2008 INFINITI QX56 service

EM-110
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Unit: mm (in)
*: Approximately 80°C (176 °F)
Available Valve Lifter
Unit: mm (in)
*: Always check with the Parts Department for the latest parts information.
CYLINDER HEAD
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)
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
Revision: March 2010 2008 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)EM-111
< SERVICE DATA AND SPECIFICATIONS (SDS)
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Unit: mm (in)
Spark Plug Tube
Unit: mm (in)
Valve Dimensions
Unit: mm (in)
Valve Guide
Items
StandardLimit
Head surface distortion 0.03 (0.0012)0.1 (0.004)
Nominal cylinder head height “H” 126.3 (4.97)
KBIA2554E
Items Standard
Press fit height "H" 38.400 - 39.400 (1.512 - 1.551)
Standard model
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
Revision: March 2010 2008 QX56

EM-112
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Unit: mm (in)
Va l v e S e a t
Unit: mm (in)
Valve Spring
CYLINDER BLOCK
ItemsStandardOversize [0.2 (0.008)] (service)
Va l v e g u i d e 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)
Revision: March 2010 2008 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)EM-113
< SERVICE DATA AND SPECIFICATIONS (SDS)
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Unit: mm (in)
PISTON, PISTON RING AND PISTON PIN
Available Piston
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
Revision: March 2010 2008 QX56

EM -114
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Unit: mm (in)
Piston Ring
Unit: mm (in)
Piston Pin
Unit: mm (in)
CONNECTING ROD
Unit: mm (in)
ItemsStandardLimit
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) —
“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 - 0.185 (0.0006 - 0.0073) —
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)
ItemsStandardLimit
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) —
Revision: March 20102008 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)EM-115
< SERVICE DATA AND SPECIFICATIONS (SDS)
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*: 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) StandardGrade 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. 9 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)
SEM645PBIC1686E
Revision: March 2010
2008 QX56

EM-116
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
*: 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) Limit0.002 (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
Revision: March 2010 2008 QX56

SERVICE DATA AND SPECIFICATIONS (SDS)EM-117
< SERVICE DATA AND SPECIFICATIONS (SDS)
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*: Always check with the Parts Department for the latest parts information.
Undersize
Unit: mm (in)
Main Bearing Oil Clearance
Unit: mm (in)
Connecting Rod Bearing
*: Always check with the Parts Department for the latest parts information.
Undersize
0
—2.483 - 2.486 (0.0978 - 0.0979) Black
Grade is the same for upper
and lower bearings
1
—2.486 - 2.489 (0.0979 - 0.0980) Brown
2 —2.489 - 2.492 (0.0980 - 0.0981) Green
3 —2.492 - 2.495 (0.0981 - 0.0982) Yellow
4 —2.495 - 2.498 (0.0982 - 0.0983) Blue
5 —2.498 - 2.501 (0.0983 - 0.0985) Pink
6 —2.501 - 2.504 (0.0985 - 0.0986) Purple
7 —2.504 - 2.507 (0.0986 - 0.0987) White
8 —2.507 - 2.510 (0.0987 - 0.0988) Red
01 UPR
2.483 - 2.486 (0.0978 - 0.0979) Black
Grade is different for upper and
lower bearings.
LWR
2.486 - 2.489 (0.0979 - 0.0980) Brown
12 UPR
2.486 - 2.489 (0.0979 - 0.0980) Brown
LWR 2.489 - 2.492 (0.0980 - 0.0981) Green
23 UPR
2.489 - 2.492 (0.0980 - 0.0981) Green
LWR 2.492 - 2.495 (0.0981 - 0.0982) Yellow
34 UPR
2.492 - 2.495 (0.0981 - 0.0982) Yellow
LWR 2.495 - 2.498 (0.0982 - 0.0983) Blue
45 UPR
2.495 - 2.498 (0.0982 - 0.0983) Blue
LWR 2.498 - 2.501 (0.0983 - 0.0985) Pink
56 UPR
2.498 - 2.501 (0.0983 - 0.0985) Pink
LWR 2.501 - 2.504 (0.0985 - 0.0986) Purple
67 UPR
2.501 - 2.504 (0.0985 - 0.0986) Purple
LWR 2.504 - 2.507 (0.0986 - 0.0987) White
78 UPR
2.504 - 2.507 (0.0986 - 0.0987) White
LWR 2.507 - 2.510 (0.0987 - 0.0988) Red
UndersizeThickness Main journal diameter
0.25 (0.0098) 2.618 - 2.626 (0.1031 - 0.1034) Grind so that bearing clearance is the specified value.
Items StandardLimit
Main bearing oil clearance No.1 and 5
0.001 - 0.011 (0.00004 - 0.0004) 0.021 (0.0008)
No.2, 3 and 4 0.007 - 0.017 (0.0003 - 0.0007) 0.027 (0.0011)
Grade number*Thickness “T” mm (in) Identification color (mark)
0 1.500 - 1.503 (0.0591 - 0.0592) Black
1 1.503 - 1.506 (0.0592 - 0.0593) Brown
2 1.506 - 1.509 (0.0593 - 0.0594) Green
3 1.509 - 1.512 (0.0594 - 0.0595) Yellow
Revision: March 2010 2008 QX56