2006 INFINITI QX56 engine

ENGINE ASSEMBLYEM-75
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Revision: November 2009 2006 QX56
4. Remove the engine hood. Refer to BL-13, "Removal and Installation of Hood Assembly" .
5. Remove the cowl extension. Refer to EI-18, "
Removal and Installation" .
6. Remove the engine room cover using power tools.
7. Remove the air duct and air cleaner case assembly. Refer to EM-15, "
Removal and Installation" .
8. Disconnect the vacuum hose between the vehicle and engine and set it aside.
9. Remove the radiator assembly and hoses. Refer to CO-14, "
Removal and Installation" .
10. Remove the drive belts. Refer to EM-13, "
Removal and Installation" .
11. Remove the fan blade. Refer to CO-17, "
Removal and Installation (Crankshaft Driven Type)" .
12. Disconnect the engine room harness from the fuse box and set it aside.
13. Disconnect the ECM.
14. Disconnect the engine room harness from the engine side and set it aside.
15. Disconnect the engine harness grounds.
16. Disconnect the power steering reservoir tank from the engine and move it aside.
17. Disconnect the power steering oil pump from the engine. Move it aside and secure it using suitable wire or rope. Refer to PS-21, "
Removal and Installation" .
18. Remove the A/C compressor bolts and set the compressor aside. Refer to ATC-175, "
Removal and Instal-
lation for Compressor" (ATC).
19. Disconnect the brake booster vacuum line.
20. Disconnect the EVAP line.
21. Disconnect the fuel hose at the engine side connection. Refer to EM-31, "
Removal and Installation" .
22. Disconnect the heater hoses at the cowl, and install plugs to avoid leakage of engine coolant.
23. Remove the A/T oil level indicator and indicator tube upper bolts.
24. Remove the front final drive assembly (4WD only). Refer to FFD-12, "
Removal and Installation" .
25. Remove the exhaust manifolds. Refer to EM-21, "
Removal and Installation" .
26. Install the engine slingers into the left bank cylinder head and right bank cylinder head.
27. Remove the A/T. Refer to AT- 2 4 3 , "
Removal and Installation
(2WD)" or AT- 2 4 6 , "Removal and Installation (4WD)" .
28. Lift using a hoist and secure the engine in position.
29. Remove the engine assembly from the vehicle, avoid interfer- ence with the vehicle body.
CAUTION:

Before and during lifting, always check if any harnesses
are left connected.
30. Remove the parts that may restrict installation of the engine to the engine stand.
NOTE:
This procedure is described assuming that you use an engine stand mounting to the surface to which the
transmission mounts.
a. Remove the drive plate.

Holding the crankshaft pulley bolt, lock the crankshaft to remove the drive plate bolts.
WBIA0464E
Engine slinger torque: 45.0 N·m (4.6 kg-m, 33 ft-lb)
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ENGINE ASSEMBLY
2006 QX56

Loosen the bolts diagonally.
CAUTION:

Be careful not to damage the drive plate. Especially
avoid deforming and damaging of the signal plate teeth
(circumference position).

Place the drive plate with the signal plate surface fac-
ing other than downward.

Keep magnetic materials away from the signal plate.
CAUTION:
Use an engine stand that has a load capacity [approximately 240kg (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 the fuel tube and fuel injector assembly. Refer to EM-31, "Removal and Installation" .
–Remove the intake manifold. Refer to EM-17, "Removal and Installation" .
–Remove the ignition coil. Refer to EM-28, "Removal and Installation" .
–Remove the rocker cover. Refer to EM-35, "Removal and Installation" .
–Other removable brackets.
CAUTION:
Before removing the hanging chains, make sure the engine stand is stable and there is no risk of
overturning.
31. Remove the alternator. Refer to SC-25, "
REMOVAL" .
32. Remove the engine mounting insulator and bracket using power tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

When replacing an engine or transmission you must make sure the dowels are installed correctly
during re-assembly.

Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of driv-
etrain components.
INSPECTION AFTER INSTALLATION

Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are
lower than required quantity, fill to the specified level. Refer to MA-11, "
Fluids and Lubricants" .

Use procedure below to check for fuel leakage.

Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel
leakage at the 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.

Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids includ-
ing engine oil and engine coolant.

Bleed air from passages in lines and hoses, such as in cooling system.

