Air INFINITI QX56 2004 Factory Service Manual

CYLINDER BLOCK
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Revision: August 20072004 QX56
Inspection After DisassemblyEBS00ILZ
CRANKSHAFT END PLAY

Measure the clearance between the thrust bearings and the
crankshaft arm when the crankshaft is moved fully forward or
backward using suitable tool.

If the measured value exceeds the repair limit, replace the thrust
bearings, and measure again. If it still exceeds the repair limit,
replace the crankshaft also.
CONNECTING ROD SIDE CLEARANCE

Measure side clearance between connecting rod and crankshaft
arm using suitable tool.

If the measured value exceeds the repair limit, replace the con-
necting rod bearings, and measure again. If it still exceeds the
repair limit, replace the crankshaft also.
PISTON AND PISTON PIN CLEARANCE
Piston Pin Hole Diameter

Measure the diameter of piston pin hole using suitable tool.
Piston Pin Diameter

Measure diameter of piston pin using suitable tool.Standard : 0.10 - 0.26 mm (0.0039 - 0.0102 in)
Limit : 0.30 mm (0.0118 in)
PBIC0 114 E
Standard : 0.20 - 0.40 mm (0.0079 - 0.0157 in)
Limit : 0.40 mm (0.0157 in)
PBIC0 115 E
Standard : 21.993 - 21.999 mm (0.8659 - 0.8661 in)
PBIC0 116 E
Standard : 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0 117 E

CYLINDER BLOCK
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Revision: August 20072004 QX56
MAIN BEARING HOUSING INSIDE DIAMETER

Install the main bearing caps with the main bearings removed,
and tighten the bolts to the specified torque. Refer to EM-77,
"ASSEMBLY" .

Measure the inside diameter of the main bearing housing.

If out of the standard, replace the cylinder block and main bear-
ing caps as an assembly.
NOTE:
These components must be replaced as a single unit, because
they were processed together.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Diameter

Measure cylinder bore for wear, out-of-round and taper at six dif-
ferent points on each cylinder ("X" and "Y" directions at "A", "B"
and "C").
NOTE:
When determining cylinder bore grade, measure cylinder bore at
B position.

If the measured value exceeds the repair limit, or if there are
scratches and/or seizure on the cylinder inner wall, hone or bore the inner wall.

An oversize piston is provided. When using an oversize piston, hone the cylinder so that the clearance
between the piston and cylinder satisfies the standard.

If oversize piston is used, use it for all cylinders with oversize piston rings.
Piston Skirt Diameter

Measure piston skirt diameter using suitable tool.Standard : 68.944 - 68.968 mm (2.7143 - 2.7153 in)
PBIC1643E
PBIC0123E
Standard diameter:
98.000 - 98.030 mm (3.8583 - 3.8594 in)
Wear limit:
0.20 mm (0.0079 in)
Out-of-round (Difference between X and Y):
Limit: 0.015 mm (0.0006 in)
Taper limit (Difference between A and C):
Limit: 0.010 mm (0.0004 in)
Piston oversize Grade No. 0 (Service) : 0.20 mm (0.0079 in)
PBIC0124E
Standard : 97. 980 - 98. 010 mm (3.8575 - 3.8587 in)
PBIC0125E

EM-96Revision: August 2007
CYLINDER BLOCK
2004 QX56
Measure the inside diameter of connecting rod bearing.
(Oil clearance) = (Inside diameter of connecting rod bearing) –
(Crankshaft pin diameter)

If clearance cannot be adjusted within the standard, grind crank-
shaft pin and use undersized bearing. Refer to EM-85, "
HOW
TO SELECT MAIN BEARING" .
Method of Using Plastigage

Remove oil and dust on the crankshaft pin and the surfaces of
each bearing completely.

Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes.

Install the connecting rod bearings to the connecting rod and
connecting rod bearing cap, and tighten the connecting rod bolt
to the specified torque.
CAUTION:
Never rotate the crankshaft.

Remove the connecting rod bearing cap and bearings, and
using the scale on the plastigage bag, measure the plastigage
width.
NOTE:
The procedure when the measured value exceeds the repair limit is same as that described in “Method of
Measurement.”
MAIN BEARING OIL CLEARANCE
Method of Measurement

Install the main bearings to the cylinder block and main bearing
cap. Measure the main bearing inside diameter with the bearing
cap bolt tightened to the specified torque. Refer to EM-77,
"ASSEMBLY" .
(Oil clearance) = (Inside diameter of main bearing) – (Crank-
shaft journal diameter)

