2011 INFINITI QX56 engine

TIMING CHAINEM-65
< REMOVAL AND INSTALLATION >
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 Secure the hexagonal portion (located in between journal No.1
and journal No. 2) of drive shaft (A) using a wrench (B) to
loosen mounting bolt.
NOTE:
The figure shows an example of bank 2.
CAUTION:
 Never loosen the mounting bolt by securing anyt hing other than the camshaft (drive shaft) hexago-
nal portion or with tensioning the timing chain.
 When holding the hexagonal part of camshaft (drive shaft) with a wrench, be careful not to allow the
wrench to cause interference with other parts.
 Never disassemble camshaft sprocket. [Never loosen bolts (B) as shown in the figure.]
35. Use scraper to remove all traces of old liquid gasket from front cover and opposite mating surfaces.  Remove old liquid gasket from bolt hole and thread.
INSTALLATION
: Engine front
JPBIA2302ZZ
A: Intake
JPBIA3507ZZ
A : Remove old liquid gasket that is stuck
B : Bolt hole
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Revision: 2010 May2011 QX56

TIMING CHAINEM-67
< REMOVAL AND INSTALLATION >
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1. Check that crankshaft key (1) and dowel pin (A) of each cam-
shaft are located as shown in the figure.
NOTE:
Though camshaft does not stop at the position as shown in the
figure, for the placement of cam nose, it is generally accepted
camshaft is placed for the same direction of the figure.
2. Install camshaft sprockets (INT and EXH).  Install onto correct side by checking with identification mark(A) on surface.
Exhaust side: Secure the hexagonal portion of exhaust camshaft using a wrench to tighten mounting bolt. Refer toEM-74, "
Exploded View".
Intake side:
 Secure the hexagonal portion (located in between journal No.1and journal No. 2) of drive shaft (A) using a wrench (B) to
tighten mounting bolt. Refer to EM-74, "
Exploded View".
NOTE:
The figure shows an example of bank 2.
3. Install high pressure fuel pump camshaft.
4. Install timing chains as per the following:
a. Install crankshaft sprockets for both banks.  Install each crankshaft sprocket so that its flange side (thelarger diameter side without teeth) (A) faces in the direction
shown in the figure.
NOTE:
The same parts are used but facing directions are different.Camshaft dowel pin
: At cylinder head upper face side in each bank
Crankshaft key : Straight up
JPBIA2109ZZ
JPBIA2110ZZ
: Engine front
JPBIA2302ZZ
1 : Crankshaft sprocket (bank 1 side)
2 : Crankshaft sprocket (bank 2 side)
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Revision: 2010 May2011 QX56

EM-72
< REMOVAL AND INSTALLATION >
TIMING CHAIN
d. Being careful not to move seal ring from the installation groove,align dowel pins on front cover with dowel pin holes (C) to install
valve timing control covers.
e. Tighten mounting bolts in numerical order as shown in the fig- ure.
14. Install camshaft position sensor and valve timing c ontrol solenoid valve (RH and LH) to valve timing con-
trol cover, if removed.
 Be sure to tighten mounting bolts with flanges completely seated.
15. Install oil pan (upper). Refer to EM-57, "
Exploded View".
16. Install oil pan (lower) and oil strainer. Refer to EM-54, "
Exploded View".
17. Install water pump pulley. Refer to CO-18, "
Exploded View".
18. Install crankshaft pulley.  Fix the crankshaft as instructed in the removal procedure. Refer to EM-96, "
FRONT OIL SEAL :
Removal and Installation".
a. Install crankshaft pulley, taking care not to damage front oil seal.
b. Apply engine oil onto threaded parts of crankshaft pulley bolt and seating area.  Lightly tapping its center with plastic hammer, insert crankshaft pulley.
CAUTION:
Never tap crankshaft pulley on the side surface wh ere belt is installed (outer circumference).
c. Tighten crankshaft pulley bolt.
d. Put a paint mark (A) on crankshaft pulley (1) aligning with angle mark (B) on crankshaft pulley bolt.
e. Tighten crankshaft pulley bolt (clockwise).
 Check the tightening angle by referencing to the notches. Theangle between two notches is 90 degrees.
19. Rotate crankshaft pulley in normal direction (clockwise when viewed from engine front) to confirm it turns smoothly.
20. Install in the reverse order of removal.
InspectionINFOID:0000000006289567
INSPECTION AFTER DISASSEMBLY
Timing Chain
A: Bank 2
B: Bank 1
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: 205 N·m (21 kg-m, 151 ft-lb)
Angle tightening: 90 degrees (c)
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Revision: 2010 May2011 QX56

