Parts Requiring Angle Tightening .............................5
Precaution for Liquid Gasket .....................................5
Definitions of Bank Names ........................................6
PREPARATION ............................................7
PREPARATION .............................................. .....7
Special Service Tool ........................................... ......7
Commercial Service Tool ..........................................9
BASIC INSPECTION ...................................12
CAMSHAFT VALVE CLEARANCE ............... ....12
Inspection ............................................................ ....12
COMPRESSION PRESSURE ............................16
Inspection ............................................................ ....16
SYMPTOM DIAGNOSIS ..............................18
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ........................ ....
18
NVH Troubleshooting - Engine Noise .............. ....18
Use the Chart Below to Help You Find the C
ause of the Symptom ........................................ ....
19
PERIODIC MAINTENANCE ........................20
DRIVE BELTS ...................................................20
Exploded View ..................................................... ....20
Checking ..................................................................20
Tension Adjustment ................................................20
Removal and Installation .........................................20
Inspection ................................................................21
AIR CLEANER FILTER .....................................22
Exploded View .........................................................22
Removal and Installation .........................................22
SPARK PLUG ...................................................23
Exploded View .........................................................23
Removal and Installation .........................................23
Inspection ................................................................24
REMOVAL AND INSTALLATION ...............25
ENGINE COVER ...............................................25
Exploded View ..................................................... ....25
Removal and Installation .........................................25
DRIVE BELT AUTO TENSIONER AND IDLER
PULLEY .............................................................
26
Exploded View .........................................................26
Removal and Installation .........................................26
AIR CLEANER AND AIR DUCT .......................27
Exploded View .........................................................27
Removal and Installation .........................................27
Inspection ................................................................28
IGNITION COIL .................................................29
Exploded View .........................................................29
Removal and Installation .........................................29
INTAKE MANIFOLD .........................................30
Exploded View .........................................................30
Revision: 2010 May2011 QX56

EM-4
< PRECAUTION >
PRECAUTIONS
If turning the steering wheel is required with the battery disconnected or discharged, follow the operation pro-
cedure below before starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
2. Turn the push-button ignition switch to ACC position. (At this time, the steering lock will be released.)
3. Disconnect both battery cables. The steering lock wi ll remain released with both battery cables discon-
nected and the steering wheel can be turned.
4. Perform the necessary repair operation.
5. When the repair work is completed, re-connect bot h battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button igniti on switch is turned to LOCK position.)
6. Perform self-diagnosis check of all control units using CONSULT-III.
Precaution for Drain Engine Coolant and Engine OilINFOID:0000000006289509
Drain engine coolant and engine oil when engine is cooled.
Precaution for Disconnecting Fuel PipingINFOID:0000000006289510
 Before starting work, check no fire or sp ark producing items are in the work area.
 Release fuel pressure before disconnecting and disassembly.
 After disconnecting pipes, plug openings to stop fuel leakage.
Precaution for Handling High Pressure Fuel SystemINFOID:0000000006289511
 High pressure fuel system components are betw een high pressure fuel pump and fuel injector.
 Always release fuel pressure and never start the engine when performing removal and installation.
 When removing or installing parts without releasing fuel pressure, fuel may be splashed and, if fuel contacts
skin or eyes, it may cause inflammation.
Precaution for Removal and DisassemblyINFOID:0000000006289512
 When instructed to use SST, use specified tools. Always be careful to work safely, avoid forceful or unin-
structed operations.
 Exercise maximum care to avoid damage to mating or sliding surfaces.
 Cover openings of engine system with tape or the equival ent, if necessary, to seal out foreign materials.
 Mark and arrange disassembly parts in an organi zed way for easy troubleshooting and assembly.
 When loosening nuts and bolts, as a basic rule, star t with the one furthest outside, then the one diagonally
opposite, and so on. If the order of loosening is specified, do exactly as specified. Power tools may be used
where noted in the step.
Precaution for Inspection, Repair and ReplacementINFOID:0000000006289513
Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and
replace if necessary.
Precaution for Assembly and InstallationINFOID:0000000006289514
 Use torque wrench to tighten bolts or nuts to specification.
 When tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is specified,
do exactly as specified.
 Replace with new gasket, packing, oil seal or O-ring.
 Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for
any restriction and blockage.
 Dowel pins are used for several parts alignment. When replacing and reassembling parts with dowel pins,
check that dowel pins are installed in the original position.
Revision: 2010 May2011 QX56

