INFINITI QX56 2011 Factory Service Manual

CAMSHAFTEM-79
< REMOVAL AND INSTALLATION >
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1. Put V-block on precise flat table, and support No. 2 and 5 jour-
nals of camshaft.
CAUTION:
Never support No. 1 journal (on the side of camshaft
sprocket) because it has a different diameter from the other
four locations.
2. Set a dial indicator vertically to No. 3 journal.
3. Turn exhaust camshaft to one direction with hands, and mea- sure the camshaft runout on a dial indicator. (Total indicator
reading)
4. If it exceeds the limit, replace exhaust camshaft.
Exhaust Camshaft Cam Height
 Measure the exhaust camshaft cam height with a micrometer.
 If wear exceeds the limit, replace exhaust camshaft.
Exhaust Camshaft Journal Oil Clearance
EXHAUST CAMSHAFT JOURNAL DIAMETER
 Measure the outer diameter of exhaust camshaft journal with a micrometer (A).
VVEL LADDER ASSEMBLY (EXH SIDE) INNER DIAMETER Tighten VVEL ladder assembly bolts to the specifi ed torque. Refer to “ASSEMBLY” for the tightening proce-
dure.
 Measure inner diameter (A) of VVEL ladder assembly (exhaust side) with a bore gauge.
EXHAUST CAMSHAFT JOURNAL OIL CLEARANCE
Standard and limit
: Refer to EM-133, "
Camshaft".
PBIC0929E
Standard and limit
: Refer to EM-133, "
Camshaft".
EMQ0072D
Standard : Refer to EM-133, "Camshaft".
JPBIA0122ZZ
Standard : Refer to EM-133, "Camshaft".
PBIC1645E
Revision: 2010 May2011 QX56

EM-80
< REMOVAL AND INSTALLATION >
CAMSHAFT
 (Oil clearance) = [VVEL ladder assembly (exhaust side) inner diameter] – [Exhaust camshaft journal diame-
ter].
 If the calculated value exceeds the limit, replace either or both exhaust camshaft and 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.
Exhaust Camshaft End Play
 Install a dial indicator in thrust direction on front end of camshaft. Measure the end play of a dial indicator when exhaust camshaft is
moved forward/backward (in direction of axis).
 Measure the following parts if out of the limit.
- Dimension “A” for exhaust camshaft No. 1 journal
- Dimension “B” for cylinder head No. 1 journal bearing
 Refer to the standards above, and then replace exhaust camshaft
and/or VVEL ladder assembly & cylinder head assembly.
NOTE:
Cylinder head assembly cannot be replaced as a single part,
because it is machined together with VVEL ladder assembly.
Exhaust Camshaft Sprocket Runout
1. Put V-block on precise flat table, and support No. 2 and 5 journals of exhaust camshaft.
CAUTION:
Never support No. 1 journal (on the side of cam shaft sprocket) because it has a different diameter
from the other four locations.
2. Measure the exhaust camshaft sprocket runout with a dial indi- cator. (Total indicator reading)
3. If it exceeds the limit, replace exhaust camshaft sprocket.
Valve Lifter (EXH)
Standard and limit : Refer to EM-133, "Camshaft".
Standard and limit : Refer to EM-133, "
Camshaft".
SEM864E
Standard : 30.500 - 30.548 mm (1.2008 - 1.2027 in)
Standard : 30.360 - 30.385 mm (1.1953 - 1.1963 in)
JPBIA3516ZZ
Limit : Refer to EM-133, "Camshaft".
PBIC0930E
Revision: 2010 May2011 QX56

CAMSHAFTEM-81
< REMOVAL AND INSTALLATION >
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 Check if surface of valve lifter has any wear or crack.
 If wear or crack is found, replace valve lifter (EXH). Refer to
EM-
133, "Camshaft".
Valve Lifter Clearance (EXH)
VALVE LIFTER OUTER DIAMETER Measure the outer diameter at 1/2 height of valve lifter with a
micrometer (A) since valve lifter is in barrel shape.
VALVE LIFTER HOLE DIAMETER Measure the inner diameter of va lve lifter hole of cylinder head with
an inside micrometer.
VALVE LIFTER CLEARANCE (Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter)
 If the calculated value is out of the standard, referr ing to each standard of valve lifter outer diameter and
valve lifter hole diameter, replace either or both valve lifter and VVEL ladder assembly & cylinder head
assembly.
NOTE:
Cylinder head assembly cannot be replaced as a single pa rt, because it is machined together with VVEL lad-
der assembly.
INSPECTION AFTER DISASSEMBLY (INTAKE SIDE)
Drive Shaft End Play
KBIA0182E
Standard : Refer to EM-133, "Camshaft".
JPBIA0125ZZ
Standard : Refer to EM-133, "Camshaft".
SEM867E
Standard : Refer to EM-133, "Camshaft".
Revision: 2010 May2011 QX56

