2007 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2007 Factory Service Manual CYLINDER BLOCK
EM-87
< SERVICE INFORMATION >
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*For the service parts, the grade for fitting cannot be selected between a piston pin and a connecting rod.
(Only 0 grade

CYLINDER BLOCK
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*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 shipment 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 dimension 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, refer to the text.
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.
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
Connecting points Connecting parts Selection items Selection methods
Between cylinder block to
crankshaftMain bearingMain 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 rodConnecting rod bearingConnecting 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-
tonPiston 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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INFINITI QX56 2007 Factory Service Manual EM-88
< SERVICE INFORMATION >
CYLINDER BLOCK
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 t

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INFINITI QX56 2007 Factory Service Manual CYLINDER BLOCK
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P O Connecting Rod Bearing Selection Table
Connecting Rod Bearing Grade Table.
Undersize Bearings Usage Guide
• When the spec

Page 1860 of 3061

INFINITI QX56 2007 Factory Service Manual EM-90
< SERVICE INFORMATION >
CYLINDER BLOCK
2. Apply the journal diameter grade on the crankshaft front to the
column in "Main Bearings Selection Table".
3. Read the symbol at the cross point of the

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INFINITI QX56 2007 Factory Service Manual CYLINDER BLOCK
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P O Main Bearings Selection Table (No. 1 and No. 5 journal)
WBIA0608E

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INFINITI QX56 2007 Factory Service Manual EM-92
< SERVICE INFORMATION >
CYLINDER BLOCK
Main Bearings Selection Table (No. 2, 3 and 4 journal)
Main Bearings Grade Table (All Journals)
Unit: mm (in)
WBIA0609E
Grade number UPR/LWR Thickness Ide

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INFINITI QX56 2007 Factory Service Manual CYLINDER BLOCK
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< SERVICE INFORMATION >
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P O Use Undersize Bearing Usage Guide
• Use undersize (US) bearing when the oil clearance with standard size main bearing is

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INFINITI QX56 2007 Factory Service Manual EM-94
< SERVICE INFORMATION >
CYLINDER BLOCK
• Measure side clearance between the connecting rod and crank-
shaft arm using suitable tool.
• If measured value exceeds the repair limit, replace the

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