2011 INFINITI QX56 check engine

OIL SEALEM-97
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REAR OIL SEAL : Removal and InstallationINFOID:0000000006289575
REMOVAL
1. Remove transmission assembly. Refer to
TM-205, "2WD : Exploded View" (2WD models) or TM-208,
"4WD : Exploded View" (4WD models).
2. Remove drive plate. Refer to EM-106, "
Exploded View".
3. Remove rear oil seal with a suitable tool. CAUTION:
Be careful not to damage crankshaft and cylinder block.
INSTALLATION
1. Install rear oil seal. Install rear oil seal so that each seal lip is oriented as shown in
the figure.
 Press in rear oil seal (1) to the position as shown in the figure.
 Using a suitable drift [outer diameter 101 mm (3.98 in)], press-fit until the height of rear oil seal is level with the mounting surface.
 Check the garter spring is in position and seal lips are not inverted. CAUTION:
 Be careful not to damage crankshaft and cylinder block.
 Press-fit straight and avoid cau sing burrs or tilting oil seal.
2. Install in the reverse order of removal after this step.
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A : Oil seal lip
B : Dust seal lip : Engine inside
: Engine outside
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B : Rear oil seal retainer rear end face
a : 0 - 0.5 mm (0 - 0.020 in)
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Revision: 2010 May2011 QX56

ENGINE ASSEMBLYEM-101
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5. Remove A/T assembly. Refer to
TM-205, "2WD : Exploded View" (2WD models) or TM-208, "4WD :
Exploded View" (4WD models).
6. Remove steering gear assembly. Refer to ST-41, "
Exploded View".
7. Remove front final drive assembly. Refer to DLN-162, "
Exploded View".
8. Remove exhaust manifold. Refer to EM-40, "
Exploded View".
9. Remove alternator. Refer to CHG-25, "
Exploded View".
Engine Room LH
1. Remove air cleaner and air duct. Refer to EM-27, "Exploded View".
2. Remove A/C compressor. Refer to HA-30, "
Exploded View".
3. Disconnect fuel feed hose and EVAP hose. Refer to EM-43, "
Exploded View".
CAUTION:
Fit plugs onto disconnected hoses to prevent fuel leakage.
Engine Room RH
1. Remove power steering oil pump and reservoir tank. Refer to ST-48, "Exploded View".
2. Disconnect heater hose at heater core side, and fit a plug onto hose end to prevent engine coolant leak-
age.
3. Disconnect ground cable.
4. Disconnect all clips and connectors of the engine harness from vehicle side.
Removal Work
1. Install alternator bracket. Refer to CHG-25, "Exploded View".
 Temporarily tighten mounting bolts.
2. Remove intake manifold. Refer to EM-30, "
Exploded View".
3. Remove starter motor. Refer to STR-17, "
Exploded View".
4. Install engine slingers.
5. Lift using a hoist and secure the engine in position.
6. Remove engine mounting bracket (LH, RH) and engine mounting insulator (LH, RH). Refer to EM-98,
"Exploded View".
7. Remove the engine from the vehi cle, avoid interference with the
vehicle body.
CAUTION:
 Before and during lifting, always check that any har-
nesses are left connected.
 Never damage engine mounti ng insulator and avoid oil/
grease smearing or spills onto engine mounting insulator.
A Engine front slinger (bank 2) B Engine rear slinger C Engine front slinger (bank 1)
Slinger bolts:
: 45.0 N·m (4.6 kg-m, 33 ft-lb)
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EM-102
< UNIT REMOVAL AND INSTALLATION >
ENGINE ASSEMBLY
INSTALLATION
Install 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 mi ssing dowels may cause vibration, oil leaks or
breakage of drivetrain components.
InspectionINFOID:0000000006289578
INSPECTION AFTER INSTALLATION
Inspection for Leakage
The following are procedures for checking fluid leakage, lubricant leakage. Before starting engine, check oil/fluid levels includi ng 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, che ck again for fuel leakage at connection points.
