service INFINITI QX56 2006 Factory Service Manual

EM-98Revision: November 2009
CYLINDER BLOCK
2006 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-82,
"ASSEMBLY" .

Measure inside diameter of main bearing housing.

If out of the standard, replace cylinder block and main bearing
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 the cylinder bore for wear, out-of-round and taper at six
different 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 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-104Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
SERVICE DATA AND SPECIFICATIONS (SDS)PFP:00030
Standard and LimitEBS00RFL
GENERAL SPECIFICATIONS
DRIVE BELTS
EXHAUST MANIFOLD
Unit: mm (in)
Cylinder arrangement
V- 8
Displacement cm
3 (cu in) 5,552 (338.80)
Bore and stroke mm (in) 98 x 92 (3.86 x 3.62)
Valve arrangement DOHC
Firing order 1-8-7-3-6-5-4-2
Number of piston rings Compression
2
Oil 1
Number of main bearings 5
Compression ratio 9.8:1
Compression pressure
kPa (kg/cm
2 , psi)/rpm Standard 1,520 (15.5, 220)/200
Minimum 1,324 (13.5, 192)/200
Differential limit between cylinders 98 (1.0, 14)/200
Cylinder number
Va l v e t i m i n g Unit: degree
abcde f
232 ° 230° 2° 48° 3° 49°
SEM957C
PBIC0187E
Tension of drive belts Auto adjustment by auto tensioner
Items Limit
Surface distortion Exhaust manifold 0.3 (0.012)

SERVICE DATA AND SPECIFICATIONS (SDS)EM-105
C
DE
F
G H
I
J
K L
M A
EM
Revision: November 2009 2006 QX56
CAMSHAFT AND CAMSHAFT BEARING
Unit: mm (in)
*: Total indicator reading
Valve Lifter
Unit: mm (in)
Valve Clearance
Unit: mm (in)
*: Approximately 80 °C (176°F)
Items
Standard
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 limit 0.02 (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)
SEM671
Items Standard
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
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-106Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
Available Valve Lifter
Unit: mm (in)
Identification (stamped) Mark Thickness
N788 7.88 (0.3102)
N790 7.90 (0.3110)
N792 7.92 (0.3118)
N794 7.94 (0.3126)
N796 7.96 (0.3134)
N798 7.98 (0.3142)
N800 8.00 (0.3150)
N802 8.02 (03.157)
N804 8.04 (0.3165)
N806 8.06 (0.3173)
N808 8.08 (0.3181)
N810 8.10 (0.3189)
N812 8.12 (0.3197)
N814 8.14 (0.3205)
N816 8.16 (0.3213)
N818 8.18 (0.3220)
N820 8.20 (0.3228)
N822 8.22 (0.3236)
N824 8.24 (0.3244)
N826 8.26 (0.3252)
N828 8.28 (0.3260)
N830 8.30 (0.3268)
N832 8.32 (0.3276)
N834 8.34 (0.3283)
N836 8.36 (0.3291)
SEM758G

SERVICE DATA AND SPECIFICATIONS (SDS)EM-107
C
DE
F
G H
I
J
K L
M A
EM
Revision: November 2009 2006 QX56
CYLINDER HEAD
Unit: mm (in)
Valve Dimensions
Unit: mm (in)
Items
StandardLimit
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

EM-108Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
Valve Guide
Unit: mm (in)
Valve Seat
Unit: mm (in)
Valve Spring
ItemsStandardOversize [0.2 (0.008)] (service)
Valve guide Outside 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 StandardLimit
Stem to guide clearance Intake
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 StandardOversize [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 fit Intake
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)