After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to
specified level if necessary.

Summary of the inspection items:
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ENGINE ASSEMBLYEM-77
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Revision: November 2009 2006 QX56
*Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.Item
Before starting engine Engine runningAfter engine stopped
Engine coolant LevelLeakage Level
Engine oil LevelLeakage Level
Other oils and fluids* LevelLeakage Level
Fuel LeakageLeakageLeakage
Exhaust gas —Leakage —

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* Refer to GI-46, "Recommended Chemical Products and Sealants" .
DISASSEMBLY
NOTE:
Explained here is how to disassemble with engine stand supporting transmission surface. When using differ-
ent type of engine stand, some steps may be different.
1. Remove engine assembly and mount to engine stand. Refer to EM-74, "
Removal and Installation" .
CAUTION:
Before removing the hanging chains, make sure engine stand is stable and there is no risk of over-
turning.
2. Drain engine oil. Refer to LU-8, "
Changing Engine Oil" .
3. Drain engine coolant by removing the cylinder block drain plugs “A”, “B ”, “C” and “D ” as shown.
4. Remove the following components and associated parts (the parts referred to in step 1 are not included here).

Oil pan (upper and lower) and oil strainer. Refer to EM-24, "Removal and Installation" .

Crankshaft pulley, front cover and timing chain. Refer to EM-37, "Removal and Installation" .

Camshaft. Refer to EM-46, "Removal and Installation" .

Cylinder head. Refer to EM-64, "Removal and Installation" .
5. Remove knock sensor and sub harness.
CAUTION:
Carefully handle sensor, avoiding shocks.
6. Check connecting rod side clearance. Refer to EM-94, "
CONNECTING ROD SIDE CLEARANCE" .
7. Remove piston and connecting rod assembly as follows.
a. Position the crankshaft pin corresponding to the connecting rod to be removed onto bottom dead center.
1. Knock sensor sub-harness 2. Knock sensor 3. Cylinder block
4. Main bearing upper 5. Top ring 6. Second ring
7. Oil ring 8. Crankshaft key 9. Piston
10. Connecting rod 11. Snap ring 12. Piston pin
13. Connecting rod bearing 14. Connecting rod bearing cap 15. Main bearing cap
16. Thrust bearing lower 17. Main bearing lower 18. Crankshaft
19. Pilot converter 20. Thrust bearing upper 21. Side bolt
22. Drive plate 23. Reinforcement plate 24. Rear oil seal retainer
25. Rear oil seal 26. Transmission 27. O-ring
28. Crankshaft position sensor (POS) 29. Gasket 30. Cylinder block heater
31. Connector cap
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EM-82Revision: November 2009
CYLINDER BLOCK
2006 QX56
18. Remove pilot converter using Tool if necessary.
ASSEMBLY
1. Fully air-blow the coolant and oil passages in the cylinder block, cylinder bore, and crankcase to removeany foreign material.
CAUTION:
Use goggles to protect your eyes.
2. Install each plug to the cylinder block (only screw-type plugs are shown).

Apply liquid gasket.
Use Genuine Thread Sealant or equivalent. Refer to GI-
46, "Recommended Chemical Products and Sealants".

Replace copper washers with new ones.

Tighten each plug as specified below.
3. Install main bearings and thrust bearings.
a. Remove any dust, dirt, and oil on the bearing mating surfaces of the cylinder block and main bearing caps.
b. Install thrust bearings to both sides of the No. 3 journal housing on the cylinder block and main bearing caps

Install thrust bearings with the oil groove facing the crankshaft
arm (outside).

Install thrust bearings with a protrusion in the center on the
main bearing caps.
c. Install main bearings paying attention to the direction.

Install the one with oil holes onto the cylinder block and the
one without oil holes onto the main bearing cap.

Before installing bearings, apply engine oil to bearing surface
(inside). Do not apply oil to the back surface, but thoroughly
clean it.

When installing, align the bearing stopper to the notch.

Ensure the oil holes on the cylinder block and those on the
corresponding bearing are aligned. Tool number : ST16610001 (J-23907)
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Part Washer
Tightening torque
A Yes 53.9 N·m (5.5 kg-m, 40 ft-lb)
BNo 19.6 N ·m (2.0 kg-m, 15 ft-lb)
C Yes 62.7 N·m (6.4 kg-m, 46 ft-lb)
D Yes 62.7 N·m (6.4 kg-m, 46 ft-lb)
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PBIC0093E
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CYLINDER BLOCKEM-83
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Revision: November 2009 2006 QX56
4. Install pilot converter to the crankshaft using suitable tool.
5. Install crankshaft to the cylinder block.

