2004 INFINITI QX56 height

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

EM-100Revision: August 2007
SERVICE DATA AND SPECIFICATIONS (SDS)
2004 QX56
CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
*: Total indicator reading
Valve Lifter
Unit: mm (in)
Valve Clearance
Unit: mm (in)
*: Approximately 20°C (68 °F) ItemsStandard
Camshaft runout [TIR*] Less than 0.02 (0.0008)
Camshaft cam height “A” Intake & Exhaust 44.465 - 44.655 (1.7506 - 1.7581)
Cam wear limit0.02 (0.0008)
Outside diameter of camshaft journal 25.953 - 25.970 (1.0218 - 1.0224)
Camshaft bracket inside diameter 26.000 - 26.021 (1.0236 - 1.0244)
Camshaft journal clearance 0.030 - 0.068 (0.0012 - 0.0027)
Camshaft end play 0.115 - 0.188 (0.0045 - 0.0074)
Camshaft sprocket runout [TIR*] Less than 0.15 (0.0059)
SEM 67 1
ItemsStandard
Valve lifter diameter 33.977 - 33.987 (1.3377 - 1.3381)
Valve lifter hole diameter 34.000 - 34.016 (1.3386 - 1.3392)
Clearance between lifter and lifter guide 0.013 - 0.039 (0.0005 - 0.0015)
Items Hot Cold * (reference data)
Intake 0.304 - 0.416 (0.012 - 0.016) 0.26 - 0.34 (0.010 - 0.013)
Exhaust 0.308 - 0.432 (0.012 - 0.017) 0.29 - 0.37 (0.011 - 0.015)

EM-102Revision: August 2007
SERVICE DATA AND SPECIFICATIONS (SDS)
2004 QX56
CYLINDER HEAD
Unit: mm (in)
Valve Dimensions
Unit: mm (in) Items Standard Limit
Head surface distortion 0.03 (0.0012) 0.1 (0.004)
Nominal cylinder head height “H” 126.3 (4.97)
KBIA2554E
Valve head diameter “D”Intake 37.0 - 37.3 (1.457 - 1.469)
Exhaust 31.2 - 31.5 (1.228 - 1.240)
Valve length “L”Intake 96.21- 96.71 (3.7878 - 3.8075)
Exhaust 93.74 - 94.24 (3.6905 - 3.7102)
Valve stem diameter “d”Intake 5.965 - 5.980 (0.2348 - 0.2354)
Exhaust 5.955 - 5.970 (0.2344 - 0.2350)
Valve seat angle “α”Intake
45°15′ - 45°45′
Exhaust
Valve margin “T”Intake 1.1 (0.043)
Exhaust 1.3 (0.051)
SEM188

SERVICE DATA AND SPECIFICATIONS (SDS)
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Revision: August 20072004 QX56
Valve Guide
Unit: mm (in)
Valve Seat
Unit: mm (in)
Valve Spring
Items Standard Oversize [0.2 (0.008)] (service)
Valve guideOutside diameter 10.023 - 10.034 (0.3946 - 0.3950) 10.223 - 10.234 (0.4025 - 0.4029)
Inside diameter (Finished size) 6.000 - 6.018 (0.2362 - 0.2369) —
Cylinder head valve guide hole diameter 9.975 - 9.996 (0.3927 - 0.3935) 10.175 - 10.196 (0.4006 - 0.4014)
Interference fit of valve guide 0.027 - 0.059 (0.0011 - 0.0023)
Items Standard Limit
Stem to guide clearanceIntake 0.020 - 0.053 (0.0008 - 0.0021) 0.08 (0.0031)
Exhaust 0.030 - 0.063 (0.0012 - 0.0025) 0.09 (0.0035)
Projection length “L”Intake 12.6 - 12.8 (0.496 - 0.504)
Exhaust 12.5 - 12.9 (0.492 - 0.508)
KBIA2555E
Items Standard Oversize [0.5 (0.020)] (Service)
Cylinder head seat recess diameter (D)Intake 38.000 - 38.016 (1.4961 - 1.4967) 38.500 - 38.516 (1.5157 - 1.5164)
Exhaust 32.200 - 32.216 (1.2677 - 1.2683) 32.700 - 32.716 (1.2874 - 1.2880)
Valve seat interference fitIntake 0.081 - 0.113 (0.0032 - 0.0044)
Exhaust 0.064 - 0.096 (0.0025 - 0.0038)
Valve seat diameter (d)Intake 38.097 - 38.113 (1.4999 - 1.5005) 38.597 - 38.613 (1.5196 - 1.5202)
Exhaust 32.280 - 32.296 (1.2709 - 1.2715) 32.780 - 32.796 (1.2905 - 1.2912)
KBIA2541E
Free height mm (in)50.58 (1.9913)
Pressure N (kg, lb) at height mm (in)Installation 165.8 - 187.0 (16.9 - 19.1, 37 - 42) at 37.0 (1.457)
Valve open 314.8 - 355.0 (32.1 - 36.2, 71 - 80) at 28.2 (1.110)
Out-of-square mm (in) Less than 2.2 (0.087)