SERVICE DATA AND SPECIFICATIONS (SDS)EM-109
C
DE
F
G H
I
J
K L
M A
EM
Revision: November 2009 2006 QX56
CYLINDER BLOCK
Unit: mm (in)
Surface flatness Standard
0.03 (0.0012)
LImit 0.1 (0.004)
Main bearing housing inside diameter Standard68.944 - 68.968 (2.7143 - 2.7153)
Cylinder bore diameter StandardGrade No. 1
98.000 - 98.010 (3.8583 - 3.8587)
Grade No. 2 98.010 - 98.020 (3.8587 - 3.8590)
Grade No. 3 98.020 - 98.030 (3.8590 - 3.8594)
Wear limit 0.20 (0.0079)
Out-of-round (Difference between ″X ″ and ″Y ″)
Limit 0.015 (0.0006)
Taper (Difference between ″A ″ and ″C ″) 0.010 (0.0004)
Main journal inside diameter grade (Without bearing) Grade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 4
Grade No. 768.944 - 68.945 (2.7143 - 2.7144)
68.945 - 68.946 (2.7144 - 2.7144)
68.946 - 68.947 (2.7144 - 2.7144)
68.947 - 68.948 (2.7144 - 2.7145)
68.948 - 68.949 (2.7145 - 2.7145)
68.949 - 68.950 (2.7145 - 2.7146)
68.950 - 68.951 (2.7146 - 2.7146)
68.951 - 68.952 (2.7146 - 2.7146)
68.952 - 68.953 (2.7146 - 2.7147)
68.953 - 68.954 (2.7147 - 2.7147)
68.954 - 68.955 (2.7147 - 2.7148)
68.955 - 68.956 (2.7148 - 2.7148)
68.956 - 68.957 (2.7148 - 2.7148)
68.957 - 68.958 (2.7148 - 2.7149)
68.958 - 68.959 (2.7149 - 2.7149)
68.959 - 68.960 (2.7149 - 2.7150)
68.960 - 68.961 (2.7150 - 2.7150)
68.961 - 68.962 (2.7150 - 2.7150)
68.962 - 68.963 (2.7150 - 2.7151)
68.963 - 68.964 (2.7151 - 2.7151)
68.964 - 68.965 (2.7151 - 2.7152)
68.965 - 68.966 (2.7152 - 2.7152)
68.966 - 68.967 (2.7152 - 2.7152)
68.967 - 68.968 (2.7152 - 2.7153)
Difference in bore diameter between cylinders Standard Less than 0.03 (0.0012)
PBIC0123E

EM-110Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
PISTON, PISTON RING AND PISTON PIN
Available Piston
Unit: mm (in)
Piston Ring
Unit: mm (in)
Piston Pin
Unit: mm (in)
CONNECTING ROD
Unit: mm (in)
Items
StandardLimit
Piston skirt diameter “A ” Grade No. 1 97.980 - 97.990 (3.8575 - 3.8579)
—
Grade No. 2 97.990 - 98.000 (3.8579 - 3.8583) —
Grade No. 3 98.000 - 98.010 (3.8583 - 3.8587) —
Grade No. 0
(Service) 98.180 - 98.210 (3.8653 - 3.8665)
0.20 (0.0079)
“ H ” dimension 39 (1.54)—
Piston pin hole diameter Grade No. 0 21.993 - 21.999 (0.8659 - 0.8661) —
Piston to cylinder bore clearance 0.010 - 0.030 (0.0004 - 0.0012)0.08 (0.0031)
PBIC0188E
Items StandardLimit
Side clearance Top
0.035 - 0.085 (0.0014 - 0.0033) 0.11 (0.0043)
2nd 0.030 - 0.070 (0.0012 - 0.0028) 0.10 (0.0039)
Oil ring 0.015 - 0.050 (0.0006 - 0.0020) —
End gap Top
0.23 - 0.33 (0.0091 - 0.0130) 0.56 (0.0220)
2nd 0.25 - 0.40 (0.0098 - 0.0157) 0.52 (0.0205)
Oil ring 0.20 - 0.60 (0.0079 - 0.0236) 0.96 (0.0378)
Items Standard
Piston pin diameter Grade No. 0 21.989 - 21.995 (0.8657 - 0.8659)
Piston to piston pin clearance 0.002 - 0.006 (0.0001 - 0.0002)
Connecting rod bushing oil clearance 0.005 - 0.017 (0.0002 - 0.0007)
Items StandardLimit
Center distance 154.45 - 154.55 (6.08 - 6.08)—
Bend [per 100 (3.94)] —0.15 (0.0059)
Torsion [per 100 (3.94)] —0.30 (0.0118)
Connecting rod bushing inside diameter*
(small end) Grade No. 0 22.000 - 22.006 (0.8661 - 0.8664)
—
Connecting rod big end inside diameter (without bearing) 57.000 - 57.013 (2.2441 - 2.2446) —

