2011 INFINITI QX56 Coil

EM-16
< BASIC INSPECTION >
COMPRESSION PRESSURE
COMPRESSION PRESSURE
InspectionINFOID:0000000006289521
1. Warm up engine thoroughly. Then, stop it.
2. Release fuel pressure. Refer to EC-153, "
Work Procedure".
CAUTION:
If CONSULT-III is not used to release fuel pr essure leave the fuel pump fuse disconnected until
step 7.
3. Remove fuel pump fuse in IPDM E/R. NOTE:
 For the fuse number, refer to EC-114, "
Wiring Diagram".
 For the fuse arrangement, refer to PG-143, "
Fuse, Connector and Terminal Arrangement".
4. Remove engine cover. Refer to EM-25, "
Exploded View".
5. Remove ignition coil and spark plug from each cylinder. Refer to EM-29, "
Exploded View".
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install the compression tester with Tool [SST: EG15050500 (J- 45402)] into the spark plug hole.
8. Measure compression pressure using compressi on gauge connected with flexible type adapter (commer-
cial service tool).
9. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression pressure and the engine rpm. Perform these steps to check each
cylinder.
CAUTION:
 Measure a six-cylinder under the same conditio ns since a measurement depends on measure-
ment conditions (engine water temperature, etc.).
 Always use a fully changed battery to obtain the specified engine speed.
 If the engine speed is out of the specified range, c heck battery liquid for proper gravity. Check the
engine speed again with normal battery gravity. Refer to PG-159, "
How to Handle Battery".
 If compression pressure is below the minimum value, check valve clearances and parts associated with combustion chamber (valve, valve seat, piston, pi ston ring, cylinder bore, cylinder head, cylinder head
gasket). After checking, measure compression pressure again.
 If a cylinder has low compression pressure, pour a small amount of engine oil into the spark plug hole of the cylinder to re-check it for compression.
- If the added engine oil improves the compression, pi ston rings may be worn out or damaged. Check pis-
ton rings and replace if necessary. Refer to EM-107, "
Disassembly and Assembly".
- If the compression pressure remains at low level despite the addition of engine oil, valves may be mal- functioning. Check valves for damage. Replace valve or valve seat accordingly. Refer to EM-107, "
Dis-
assembly and Assembly".
 If two adjacent cylinders have respectively low co mpression pressure and their compression remains
low even after the addition of engine oil, cylinder head gaskets are leaking. In such a case, replace cyl-
inder head gaskets. Refer to EM-87, "
Removal and Installation".
10. After inspection is completed, install removed parts.
11. Start the engine, and check that the engine runs smoothly.
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Compression pressure : Refer to EM-132, "GeneralSpecification".
Revision: 2010 May2011 QX56

SPARK PLUGEM-23
< PERIODIC MAINTENANCE >
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SPARK PLUG
Exploded ViewINFOID:0000000006289531
Removal and InstallationINFOID:0000000006289532
REMOVAL
1. Remove engine cover. Refer to
EM-25, "Exploded View".
2. Remove ignition coil. Refer to EM-29, "
Exploded View".
3. Remove spark plug with a spark plug wrench (commercial ser- vice tool).
INSTALLATION
Note the following item, installa is the reverse order of removal.
CAUTION:
1. Ignition coil (No. 2, 4) 2. Ignition coil (No. 6, 8) 3. Spark plug
4. Rocker cover (bank 2) 5. Rocker cover (bank 1) 6. Ignition coil (No. 1, 3)
7. Ignition coil (No. 5, 7)
Refer to GI-4, "
Components" for symbols in the figure.
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a : 14 mm (0.55 in)
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Revision: 2010 May2011 QX56

EM-24
< PERIODIC MAINTENANCE >
SPARK PLUG
Install ignition coil marked with an identification mark (A) on
cylinder No. 5, 6, 7 and 8.
InspectionINFOID:0000000006289533
INSPECTION AFTER REMOVAL
Use the standard type spark plug for normal condition.
CAUTION:
 Never drop or impact spark plug.
 Never use a wire brush for cleaning.
 If plug tip is covered with carbon, use spark plug cleaner to clean.
 Measure spark plug gap. When it exceeds the limit, replace spark plug even if it is within the speci-
fied replacement mileage. Refer to EM-132, "
Spark Plug".
 Spark plug gap adjustment is not required between replace-
ment intervals.
: Engine front
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Spark plug (Standard type) : Refer to EM-132, "Spark Plug".
Cleaner air pressure : Less than 588 kPa (5.9 bar, 6 kg/cm
2, 85 psi)
Cleaning time : Less than 20 seconds
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Revision: 2010 May2011 QX56