 Run engine to check for unusual noise and vibration. NOTE:
If hydraulic pressure inside chain tensioner drops af ter 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 applic able 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
Exhaust gases — Leakage —
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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CYLINDER BLOCKEM-111
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b. Install thrust bearings (2) to both sides of the No. 3 journal hous-
ing on cylinder block (1).
 Install thrust bearings with the oil groove (A) facing crankshaftarm (outside).
c. Install main bearings paying attention to the direction.  Main bearing with oil hole (B) and groove (C) goes on cylinderblock. The one without them goes on main bearing cap.
 Before installing main bearings, apply engine oil to the bearing surface (inside). Do not apply engine oil to the back surface,
but thoroughly clean it.
 When installing, align main bearing stopper protrusion to cut-
out of cylinder block and main bearing.
 Ensure the oil holes on cylinder block and those on the corre-
sponding bearing are aligned.
5. Install crankshaft to cylinder block.  While turning crankshaft by hand, check that it turns smoothly.
6. Install main bearing caps as per the following:  Align the identification number to the journal position to install.
 Install it with the front mark (indicated by stamping) facing thefront of engine.
 Using plastic hammer or similar tool, tap them lightly to seat them on the installation position.
NOTE:
Main bearing cap cannot be replaced as a single parts,
because it is machined together with cylinder block.
7. Install each main bearing cap bolts as per the following: CAUTION:
If main bearing cap bolts and sub bolts are re-u sed, check their outer diameters before installa-
tion. Refer to EM-115, "
Inspection".
a. Apply new engine oil to threads and seat surfaces of main bearing cap bolts and sub bolts.
b. Tighten all bolts in order of (No. 1 - 30) temporarily.
c. Tighten main bearing cap bolts (M12) in order of No. 1 - 10.
d. Tighten main bearing cap sub bolts (M9) in order of No. 11 - 20.
3 : Main bearing (uppe r) (cylinder block side)
4 : Crankshaft
5 : Main bearing (lower) (main bearing cap side)
: Engine front
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: Engine front
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: Engine front
: 39.2 N·m (4.0 kg-m, 29 ft-lb)
: 29.4 N·m (3.0 kg-m, 22 ft-lb)
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EM-112
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
e. Tighten main bearing cap bolts (M12) in order of No. 1 - 10(clockwise).
CAUTION:
Use the angle wrench [SST: KV10112100 (BT8653-A)] (A) to
check tightening angl e. Never make judgment by visual
inspection.
f. Tighten main bearing cap sub bolts (M9) in order of No. 11 - 20. (clockwise)
g. Tighten side bolts (M10) in order of No. 21 - 30.  After installing bolts, check that crankshaft can be rotated smoothly by hand.
 Check the crankshaft end play. Refer to EM-137, "
CylinderBlock".
8. Install rear oil seal retainer.  Apply a continuous bead of liquid gasket with tube presser
(commercial service tool) to rear oil seal retainer as shown in
the figure.
Use Genuine RTV silicone seal ant or equivalent. Refer to
GI-22, "
Recommended Chemical Products and Sealants".
9. Install rear oil seal on rear oil seal retainer.
 Apply new engine oil to both oil seal lip (A) and dust seal lip(B).
 Install it so that each seal lip is oriented as shown in the figure. CAUTION:
Be careful not to scratch or make burrs on circumference
of oil seal.
 Press in rear oil seal (1) to the position as shown in the figure.
 Using a suitable drift [outer diameter: 101 mm (3.98 in)].
 Check the garter spring is in position and seal lips are not inverted.