PRECAUTIONSEM-5
< PRECAUTION >
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 Avoid damaging sliding or mating surfaces. Completely re
move foreign materials such as cloth lint or dust.
Before assembly, oil sliding surfaces well.
 Release air within route when refilling after draining engine coolant.
 After repairing, start engine and increase engine speed to check engine coolant, fuel, engine oil, and
exhaust gases for leakage.
Parts Requiring Angle TighteningINFOID:0000000006289515
 Use angle wrench [SST: KV10112100 (BT8653-A)] for the final tightening of the following engine parts:
- Cylinder head bolts
- Main bearing cap bolts
- Main bearing cap sub bolts
- Connecting rod cap bolts
- Crankshaft pulley bolt (No angle wrench is required as the bolt flange is provided with notches for angletightening)
 Ensure thread and seat surfaces are clean and coated with engine oil.
Precaution for Liquid GasketINFOID:0000000006289516
REMOVAL OF LIQUID GASKET SEALING
 After removing mounting nuts and bolts, separate the mating sur- face using the seal cutter [SST:KV10111100 (J-37228)] (A) and
remove old liquid gasket sealing.
CAUTION:
Be careful not to damage the mating surfaces.
 Tap the seal cutter to insert it (B), and then slide it (C) by tapping on the side as shown in the figure.
 In areas where the seal cutter is difficult to use, lightly tap the parts using a plastic hammer to remove it.
CAUTION:
If for some unavoidable reason a tool such as a screwdriver is
used, be careful not to damage the mating surfaces.
LIQUID GASKET APPLICATION PROCEDURE
1. Using a scraper (A), remove old liquid gasket adhering to the liq- uid gasket application surface and the mating surface.
 Remove liquid gasket completely from the groove of the liquidgasket 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.
3. Attach liquid gasket tube to the tube presser (commercial ser- vice tool).
Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
4. Apply liquid gasket without gaps to the specified location accord- ing to the specified dimensions.
 If there is a groove for liquid gasket application, apply liquidgasket to the groove.
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EMA0622D
Revision: 2010 May2011 QX56

EM-6
< PRECAUTION >
PRECAUTIONS
 As for bolt holes (B), normally apply liquid gasket inside theholes. Occasionally, it should be applied outside the holes.
Check to read the text of this manual.
 Within 5 minutes of liquid gasket application, install the mating component.
 If liquid gasket protrudes, wipe it off immediately.
 Do not retighten mounting bolts or nuts 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.
Definitions of Bank NamesINFOID:0000000006289517
 In this manual, each bank name is defined as per the following:
 For cylinder numbers and bank layout, refer to the figure.
A: Groove
: Inside
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A : Bank 2 (The conventional right bank)
B : Bank 1 (The conventional left bank)
: Engine front
Bank 1 : The bank side including cylinder No. 1 (odd-numbered cylinder side)
Bank 2 : The other bank side of the above (even-numbered cylinder side)
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Revision: 2010 May2011 QX56

DRIVE BELTSEM-21
< PERIODIC MAINTENANCE >
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2. Install wrench (A) on drive belt auto tensioner pulley bolt, move
in the direction of arrow (loosening direction of tensioner) as
shown.
CAUTION:
 Never place hand in a location where pinching may occurif the holding tool accidentally comes off.
 Never loosen the hexagonal part in center of auto ten- sioner pulley (1) (Never turn it clockwise). If turned clock-
wise, the complete auto tensioner must be replaced as a
unit, including the pulley.
3. Under the above condition, insert a metallic bar (B) of approxi- mately 6 mm (0.24 in) in diameter (hexagonal bar wrench shown
as example in the figure) through the holding boss to lock auto tensioner pulley arm.
4. Remove drive belt.
INSTALLATION
Note the following item, and install in the reverse order of removal.
CAUTION:
 Check drive belts are securely installed around all pulleys.
 Check drive belts are correctly engaged with the pulley groove.
 Check for engine oil and engine coolant ar e not adhered drive belts and pulley groove.
InspectionINFOID:0000000006289528
INSPECTION AFTER INSTALLATION
 Turn crankshaft pulley clockwise several times to equalize tension between each pulley, and then confirm
tension of drive belts at indicator (notch on fixed side) is within the possible use range. Refer to EM-20,
"Exploded View".
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Revision: 2010 May2011 QX56