EM-82
< REMOVAL AND INSTALLATION >
CAMSHAFT
 Install a dial indicator in thrust direction on front end of drive shaft.Measure the end play of a dial indicator when drive shaft is moved
forward/backward (in direction of axis).
 Measure the following parts if out of the limit.
- Dimension “A” for drive shaft No. 1 journal
- Dimension “B” for cylinder head No. 1 journal bearing
 If it exceeds the limit, replace VVEL ladder assembly & cylinder head assembly.
NOTE:
Cylinder head assembly cannot be replaced as a single part, because it is machined together with VVEL lad-
der assembly.
Camshaft Sprocket (INT) Runout
1. Put V-block on precise flat table, and support No. 2 and 5 journals of drive shaft. CAUTION:
Never support No. 1 journal (on the side of cam shaft sprocket) because it has a different diameter
from the other four locations.
2. Measure the camshaft sprocket (INT) runout with a dial indicator. (Total indicator reading)
3. If it exceeds the limit, r eplace camshaft sprocket (INT).
Valve Lifter (INT)
 Check if surface of valve li fter has any wear or crack.
 If wear or crack is found, replace VVEL ladder assembly & cylinder
head assembly. Refer to EM-133, "
Camshaft".
NOTE:
Since the valve lifter (INT) cannot be replaced by the piece, VVEL
ladder assembly & cylinder head assembly replacement are
required.
Valve Lifter Clearance (INT)
VALVE LIFTER OUTER DIAMETER
: Engine front
Standard and limit : Refer to EM-133, "Camshaft".
JPBIA3517ZZ
: Engine front
Standard : 30.500 - 30.548 mm (1.2008 - 1.2027 in)
Standard : 30.360 - 30.385 mm (1.1953 - 1.1963 in)
JPBIA3516ZZ
Limit : Refer to EM-133, "Camshaft".
KBIA0182E
Revision: 2010 May2011 QX56

CAMSHAFTEM-83
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 Measure the outer diameter at 1/2
height of valve lifter (INT) with a
micrometer (A) since valve lifter is in barrel shape.
VALVE LIFTER HOLE DIAMETER Measure the inner diameter of va lve lifter hole of cylinder head with
an inside micrometer.
VALVE LIFTER CLEARANCE (Valve lifter clearance) = (Valve lifter hole diameter) – (Valve lifter outer diameter)
 If the calculated value is out of the standard, r eplace VVEL ladder assembly & cylinder head assembly.
NOTE:
Since the valve lifter (INT) cannot be replaced by t he piece, VVEL ladder assembly & cylinder head assem-
bly replacement are required.
VVEL Ladder Assembly
DRIVE SHAFT OPERATIONAL CHECK Hold the both ends of the drive shaft (A) and rotate it to check that it rotates smoothly.
CAUTION:
Turn VVEL ladder assembly upside down to prevent the drive
shaft from dropping off.
CONTROL SHAFT OPERATIONAL CHECK
Standard : Refer to EM-133, "Camshaft".
JPBIA0125ZZ
Standard : Refer to EM-133, "Camshaft".
SEM867E
Standard : Refer to EM-133, "Camshaft".
JPBIA3520ZZ
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
JPBIA3521ZZ
JPBIA3522ZZ
1 : Valve timing control cover (bank 2)
JPBIA3523ZZ
Revision: 2010 May2011 QX56

CAMSHAFTEM-85
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5. Perform the following inspection if engine oil does not
come out from valve timing control solenoid valve
oil hole of the valve timing control cover.
 Remove oil filter, and then clean it. Refer to EM-61, "
Exploded View".
 Clean oil groove between oil strainer and valve timing control solenoid valve. Refer to LU-5, "
Engine
Lubrication System" and LU-6, "Engine Lubrication System Schematic".
6. Remove components between valve timing control solenoid valve and camshaft sprocket, and then check each oil groove for clogging.
 Clean oil groove if necessary. Refer to LU-5, "
Engine Lubrication System" and LU-6, "Engine Lubrica-
tion System Schematic".
7. After inspection, install removed parts in the reverse order.
Inspection for Leakage
The following are procedures for chec king fluid leakage, lubricant leakage.
 Before starting engine, check oil/fluid levels including engine coolant and engine oil. If any are less than the
required quantity, fill them to the specified level. Refer to MA-10, "
Fluids and Lubricants".
 Follow the procedure below to check for fuel leakage.
- Turn ignition switch to the “ON” position (with engi ne stopped). With fuel pressure applied to fuel piping,
check for fuel leakage at connection points.
- Start engine. With engine speed increased, check again for fuel leakage at connection points.
 Run engine to check for unusual noise and vibration. NOTE:
If hydraulic pressure inside chain tensioner drops after removal/installation, slack in guide may generate a
pounding noise during and just after the engine start. However, this does not indicate a malfunction. The
noise will stop after hydraulic pressure rises.
 Warm up engine thoroughly to check that there is no leak age of fuel, or any oil/fluids including engine oil and
engine coolant.
 Bleed air from lines and hoses of applicable lines, such as in cooling system.
 After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill them to
the specified level, if necessary.
Summary of the inspection items:
* Power steering fluid, brake fluid, etc. Items Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Transmission /
transaxle fluid AT & CVT Models Leakage Level / Leakage Leakage
MT Models Level / Leakage Leakage Level / Leakage
Other oils and fluids* Level Leakage Level
Fuel Leakage Leakage Leakage
Revision: 2010 May2011 QX56