TIMING CHAINEM-73
< REMOVAL AND INSTALLATION >
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Check for cracks and any excessive
wear at link plates and roller
links of timing chain. Replace timing chain if necessary.
INSPECTION AFTER ASSEMBLY
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. A: Crack
B: Wear
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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-76
< REMOVAL AND INSTALLATION >
CAMSHAFT
 Loosen mounting bolts (gold color) in the reverse order asshown in the figure.
CAUTION:
 Never loosen adjusting bolts and mounting bolts (black color).
 When removing VVEL ladder assembly, hold the drive
shaft from below so as not to drop it.
6. Remove exhaust camshaft.
7. Remove valve lifter, if necessary.  Identify installation positions, and store them without mixing them up.
INSTALLATION
1. Install valve lifter. Install it in the original position.
2. Install exhaust camshaft.  Distinction between exhaust camshaft is performed with the
identification mark.
3. Install VVEL ladder assembly as per the following:
A: Bank 2
B: Bank 1 : Engine front
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: Engine front
Bank Paint marks
Identification rib (E)
M1 (C) M2 (D)
Bank 1 (A) No Purple Yes
Bank 2 (B) No Purple No
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Revision: 2010 May2011 QX56

CAMSHAFTEM-77
< REMOVAL AND INSTALLATION >
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a. Apply a continuous bead of liquid gasket with tube presser
(commercial service tool) to the VVEL ladder assembly as
shown in the figure.
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
b. Tighten mounting bolts in the following step, in numerical order as shown.
i. Tighten bolts in numerical order as shown.
ii. Tighten bolts in numerical order as shown.
iii. Tighten bolts in numerical order as shown.
4. Install camshaft sprockets and timing chains. Refer to EM-61, "
Exploded View".
5. Install VVEL actuator housing assembly. Refer to EM-36, "
Removal and Installation".
6. Inspect the valve clearance. Refer to EM-12, "
Inspection".
7. Install in the reverse order of removal.
8. When New VVEL ladar assembly used. Adjust VVEL control shaft position sensor. Refer to EC-150,
"Work Procedure".
InspectionINFOID:0000000006289570
EXHAUST CAMSHAFT VALVE CLEARANCE ADJUSTMENT
 Perform adjustment depending on selected head thickness of valve lifter (EXH).
A: Bank 1
B: Bank 2
c: φ3.4 - 4.4 mm (0.134 - 0.173 in)
: Engine front
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A: Bank 2
B: Bank 1
: Engine front
: 1.96 N·m (0.20 kg-m, 1 ft-lb)
: 5.88 N·m (0.60 kg-m, 4 ft-lb)
: 10.4 N·m (1.1 kg-m, 8 ft-lb)
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Revision: 2010 May2011 QX56

EM-78
< REMOVAL AND INSTALLATION >
CAMSHAFT
1. Measure the valve clearance. Refer to EM-12, "Inspection".
2. Remove VVEL ladder assembly and exhaust camshaft. Refer to EM-75, "
Removal and Installation".
CAUTION:
Never loosen adjusting bolts and mounting bolts (black color) of VVEL ladder assembly.
3. Remove valve lifter (EXH) at the locations that are out of the standard.
4. Measure the center thickness of the removed valve lifters (EXH) with a micrometer (A).
5. Use the equation below to calculate valve lifter (EXH) thickness for replacement.  Thickness of new valve lifter (EXH) can be identified by stampmarks on the reverse side (inside the cylinder).
Stamp mark 788 indicates 7.88 mm (0.3102 in) in thickness.
Available thickness of valve lifter (EXH): 27 si zes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in
steps of 0.02 mm (0.0008 in) (when m anufactured at factory). Refer to EM-133, "
Camshaft".
6. Install selected valve lifter (EXH).
7. Install VVEL ladder assembly and exhaust camshaft. Refer to EM-75, "
Removal and Installation".
8. Manually turn crankshaft pulley a few turns.
9. Check that the valve clearances for cold engine are wit hin the specifications by referring to the specified
values. Refer to EM-12, "
Inspection".
10. Install all removed parts in the reverse order of removal.
11. Warm up the engine, and check for unusual noise and vibration.
INSPECTION AFTER DISASSEMBLY (EXHAUST SIDE)
Exhaust Camshaft Runout
JPBIA0169ZZ
Valve lifter (EXH) thickness calculation: t = t1+ (C1 – C2)
t = Valve lifter (EXH) thickness to be replaced
t
1= Removed valve lifter (EXH) thickness
C
1= Measured valve clearance
C
2= Standard valve clearance: Exhaust : 0.33 mm (0.013 in)
A: Stamp
B : Thickness of valve lifter (EXH)
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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)
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Limit : Refer to EM-133, "Camshaft".
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Revision: 2010 May2011 QX56