If the measured value exceeds the repair limit, select main bearings referring to the main bearing inside
diameter and crankshaft journal diameter, so that the oil clearance satisfies the standard. Refer to EM-85
.Standard : 0.020 - 0.039 mm (0.0008 - 0.0015 in)
Limit : 0.055 mm (0.0022 in)
PBIC1642E
KBIA2550E
Standard:
No. 1 and 5 journals
: 0.001 - 0.011 mm (0.00004 - 0.0004 in)
No. 2, 3 and 4 journals
: 0.007 - 0.017 mm (0.0003 - 0.0007 in)
Limit:
No.1 and 5 journals
: 0.021 mm (0.0008 in)
No. 2, 3 and 4 journals
: 0.027 mm (0.0011 in)
PBIC1644E

CYLINDER BLOCK
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Revision: August 20072004 QX56
Method of Using Plastigage

Remove oil and dust on the crankshaft journal and the surfaces
of each bearing completely.

Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes.

Install the main bearings to the cylinder block and main bearing
cap, and tighten the main bearing bolts to the specified torque.
CAUTION:
Never rotate the crankshaft.

Remove the bearing cap and bearings, and using the scale on
the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the repair limit is same as that described in “Method of
Measurement”.
CRUSH HEIGHT OF MAIN BEARING

When the bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end of bear-
ing must protrude. Refer to EM-77, "
ASSEMBLY" for the tight-
ening procedure.

If the standard is not met, replace main bearings.
CRUSH HEIGHT OF CONNECTING ROD BEARING

When the connecting rod bearing cap is removed after being
tightened to the specified torque with connecting rod bearings
installed, the tip end of bearing must protrude. Refer to EM-77,
"ASSEMBLY" for the tightening procedure.

If the standard is not met, replace connecting rod bearings.
MAIN BEARING CAP BOLT DIAMETER

Check for bolts (M9 and M12) installed from lower side using the
following procedure.
NOTE:

Side bolt (M10) is outside the target.

Figure shows M12 bolt.

Measure bolt diameter "d1" from the tip of bolt to dimension "a".

Measure bolt diameter "d2" from the dimension between the tip
of bolt and dimension "b" as base station to dimension "c".
NOTE:
Measure "d2" at that point if narrower part in the threads is
determined by visual check.

Calculate the difference between "d1" and "d2".
KBIA2551E
Standard : There must be crush height
SEM 50 2G
Standard : There must be crush height.
PBIC1646E
KBIA2497E

EXHAUST SYSTEM
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Revision: August 20072004 QX56
EXHAUST SYSTEMPFP:20100
Checking Exhaust SystemEBS00IKU
Check exhaust pipes, muffler and mounting for improper attachment, leaks, cracks, damage or deterioration.

If anything is found, repair or replace damaged parts.
Removal and InstallationEBS00IKV
Exhaust System
CAUTION:

Be sure to use genuine exhaust system parts or equivalents which are specially designed for heat
resistance, corrosion resistance, and shape.

Perform the operation with the exhaust system fully cooled. The system will be hot just after the
engine stops.

Be careful not to cut your hand on the heat insulator edge.
SM A211 A
WBIA0416E
1. Tailpipe hanger bracket 2. Tailpipe 3. Gasket
4. Main muffler 5. Right front exhaust tube 6. Ring gasket
7. Heated oxygen sensor 2 (bank 2) 8. Heated oxygen sensor 2 (bank 1) 9. Left front exhaust tube
10. Center exhaust tube 11. Muffler hanger bracket front 12. Muffler hanger bracket rear

EX-4Revision: August 2007
EXHAUST SYSTEM
2004 QX56
REMOVAL
Remove exhaust system components using power tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

Always replace exhaust gaskets with new ones when reassembling.

Before installing a new heated oxygen sensor, clean and lube the exhaust tube threads using tool.

Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; install a new one.

Do not over-torque the heated oxygen sensor. Doing so may damage the heated oxygen sensor,
resulting in the MIL coming on.

If any mounting insulator is badly deformed, repair or replace it. If deposits such as mud pile up on
the mounting insulators, clean and inspect them.

Temporarily tighten the mounting nuts on the exhaust manifold side and the mounting bolts on the
vehicle side. Check each part for interference with other components, and then tighten the nuts
and bolts to specification.
INSPECTION AFTER INSTALLATION

With the engine running, check exhaust tube joints for gas leakage and unusual noises.

Check to ensure that mounting brackets and mounting rubbers are installed properly and free from undue
stress. Improper installation could result in excessive noise and vibration. Tool number
A : — (J-43897-18)
B : — (J-43897-12)

FAX-2
PRECAUTIONS
Revision: August 20072004 QX56
PRECAUTIONSPFP:00001
PrecautionsEDS001AG
Observe the following precautions when disassembling and servicing the wheel hub and drive shafts.

Perform work in a location which is as dust-free as possible.

Before disassembling and servicing, clean the outside of parts.