While turning crankshaft by hand, make sure it turns
smoothly.
6. Install main bearing caps.

Align the identification number to the journal position to install.

Install it with the front mark (indicated by the arrow) facing the
front of engine.

Tap caps lightly to seat them in the installation position.
7. Follow the steps below to tighten each main bearing cap bolt.
a. Apply engine oil to threads and seating surfaces of bolts, and tighten all bolts temporarily.
b. Measure tightening angle using Tool. CAUTION:
Measure tightening angle using Tool. Do not measure visu-
ally.

Rotate crankshaft by hand after bolts are tightened. Check if it rotates smoothly.

Check crankshaft side clearance. Refer to EM-94, "CRANKSHAFT END PLAY" .
8. Install rear oil seal to rear oil seal retainer. CAUTION:
Do not damage or scratch outer circumference of oil seal.
EMP0569D
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Main bearing cap bolts
in order of 1 to 10 : 39.2 N·m (4.0 kg-m, 29 ft.-lb)
Main bearing cap sub
bolts in order of 11 to 20 : 29.4 N·m (3.0 kg-m, 22 ft-lb)
PBIC0090E
Tool number : KV10112100 (BT-8653-A)
Main bearing cap bolts in
order of 1 to 10 : 40
°
Main bearing cap sub
bolts in order of 11 to 20 : 30
°
Side bolts in order of 21 to
30 : 49 N·m (5.0 kg-m, 36 ft-lb)
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EM-84Revision: November 2009
CYLINDER BLOCK
2006 QX56

Install new rear oil seal in the direction shown.

Tap until flattened with the front edge of the rear oil seal
retainer using suitable tool.

Fit the rear oil seal until it is level with the rear end surface of
rear oil seal retainer.
9. Install rear oil seal retainer.

Apply liquid gasket thoroughly to rear oil seal retainer as
shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-46, "
Recommended Chemical Products and Sealants".

Apply new engine oil on the lips of rear oil seal. Do not touch.
10. Install the piston to the connecting rod.
a. Install the snap ring to the grooves of the piston rear side.

Insert it fully into the groove to install.
b. Install the piston to the connecting rod.

Heat piston until piston pin can be pushed in by hand without excess force [approx. 60 ° to 70 C ° (140 °
to 158 ° F)]. From the front to the rear, insert the piston pin into the piston and the connecting rod.

Assemble so that the front mark on the piston crown and the
oil holes and cylinder No. on the connecting rod are posi-
tioned as shown.
c. Install the snap ring to the grooves of the piston front side.

Insert it fully into the groove to install.

After installing, make sure connecting rod moves smoothly.
SEM715A
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11. Install piston rings.
CAUTION:
Do not damage piston.

Position each ring with the gap as shown, referring to the pis-
ton front mark.

Install the second ring with the stamped surface facing
upward.
12. Install the connecting rod bearings to the connecting rod and connecting rod cap.

When installing the connecting rod bearings, apply engine oil
to the bearing surface (inside). Do not apply oil to the back
surface, but thoroughly clean it.

When installing, align the connecting rod bearing stopper pro-
trusion with the cutout of the connecting rod to install.

Check that the oil holes on the connecting rod and those on
the corresponding bearing are aligned.
13. Install the piston and connecting rod assembly to the crankshaft using Tool.

Position the crankshaft pin corresponding to the connecting
rod to be installed onto bottom dead center.

Apply engine oil sufficiently to the cylinder bore, piston, and
crankshaft pin.

Match the cylinder position with the cylinder No. on the con-
necting rod to install.

Install the piston with the front mark on the piston crown fac-
ing the front of the engine.
CAUTION:
Be careful not to damage the crankshaft pin, resulting from an interference of the connecting
rod big end.
14. Install connecting rod cap.

Match the stamped cylinder number marks on the connecting
rod with those on the cylinder cap to install. Stamped mark Second ring : 2N
PBIC0100E
PBIC0266E
Tool number : EM03470000 (J-8037)
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