IGNITION COILEM-29
< REMOVAL AND INSTALLATION >
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IGNITION COIL
Exploded ViewINFOID:0000000006289541
Removal and InstallationINFOID:0000000006289542
REMOVAL
1. Remove engine cover. Refer to
EM-25, "Exploded View".
2. Remove ignition coil. CAUTION:
Never impact it.
NOTE:
Installation position of ignition coil depends on cylinder position.
INSTALLATION
1. Install ignition coil.CAUTION:
 Install Ignition coil marked with an identification mark (A)
on cylinder No. 5, 6, 7 and 8.
2. Install engine cover.
1. Ignition coil (No. 2, 4) 2. Ignition coil (No. 6, 8) 3. Spark plug
4. Rocker cover (bank 2) 5. Rocker cover (bank 1) 6. Ignition coil (No. 1, 3)
7. Ignition coil (No. 5, 7)
Refer to GI-4, "
Components" for symbols in the figure.
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: Engine front
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Revision: 2010 May2011 QX56

ROCKER COVEREM-33
< REMOVAL AND INSTALLATION >
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ROCKER COVER
Exploded ViewINFOID:0000000006289545
Removal and InstallationINFOID:0000000006289546
REMOVAL
1. Remove engine cover and bracket (rear). Refer to
EM-25, "Exploded View".
2. Disconnect PCV hose from rocker cover.
3. Remove air cleaner case (upper) and air duct. Refer to EM-27, "
Exploded View".
4. Move the following parts to the position without the hindrance for work.  Oil level gauge guide. Refer to EM-57, "
Exploded View".
 Power steering fluid reservoir tank bracket. Refer to ST-54, "
Exploded View".
 EVAP canister purge control solenoid valve. EM-30, "
Exploded View".
 Fuel feed hose. Refer to EM-43, "
Exploded View".
5. Remove VVEL actuator motor assembly. Refer to EM-36, "
Exploded View".
6. Remove ignition coil. Refer to EM-29, "
Exploded View".
CAUTION:
Never impact it.
7. Remove rocker cover.
1. Oil filler cap 2. Clamp 3. PCV hose
4. Rocker cover (bank 2) 5. Rocker cover gasket (bank 2) 6. Rocker cover gasket (bank 1)
7. Rocker cover (bank 1) 8. PCV hose 9. O-ring
10. PCV valve 11. Clamp 12. PCV hose
13. PCV valve 14. O-ring
A. To air duct B. To intake manifold C. Comply with the installation proce-
dure when tightening. Refer to
EM-
33, "Removal and Installation".
Refer to GI-4, "
Components" for symbols in the figure.
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Revision: 2010 May2011 QX56

ROCKER COVEREM-35
< REMOVAL AND INSTALLATION >
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4. Tighten bolts in two steps separately in numerical order as
shown in the figure.
 Because of the limited working space, use adapter and torquewrench assembly [SST: KV10119300 ( — )] (A) to tighten
bolts (on the No.7 and No. 8 cylinders) to the specified torque.
5. Install ignition coil. Refer to EM-29, "
Exploded View".
CAUTION:
 Install Ignition coil marked with an identification mark (A)
on cylinder No. 5, 6, 7 and 8.
6. Install VVEL actuator motor assembly. Refer to EM-36, "
Exploded View".
7. Install in the reverse order of removal.
A: Bank 2
B: Bank 1
: Engine front
1st step : 2.0 N·m (0.2 kg-m, 18 in-lb)
2nd step : 8.3 N·m (0.85 kg-m, 73 in-lb)
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: Engine front
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: Engine front
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Revision: 2010 May2011 QX56