EM-30
< REMOVAL AND INSTALLATION >
INTAKE MANIFOLD
INTAKE MANIFOLD
Exploded ViewINFOID:0000000006289543
Removal and InstallationINFOID:0000000006289544
REMOVAL
WARNING:
To avoid the danger of being scalded, never drain the engine coolant when the engine is hot.
1. Remove engine cover and bracket. Refer to EM-25, "
Exploded View".
2. Remove air cleaner case (upper) and air duct. Refer to EM-27, "
Exploded View".
3. Disconnect manifold absolute pressu re (MAP) sensor harness connector.
4. Remove EVAP canister purge control solenoid valve.
5. Disconnect PCV hoses from intake manifold.  Add matching marks as necessary for easier installation.
6. Drain engine coolant from radiator. Refer to CO-8, "
Draining".
CAUTION:
 Perform this step when the engine is cold.
1. Intake manifold 2. PCV hose 3. Clamp
4. EVAP canister purge control sole-
noid valve 5. Clamp 6. EVAP hose
7. Gasket 8. Gasket 9. Electric throttle control actuator
10. PCV hose 11. O-ring 12. Manifold absolute pressure (MAP)
sensor
A. To rocker cover (bank 2) B. To centralized under-floor piping C. To rocker cover (bank 1)
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56

INTAKE MANIFOLDEM-31
< REMOVAL AND INSTALLATION >
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 Never spill engine coolant on drive belts.
NOTE:
When removing only intake manifold, move electric
throttle control actuator without disconnecting the
water hoses.
7. Remove electric throttle control actuator.  Loosen mounting bolts in reverse order as shown in the figure.
NOTE:
The figure shows the electric throttle control actuator viewed
from the air duct side.
CAUTION:
 Handle carefully to avoid an y impact to electric throttle
control actuator.
 Never disassemble.
8. Remove intake manifold, using a power tool.  Loosen mounting bolts in reverse order as shown in the figure.
9. Remove intake manifold gaskets. CAUTION:
Cover engine openings to avoid entry of foreign materials.
10. Remove manifold absolute pressure (MAP) sensor, if necessary. CAUTION:
Handle carefully to avoid any impact to manifold absolute pressure (MAP) sensor.
INSTALLATION
Note the following item, and install in the reverse order of removal.
Intake Manifold
Tighten in numerical order as shown in the figure.
Electric Throttle Control Actuator
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: Engine front
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: Engine front
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Revision: 2010 May2011 QX56

EM-40
< REMOVAL AND INSTALLATION >
EXHAUST MANIFOLD AND THREE WAY CATALYST
EXHAUST MANIFOLD AND THREE WAY CATALYST
Exploded ViewINFOID:0000000006289550
Removal and InstallationINFOID:0000000006289551
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have cooled sufficiently.
1. 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 belt.
2. Remove reservoir tank. Refer to CO-13, "
Exploded View".
3. Remove drive belt. Refer to EM-20, "
Removal and Installation".
4. Remove power steering oil pump. Refer to ST-48, "
Exploded View".
5. Remove radiator. Refer to CO-13, "
Exploded View".
6. Remove front under cover. Refer to EXT-25, "
Exploded View".
7. Remove front wheels and tires. Refer to WT-64, "
Exploded View".
8. Remove A/C compressor. Refer to HA-30, "
Exploded View".
9. Remove alternator and alternator bracket. Refer to CHG-25, "
Exploded View".
10. Remove exhaust front tube (bank 1 and bank 2). Refer to EX-5, "
Exploded View".
1. Air fuel ratio sensor 1 (bank 2) 2. Exhaust manifold cover (bank 2) 3. Exhaust manifold and three way cat-
alyst (bank 2)
4. Gasket 5. Exhaust manifold and three way cat-
alyst (bank 1)6. Exhaust manifold cover (bank 1)
7. Air fuel ratio sensor 1 (bank 1)
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56