10. Install piston to connecting rod as per the following: Angle tightening: 40 degrees
Angle tightening: 30 degrees
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: 49.0 N·m (5.0 kg-m, 36 ft-lb)
A : Protrusion
b : 4.0 - 5.6 mm (0.157 - 0.220 in)
c:
φ3.4 - 4.4 mm (0.134 - 0.173 in)
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: Engine inside
: Engine outside
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B : Rear oil seal retainer rear end face
a : 0 - 0.5 mm (0 - 0.020 in)
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Revision: 2010 May2011 QX56

CYLINDER BLOCKEM-113
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 Assemble so that the front mark (A) on the piston head and
the cylinder number (D) on connecting rod are positioned as
shown in the figure.
a. Using snap ring pliers, install new snap ring to the groove of pis- ton rear side.
 Insert it fully into groove to install.
b. Install piston to connecting rod.  Using an industrial use dryer or similar tool, heat piston until piston pin can be pushed in by hand without
excess force [approximately 60 to 70 °C (140 to 158 °F)]. From the front to the rear, insert piston pin into
piston and connecting rod.
c. Install new snap ring to the groove of the piston front side.  Insert it fully into groove to install.
 After installing, check that connecting rod moves smoothly.
11. Using a piston ring expander (c ommercial service tool) (A),
install piston rings.
CAUTION:
 When installing piston rings, be careful not to damage piston.
 Be careful not to damage piston rings by expending them excessively.
 If there is stamped mark on ri ng, mount it with marked side up.
 Position each ring with the gap as shown in the figure referring to the piston front mark (D).
 Check the piston ring side clearance. Refer to EM-115, "
Inspection".
12. Install connecting rod bearings to connecting rod and connecting rod bearing cap. CAUTION:
Be careful not to drop connecting r od bearing, and to scratch the surface.
B : Oil hole
C : Front mark
: Engine front
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Stamped mark: To p r i n g ( A ) : 1 K
Second ring (B) : 2 K
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C : Top ring gap
E : Oil ring upper or lower rail gap (either of them)
F : Second ring and oil ring spacer gap
a : 90 degrees
b : 45 degrees
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Revision: 2010 May2011 QX56

CYLINDER BLOCKEM-115
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f. Tighten connecting rod bolts. (clockwise)
CAUTION:
Always use the angle wrench [SST: KV10112100 (B T8653-A)]. Never make judgment by visual
inspection.
 After tightening connecting rod bolts, c heck that crankshaft rotates smoothly.
 Check the connecting rod side clearance. Refer to EM-115, "
Inspection".
16. Install knock sensors (1).  Install knock sensors in the direction shown in the figure.
 After installing knock sens or, connect harness connector, and
lay it out to front of the engine.
CAUTION:
 Never tighten mounting bolts while holding connector.
 If any impact by dropping is applied to knock sensor,
replace it with new one.
NOTE:
 Check that there is no foreign material on the cylinder block
mating surface and the back surface of knock sensor.
 Check that knock sensor does not interfere with other parts.
17. Install oil filter (for VVEL ladder assembly).
18. Install drive plate.  Install drive plate (4) and reinforcement plate (3) as shown inthe figure.
 When installing drive plate to crankshaft (1), be sure to cor- rectly align crankshaft side dowel pin and drive plate side
dowel pin hole.
CAUTION:
If these are not aligned correct ly, engine runs roughly and
“MIL” illuminates.
 Holding ring gear with the ring gear stopper [SST: KV10119200 (J-49277)].
 Tighten the mounting bolts crosswise over several times.
19. Assemble in the reverse order of disassembly.
InspectionINFOID:0000000006289584
CRANKSHAFT END PLAY
 Measure the clearance between thrust bearings and crankshaft arm when crankshaft is moved fully forward or backward with a dial
indicator (A).
 If the measured value exceeds t he limit, replace thrust bearings,
and measure again. If it still exceeds the limit, replace crankshaft
also. : 19.6 N·m (2.0 kg-m, 14.5 ft-lb)
Angle tightening: 90 degrees
: Engine front
2 : Pilot converter
A : Rounded : Engine front
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Standard and limit : Refer to EM-137, "CylinderBlock".
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Revision: 2010 May2011 QX56