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)

FFD-14
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
Disassembly and AssemblyEDS0035N
COMPONENTS
1. Side bearing adjust nut 2. Side bearing 3. Side gear thrust washer
4. Side gear 5. Lock pin 6. Pinion mate thrust washer
7. Pinion mate gear 8. Pinion mate shaft 9. Drive pinion
10. Drive pinion height adjusting washer 11. Drive pinion rear bearing 12. Collapsible spacer
13. Breather tube 14. Differential side flange 15. Dust shield
16. Circular clip 17. Side oil seal 18. Drive pinion front bearing
19. Front oil seal 20. Companion flange 21. Drive pinion nut
22. Drain plug 23. Differential side shaft 24. Axle shaft bearing
25. Extension tube 26. O-ring 27. Gear carrier
28. Plate 29. Differential case 30. Drive gear
31. Side bearing cap 32. Filler plug 33. Rear cover
SDIA3207E

FFD-22
FRONT FINAL DRIVE ASSEMBLY
Revision: August 20072004 QX56
11. Remove drive pinion rear bearing inner race and drive pinion
height adjusting washer using Tool.
INSPECTION AFTER DISASSEMBLY
Clean up the disassembled parts. Then, inspect if the parts are worn or damaged. If so, follow the measures
below.Tool number : ST30021000 ( — )
SDIA2236E
Content Conditions and Measures
Hypoid gear

If the gear teeth do not mesh or line-up correctly, determine the cause and adjust or replace as nec-
essary.

If the gears are worn, cracked, damaged, pitted or chipped (by friction) noticeably, replace with new
drive gear and drive pinion as a set.
Bearing

If any chipped (by friction), pitted, worn, rusted or scratched mark, or unusual noise from the bearing
is observed, replace as a bearing assembly (as a new set).
Side gear and Pinion mate
gear

If any cracks or damage on the surface of the tooth is found, replace.

If any worn or chipped mark on the contact sides of the thrust washer is found, replace.
Side gear thrust washer and
pinion mate thrust washer

If it is chipped (by friction), damaged, or unusually worn, replace.
Oil seal

Whenever disassembled, replace.

If wear, deterioration of adherence (sealing force lips), or damage is detected on the lips, replace
them.
Differential case

If any wear or crack on the contact sides of the differential case is found, replace.
Companion flange

If any chipped mark (about 0.1 mm, 0.004 in) or other damage on the contact sides of the lips of the
companion flange is found, replace.

FRONT FINAL DRIVE ASSEMBLY
FFD-23
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Revision: August 20072004 QX56
ADJUSTMENT AND SELECTION OF ADJUSTING WASHERS
Differential Side Gear Clearance

Assemble the differential parts if they are disassembled. Refer to FFD-28, "Differential Assembly" .
1. Place differential case straight up so that side gear to be mea-
sured comes upward.
2. Using feeler gauge, measure the clearance between side gear
back and differential case at 3 different points, while rotating
side gear. Average the 3 readings, and then measure the clear-
ance of the other side as well.
CAUTION:
To prevent side gear from tilting, insert feeler gauges with
the same thickness from both sides.
3. If the back clearance is outside the specification, use a thicker/
thinner side gear thrust washer to adjust. Refer to FFD-32, "
Side
Gear Thrust Washer" .
CAUTION:
Select a side gear thrust washer for right and left individually.
Pinion Gear Height

Drive gear and pinions are supplied in matched sets only.
Matching numbers on both pinion and drive gear are etched for
verification. If a new gear set is being used, verify the numbers
of each pinion gear and drive gear before proceeding with
assembly.

The mounting distance from the center line of the drive gear to the back face of the pinion gear for the
M205 final drive is 103.5 mm (4.0748 inches).
On the button end of each pinion, there is etched a plus (+) number, a minus (-) number, or a zero (0),
which indicates the best running position for each particular gear set. This dimension is controlled by a
selective shim between the inner pinion bearing race and pinion gear.
For example: If a pinion is etched m+8 (+3), it would require 0.08 mm (0.003 inch) less shim than a pinion
etched “0”. This means decreasing shim thickness; increases the mounting distance of the pinion to 103.6
mm (4.0778 inches). If a pinion is etched m+8 (-3), it would require adding 0.08mm (0.003 inch) more to
the shim than would be required if the pinion were etched “0”. By adding 0.08 mm (0.003 inch), the mount-
PDIA0460E
Side gear back clearance specification
: 0.20 mm (0.0079 in) or less
When the back clearance is large:
Use a thicker thrust washer.
When the back clearance is small:
Use a thinner thrust washer.
SPD8 28
SDIA2241E