EM-84
< REMOVAL AND INSTALLATION >
CAMSHAFT
 Move control shaft (A) to the small stopper and large stopper tocheck that the control shaft functions smoothly.
CAUTION:
Turn VVEL ladder assembly upside down to prevent the drive
shaft from dropping off.
RINK CHECK FOR BACK-LASH (BONDING) Check that the link and the shaft of drive shaft and control shaft are
not fixed.
 Check this by moving drive shaft and control shaft in the axial and
rotation directions.
 If there is an unusualness related to the above three items, replace VVEL ladder assembly & cylinder head
assembly.
NOTE:
VVEL ladder assembly cannot be replaced as a singl e part, because it is machined together with cylinder
head assembly.
INSPECTION AFTER ASSEMBLY
Inspection of Camshaft Sprocket (INT) Oil Groove
CAUTION:
 Perform this inspection only when DTC P0011, P 0021 are detected in self-diagnostic results of CON-
SULT-III and it is directed according to inspection procedure of EC section. Refer to EC-177, "
DTC
Logic".
 Check when engine is cold to prevent burns from the splashing engine oil.
1. Check engine oil level. Refer to LU-7, "
Inspection".
2. Perform the following procedure to prevent the engine from being unintentionally started while checking.
a. Release the fuel pressure. Refer to EC-153, "
Work Procedure".
b. Disconnect ignition coil and injector harness connectors.
3. Remove valve timing control solenoid valve. Refer to EM-61, "
Exploded View".
4. Crank engine, and then check that engine oil comes out from valve timing control solenoid valve hole (A). End crank after
checking.
WARNING:
Be careful not to touch rotati ng parts (drive belt, idler pul-
ley, and crankshaft pulley, etc.).
CAUTION:
 Prevent splashing by using a shop cloth to prevent the worker from injury from en gine oil and to prevent engine
oil contamination.
 Prevent splashing by using a shop cloth to prevent engine oil from being splashed to engine and
vehicle. Especially, be careful not to apply engine oil to rubber parts of drive belt, engine mount-
ing insulator, etc. Wipe engine oil out immediately if it is splashed.
: Engine front
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1 : Valve timing control cover (bank 2)
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Revision: 2010 May2011 QX56

ENGINE STAND SETTINGEM-103
< UNIT DISASSEMBLY AND ASSEMBLY >
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UNIT DISASSEMBLY AND ASSEMBLY
ENGINE STAND SETTING
SettingINFOID:0000000006289579
NOTE:
Explained here is how to disassemble with engine stand s
upporting transmission surface. When using a differ-
ent type of engine stand, note the difference in the steps, etc.
1. Remove the engine assembly from the vehicle. Refer to EM-98, "
Exploded View".
2. Remove crankshaft pulley. Refer to EM-96, "
FRONT OIL SEAL : Removal and Installation".
NOTE:
The drive plate is fixed with a ring gear stopper [SST: KV10119200 (J-49277)]. Loosen the crankshaft pul-
ley mounting bolts before installing the engine stand.
3. Remove the parts that may restrict installation of engine to a widely used engine stand.  Fix crankshaft with a ring gear stopper [SST: KV10119200 (J-49277)]. Loosen drive plate mounting bolt
with power tool.
 Check for deformation or damage of drive plate. Refer to EM-115, "
Inspection".
NOTE:
The procedure is described assuming that you us e a widely used engine stand holding the surface, to
which transmission is installed.
4. Remove pilot converter using the pilot bushing puller (commercial service tool), if necessary.
5. Lift the engine with hoist to inst all it onto the widely used engine stand.
CAUTION:
Use an engine stand that has a load capacity [240 kg (529 lb) or more] large enough for supporting
the engine weight.
 If the load capacity of the stand is not adequate, remove the following parts beforehand to reduce the potential risk of overturning the stand.
- Remove intake manifold. Refer to EM-30, "
Exploded View".
- Remove fuel injector and fuel tube assembly. Refer to EM-48, "
Exploded View".
- Remove ignition coil. Refer to EM-29, "
Exploded View".
- Remove rocker cover. Refer to EM-33, "
Exploded View".
- Remove exhaust manifold. Refer to EM-40, "
Exploded View".
- Other removable brackets. NOTE:
The figure shows an example of widely used engine stand (A)
that can hold mating surface of transmission with drive plate
removed.
CAUTION:
Before removing the hang ing chains, check the engine
stand is stable and there is no risk of overturning.
6. Drain engine oil. Refer to LU-8, "
Draining".
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Revision: 2010 May2011 QX56