SERVICE DATA AND SPECIFICATIONS (SDS)EM-111
C
DE
F
G H
I
J
K L
M A
EM
Revision: November 2009 2006 QX56
*: After installing in connecting rod
CRANKSHAFT
Unit: mm (in)
Side clearance
0.20 - 0.40 (0.0079 - 0.0157)0.40 (0.0157)
Connecting rod bearing housing Grade No. 0
Grade No. 1
Grade No. 2
Grade No. 3
Grade No. 4
Grade No. 5
Grade No. 6
Grade No. 7
Grade No. 8
Grade No. 9
Grade No. A
Grade No. B
Grade No. C57.000 - 57.001 (2.2441 - 2.2441)
57.001 - 57.002 (2.2441 - 2.2442)
57.002 - 57.003 (2.2442 - 2.2442)
57.003 - 57.004 (2.2442 - 2.2443)
57.004 - 57.005 (2.2443 - 2.2443)
57.005 - 57.006 (2.2443 - 2.2443)
57.006 - 57.007 (2.2443 - 2.2444)
57.007 - 57.008 (2.2444 - 2.2444)
57.008 - 57.009 (2.2444 - 2.2444)
57.009 - 57.010 (2.2444 - 2.2445)
57.010 - 57.011 (2.2445 - 2.2445)
57.011 - 57.012 (2.2445 - 2.2446)
57.012 - 57.013 (2.2446 - 2.2446)
Main journal dia. “Dm ” grade (No. 1 and 5) Standard Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 1
Grade No. 2
Grade No. 3
Grade No. 4
Grade No. 5
Grade No. 6
Grade No. 7
Grade No. 963.963 - 63.964 (2.5182 - 2.5183)
63.962 - 63.963 (2.5182 - 2.5182)
63.961 - 63.962 (2.5181 - 2.5182)
63.960 - 63.961 (2.5181 - 2.5181)
63.959 - 63.960 (2.5181 - 2.5181)
63.958 - 63.959 (2.5180 - 2.5181)
63.957 - 63.958 (2.5180 - 2.5180)
63.956 - 63.957 (2.5179 - 2.5180)
63.955 - 63.956 (2.5179 - 2.5179)
63.954 - 63.955 (2.5179 - 2.5179)
63.953 - 63.954 (2.5178 - 2.5179)
63.952 - 63.953 (2.5178 - 2.5178)
63.951 - 63.952 (2.5178 - 2.5178)
63.950 - 63.951 (2.5177 - 2.5178)
63.949 - 63.950 (2.5177 - 2.5177)
63.948 - 63.949 (2.5176 - 2.5177)
63.947 - 63.948 (2.5176 - 2.5176)
63.946 - 63.947 (2.5176 - 2.5176)
63.945 - 63.946 (2.5175 - 2.5176)
63.944 - 63.945 (2.5175 - 2.5175)
63.943 - 63.944 (2.5174 - 2.5175)
63.942 - 63.943 (2.5174 - 2.5174)
63.941 - 63.942 (2.5174 - 2.5174)
63.940 - 63.941 (2.5173 - 2.5174)
SEM645PBIC1686E

EM-112Revision: November 2009
SERVICE DATA AND SPECIFICATIONS (SDS)
2006 QX56
*: Total indicator reading
MAIN BEARING
Unit: mm (in)
Main journal dia.
“Dm ” grade (No. 2, 3 and 4) StandardGrade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 1
Grade No. 2 63.963 - 63.964 (2.5182 - 2.5183)
63.962 - 63.963 (2.5182 - 2.5182)
63.961 - 63.962 (2.5181 - 2.5182)
63.960 - 63.961 (2.5181 - 2.5181)
63.959 - 63.960 (2.5181 - 2.5181)
63.958 - 63.959 (2.5180 - 2.5181)
63.957 - 63.958 (2.5180 - 2.5180)
63.956 - 63.957 (2.5179 - 2.5180)
63.955 - 63.956 (2.5179 - 2.5179)
63.954 - 63.955 (2.5179 - 2.5179)
63.953 - 63.954 (2.5178 - 2.5179)
63.952 - 63.953 (2.5178 - 2.5178)
63.951 - 63.952 (2.5178 - 2.5178)
63.950 - 63.951 (2.5177 - 2.5178)
63.949 - 63.950 (2.5177 - 2.5177)
63.948 - 63.949 (2.5176 - 2.5177)
63.947 - 63.948 (2.5176 - 2.5176)
63.946 - 63.947 (2.5176 - 2.5176)
63.945 - 63.946 (2.5175 - 2.5176)
63.944 - 63.945 (2.5175 - 2.5175)
63.943 - 63.944 (2.5174 - 2.5175)
63.942 - 63.943 (2.5174 - 2.5174)
63.941 - 63.942 (2.5174 - 2.5174)
63.940 - 63.941 (2.5173 - 2.5174)
Pin journal dia. “Dp ” StandardGrade No. 0 53.968 - 53.974 (2.1247 - 2.1250)
Grade No. 1 53.962 - 53.968 (2.1245 - 2.1247)
Grade No. 2 53.956 - 53.962 (2.1243 - 2.1245)
Center distance “r ” 45.96 - 46.04 (1.8094 - 1.8126)
Out-of-round (Difference between ″X ″ and ″Y ″)
Limit 0.002 (0.0001)
Taper (Difference between ″A ″ and ″B ″) 0.002 (0.0001)
Runout [TIR*] Less than 0.05 (0.002)
Crankshaft end play Standard
0.10 - 0.26 (0.0039 - 0.0102)
Limit 0.30 (0.0118)
Grade number UPR/LWR Thickness Identification color Remarks
PBIC0189E