2009 INFINITI QX56 200

HOW TO SELECT PISTON AND BEARINGEM-101
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HOW TO SELECT PISTON AND BEARING
How to Select Piston and BearingINFOID:0000000005885904
DESCRIPTION
*For the service parts, the grade for fitting cannot be selected between a piston pin and a connecting rod.
(Only 0 grade is available.) The information at the sh
ipment from the plant is described as a reference.
• The identification grade stamped on each part is the grade for the dimension measured in new condition.
This grade cannot apply to reused parts.
• For reused or repaired parts, measure the dimens ion accurately. Determine the grade by comparing the
measurement with the values of each selection table.
• For details of the measurement method of each part , the reuse standards, and the selection method of the
selective fitting parts, follow the applicable procedures.
HOW TO SELECT PISTON
Piston Selective Fitting When New Cylinder Block is Used:
• Check the cylinder bore grade on the bottom face of the cylinder
block, and select the piston of the same grade.
Connecting points Connecting parts Selection itemsSelection methods
Between cylinder block to
crankshaft Main bearing Main bearing grade (bearing
thickness)Determined by match of cylin-
der block bearing housing
grade (Housing inside diame-
ter) and crankshaft journal
grade (journal outside diameter)
Between crankshaft to connect-
ing rod Connecting rod bearing Connecting rod bearing grade
(bearing thickness)Connecting rod bearing grade =
crankshaft pin grade (pin diam-
eter). No grade exists for inside
diameter of connecting rod
large end.
Between cylinder block to pis-
ton Piston and piston pin assembly.
The piston is available together
with piston pin as an assembly.
Piston grade (piston diameter)
Piston grade = cylinder bore
grade (diameter of bore)
*Between piston to connecting
rod ———
KBIA2495E
KBIA2496E
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EM-102
< DISASSEMBLY AND ASSEMBLY >
HOW TO SELECT PISTON AND BEARING
When Cylinder Block is Reused
1. Measure cylinder block bore diameter.
2. Determine the bore grade by comparing the measurement with the values under the “Cylinder bore diam-
eter” of the piston selection table.
Piston Selection Table
Unit: mm (in)
NOTE:
• The piston is available together with piston pin as an assembly.
• The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts, no grades can be selected (only 0 grade is available).
HOW TO SELECT CONNECTING ROD BEARING
When New Connecting Rod and Crankshaft are Used
1. Apply the big end inside diameter grade stamped on the con-
necting rod side face to the row in the “Connecting Rod Bearing
Selection Table”.
2. Apply the pin diameter grade stamped on the crankshaft front side to the column in the “Connecting Rod Bearing Selection
Table”.
3. Read the symbol at the cross point of the selected row and col-
umn in the “Connecting Rod Bearing Selection Table".
4. Apply the symbol obtained to the "Connecting Rod Bearing Grade Table" to select.
When Crankshaft and Connecting Rod are Reused
1. Measure dimensions of the big end inside diameter of the connecting rod and diameter of the crankshaftpin individually.
2. Apply the measured dimension to the “Connecting Rod Bearing Selection Table”.
3. The following steps are the same as in “When New Connecting Rod and Crankshaft are Used”.
Grade number (Mark) 12 3
Cylinder bore diameter 98.000-98.010 (3.8583-3.8587) 98.010-98.020 (3.8587-3.8590) 98.020-98.030 (3.8590-3.8594)
Piston diameter 97.980-97.990 (3.8575-3.8579) 97.990-98.000 (3.8579-3.8583) 98.000-98.010 (3.8583-3.8587)
KBIA2536E
PBIC0110E
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HOW TO SELECT PISTON AND BEARINGEM-103
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Connecting Rod Bearing Selection Table
Connecting Rod Bearing Grade Table.
Undersize Bearings Usage Guide
• When the specified oil clearance is not obtained with standard size connecting rod bearings, use undersize
(US) bearings.
• When using undersize bearing, measure the bearing inside diameter with the bearing installed, and grind the
crankshaft pin so that the oil clearance satisfies the standard.
Bearing undersize table
Unit: mm (in)
CAUTION:
In grinding the crankshaft pin to use undersize bearings, keep
the fillet R (All crankshaft pins).
HOW TO SELECT MAIN BEARING
When New Cylinder Block and Crankshaft are Used
1. Apply the main bearing housing grade on the bottom face of the cylinder block to the row in "Main Bearings Selection Table".
KBIA2538E
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
UndersizeThickness
0.25 (0.0098) 1.627 - 1.635 (0.0641 - 0.0644)
Fillet R : 1.5 - 1.7 mm (0.059 - 0.067 in)
PBIC0111E
KBIA2495E
Revision: December 20092009 QX56

EM-104
< DISASSEMBLY AND ASSEMBLY >
HOW TO SELECT PISTON AND BEARING
2. Apply the journal diameter grade on the crankshaft front to thecolumn in "Main Bearings Selection Table".
3. Read the symbol at the cross point of the selected row and column in the "Main Bearings Selection Table".
CAUTION:
• Initial clearance for No. 1, 5 journal and No. 2, 3, 4 journal is different. Use two different selection
lists for each part.
• No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Do not con-
fuse them.
4. Apply the symbol to the "Main Bearings Grade Table" to select. NOTE:
• Grade list applies to all journals.
• Service parts are available as a set of both upper and lower.
When Cylinder Block and Crankshaft are Reused
1. Measure the inside diameter of the cylinder block main bearings housing and the outside diameter of the
crankshaft journal.
2. Apply measurement in above step 1 to "Main Bearings Selection Table".
3. The following steps are same as in “When New Cylinder Block and Crankshaft are Used”.
PBIC0110E
Revision: December 20092009 QX56

HOW TO SELECT PISTON AND BEARINGEM-105
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Main Bearings Selection Table (No. 1 and No. 5 journal)
WBIA0608E
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EM-106
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HOW TO SELECT PISTON AND BEARING
Main Bearings Selection Table (No. 2, 3 and 4 journal)
Main Bearings Grade Table (All Journals)
Unit: mm (in)
WBIA0609E
Grade number UPR/LWRThickness Identification color Remarks
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
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Use Undersize Bearing Usage Guide
• Use undersize (US) bearing when the oil clearance with
standard size main bearing is not within specifica-
tion.
• When using undersize (US) bearing, measure the inside di ameter of the bearing installed and grind the jour-
nal until the oil clearance falls within specification.
Bearing undersize table
Unit: mm (in)
CAUTION:
Do not damage fillet R when grinding crankshaft journal in
order to use undersized bearing (All journals).
01 UPR
2.483 - 2.486 (0.0978 - 0.0979) Black
Grade and color are 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
0.25 (0.0098) 2.618 - 2.626 (0.1031 - 0.1034)
Fillet R : 1.5 - 1.7 mm (0.059 - 0.067 in)
PBIC0111E
Revision: December 20092009 QX56

EM-108
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Standard and LimitINFOID:0000000005885905
GENERAL SPECIFICATIONS
DRIVE BELTS
EXHAUST MANIFOLD
Cylinder arrangementV- 8
Displacement cm
3(in3) 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
Valve timing Unit: degree
abcde f
244 ° 232° -8° 60° 10° 54°
SEM957C
PBIC0187E
Tension of drive belts Auto adjustment by auto tensioner
Revision: December 20092009 QX56