EM-86
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
CYLINDER HEAD
Exploded ViewINFOID:0000000006289571
CAUTION:
A high degree of precision is required for a valve on the intake side. Never remove the valve related
parts unless necessary.
1. Valve lifter (EXH) 2. Valve collet (EXH) 3. Valve spring retainer (EXH)
4. Valve oil seal (EXH) 5. Valve spring (with valve spring seat)
(EXH)6. Valve guide (EXH)
7. Spark plug 8. Valve lifter (INT) 9. Valve collet (INT)
10. Valve spring retainer (INT) 11. Valve oil seal (INT) 12. Valve spring (with valve spring seat)
(INT)
13. Cylinder head bolt 14. Cylinder head (bank 2) 15. Valve seat (EXH)
16. Valve (EXH) 17. Cylinder head gasket (bank 2) 18. Oil filter (for VVEL ladder assembly)
19. Cylinder block 20. Valve (INT) 21. Valve seat (INT)
22. Cylinder head gasket (bank 1) 23. Cylinder head (bank 1) 24. Engine coolant temperature sensor
A. Comply with the installation proce-
dure when tightening. Refer to
EM-
87, "Removal and Installation".
Refer to GI-4, "
Components" for symbol marks in the figure.
JPBIA3524GB
Revision: 2010 May2011 QX56

CYLINDER HEADEM-87
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NOTE:
 As for replacement of parts on the intake side as
shown in the exploded view, replace VVEL ladder assem-
bly & cylinder head assembly. (Only valve oil seals are replaceable as a single part.)
 VVEL ladder assembly cannot be replaced as a singl e part, because it is machined together with cylinder
head assembly.
Removal and InstallationINFOID:0000000006289572
REMOVAL
1. Remove the following parts:  Rocker cover and spark plug: Refer to EM-33, "
Exploded View".
 Intake manifold: Refer to EM-30, "
Exploded View".
 Exhaust manifold: Refer to EM-40, "
Exploded View".
 Water inlet and thermostat housing: Refer to CO-20, "
Exploded View".
 Water pipe and heater pipe: Refer to CO-20, "
Exploded View".
 Timing chain: Refer to EM-61, "
Exploded View".
 Camshaft (EXH) and VVEL ladder assembly: Refer to EM-74, "
Exploded View".
2. Remove cylinder head.  Loosen mounting bolts in reverse order as shown in the figure.
 Use TORX socket and power tool.
3. Remove cylinder head gaskets.
4. Remove oil filter (for VVEL ladder asse mbly) from cylinder block, if necessary.
5. Remove valve lifter.  Identify installation positions, and store them without mixing them up.
INSTALLATION
1. Install oil filter (for VVEL l adder assembly) (1) in the direction
shown in the figure, if removed.
 Check that the oil filter does not protrude from the upper sur-
face of cylinder block (2) after installation.
A: Bank 2
B: Bank 1
: Engine front
JPBIA2145ZZ
JPBIA2129ZZ
Revision: 2010 May2011 QX56

EM-88
< REMOVAL AND INSTALLATION >
CYLINDER HEAD
2. Install new cylinder head gaskets.
3. Install cylinder head as per the following: CAUTION:
 If cylinder head bolts are re-used, check their ou ter diameters before installation. Refer to EM-92,
"Inspection".
 Before installing cylinder head, inspect cylinder head distortion. Refer to EM-92, "
Inspection".
 Tighten cylinder head bolts in numerical order as shown in fig- ure.
 Use TORX socket.
a. Apply new engine oil to threads and seat surfaces of cylinder head bolts.
b. Tighten all cylinder head bolts.
c. Tighten all cylinder head bolts (clockwise).
d. Completely loosen all cylinder head bolts.
CAUTION:
In step “d”, loosen bolts in the reverse order of that indi-
cated in the figure.
e. Tighten all cylinder head bolts.
f. Tighten all cylinder head bolts (clockwise).
g. Tighten all cylinder head bolts again (clockwise).
CAUTION:
Check the tightening angle us ing the angle wrench [SST:
KV10112100 (BT8653-A)] (A). Never make judgment by
visual inspection.
 Check tightening angle indicated on the angle wrench indica- tor plate.
4. Install valve lifter.  Install it in the original position.
5. Install in the reverse order of removal.
A: Bank 2
B: Bank 1
: Engine front
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
Angle tightening: 75 degrees : 0 N·m (0 kg-m, 0 ft-lb)
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
JPBIA2145ZZ
Angle tightening: 90 degrees
Angle tightening: 90 degrees
JPBIA0175ZZ
Revision: 2010 May2011 QX56