2011 INFINITI QX56 Factory Service Manual

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Page 2641 of 5598

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 (

Page 2642 of 5598

INFINITI QX56 2011 Factory Service Manual
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 l

Page 2643 of 5598

INFINITI QX56 2011 Factory Service Manual
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

Page 2644 of 5598

INFINITI QX56 2011 Factory Service Manual
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/backw

Page 2645 of 5598

INFINITI QX56 2011 Factory Service Manual
CAMSHAFTEM-83
< REMOVAL AND INSTALLATION >
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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

Page 2646 of 5598

INFINITI QX56 2011 Factory Service Manual
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 upsi

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

Page 2647 of 5598

INFINITI QX56 2011 Factory Service Manual
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

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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

Page 2648 of 5598

INFINITI QX56 2011 Factory Service Manual
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 va

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