Prevention of the entry of foreign objects must be taken into account during disassembly of the compo-
nent parts.

Disassembled parts must be carefully reassembled in the correct order. If work is interrupted, a clean
cover must be placed over parts.

Paper shop cloths must be used. Fabric shop cloths must not be used because of the danger of lint adher-
ing to parts.

Disassembled parts (except for rubber parts) should be cleaned with a suitable solvent which shall be
removed by blowing with air or wiping with paper shop cloths.

FAX-4
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
Revision: August 20072004 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEDS001AI
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: ApplicableReference page
FAX -1 3FA X - 7FA X - 5FA X - 5FA X - 7FA X - 5
PR-3, "
NVH Troubleshooting Chart
"
FFD-7, "
NVH Troubleshooting Chart
"
FSU-4, "
NVH Troubleshooting Chart
"
WT-3, "
NVH Troubleshooting Chart
"
WT-3, "
NVH Troubleshooting Chart
"
BR-5, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Excessive joint angle
Joint sliding resistance
Imbalance
Improper installation, looseness
Parts interference
Wheel bearing damage
PROPELLER SHAFT
FRONT FINAL DRIVE
SUSPENSION
TIRES
ROAD WHEEL
BRAKES
STEERING
SymptomNoise×× ×× ×××××××
Shake× ××× × ×××××
Vibration××××× × ×× ×
Shimmy× ×× ×××××
Shudder×××× ×××××
Poor quality ride or
handling××× ×××

DRIVE SHAFT
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Revision: August 20072004 QX56
DRIVE SHAFTPFP:39100
Removal and InstallationEDS001B5
REMOVAL
1. Remove wheel and tire using power tool.
2. Remove engine under cover using power tool.
3. Remove wheel sensor harness from mount on knuckle.
CAUTION:
Do not pull on wheel sensor harness.
4. Without disassembling the hydraulic lines, remove brake caliper using power tool. Reposition it aside with
wire. Refer to BR-22, "
Removal and Installation of Brake Caliper and Disc Rotor" .
NOTE:
Avoid depressing brake pedal while brake caliper is removed.
5. Remove coil spring and shock absorber assembly using power tool. Refer to FSU-10, "
Removal and
Installation" .
6. Separate upper link ball joint stud from steering knuckle using
Tool.

Support lower link with jack.
7. Remove cotter pin, then remove drive shaft nut.
8. Remove drive shaft mounting bolts from front final drive.
9. Remove drive shaft from wheel hub and bearing assembly.
CAUTION:

When removing drive shaft, do not apply an excessive
angle to drive shaft joint. Also be careful not to exces-
sively extend slide joint.
INSPECTION AFTER REMOVAL

Move joint up, down, left, right, and in axial direction. Check for any rough movement or significant loose-
ness.

Check boot for cracks or other damage, and for grease leakage.

If damaged, disassemble drive shaft to verify damage, and
repair or replace as necessary.
1. Cotter pin 2. Drive shaft nut 3. Drive shaft
LDIA0159E
Tool number : ST29020001 (J-24319-01)
LEIA0095E
RAA0030D

DRIVE SHAFT
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Revision: August 20072004 QX56
7. Install the boot securely into the grooves (indicated by * marks)
as shown.
CAUTION:
If there is grease on boot mounting surfaces (indicated by *
marks) of shaft and housing, boot may come off. Remove
all grease from surfaces.
8. Check that the boot installation length “L” is the length indicated
below. Insert a flat-tip screwdriver or similar tool into the big end
of the boot. Bleed air from the boot to prevent boot deformation.
CAUTION:

The boot may break if the boot installation length is less than the specified value.

Do not to touch the tip of the screwdriver to the inside of the boot.
9. Secure the big and small ends of the boot with the new boot
bands as shown.
NOTE:
Discard the old boot bands and use new ones for assembly.
10. After installing the sliding joint housing to the drive shaft, rotate the boot to check that the boot is posi-
tioned correctly. If the boot is not positioned correctly, reposition the boot and secure the boot using a new
boot band.
Wheel Side
1. Insert the Genuine NISSAN Grease or equivalent, into the joint
sub-assembly serration hole until the grease begins to ooze
from the ball groove and serration hole. Refer to MA-10, "
REC-
OMMENDED FLUIDS AND LUBRICANTS" . After inserting the
grease, use a shop cloth to wipe off the grease that has oozed
out.
2. Wrap the serrated part of the drive shaft with tape. Install the
boot band and boot onto the shaft. Do not damage the boot.
NOTE:
Discard the old boot band and boot and use a new one for
assembly.
3. Remove the protective tape wound around the serrated part of
the drive shaft.Boot installation length “L ” : 145 mm (5.71 in)
WDIA0287E
SFA39 5
SDIA11 27 E
SFA80 0