2009 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2009 Factory Service Manual EM-98
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
• Remove oil and dust on the crankshaft pin and surfaces of eachbearing completely.
• Cut a plastigage slightly shorter than the bearing width, and

EM-98
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
• Remove oil and dust on the crankshaft pin and surfaces of eachbearing completely.
• Cut a plastigage slightly shorter than the bearing width, and place
it in the crankshaft axial direction, avoiding oil holes.
• Install the connecting rod beari ngs to the connecting rod and con-
necting rod bearing cap, and tighten the connecting rod bolts to the
specified torque.
CAUTION:
Do not rotate crankshaft with plastigage installed.
• Remove the connecting rod bear ing cap and bearings. Measure
the plastigage width using the scale on the plastigage bag.
NOTE:
The procedure when the measured value exceeds the repair limit is the same as that described in “Method
of Measurement”.
MAIN BEARING OIL CLEARANCE
Method of Measurement
• Install the main bearings to the cylinder block and main bearing cap. Measure the main bearing inside diameter with the bearing
cap bolts tightened to the specified torque. Refer to EM-83, "
Disas-
sembly and Assembly".
(Oil clearance) = (Inside diameter of main bearing) – (Crankshaft
journal diameter)
• If measured value exceeds the repair limit, select main bearings referring to the main bearing inside diame-
ter and crankshaft journal diameter, so that the oil clearance satisfies the standard. Refer to EM-101, "
How
to Select Piston and Bearing".
Method of Using Plastigage
• Remove oil and dust on the crankshaft journal and 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:
Do not rotate crankshaft with plastigage installed.
• Remove bearing cap and bearings. Measure plastigage width using the scale on the plastigage bag.
NOTE:
The procedure when the measured value exceeds the repair limit
is the same as that descri bed in “Method of Measurement”.
CRUSH HEIGHT OF MAIN BEARING
KBIA2550E
Standard:
No. 1 and 5 journals : 0.001 - 0.011 mm (0.00004 - 0.0004 in)
No. 2, 3 and 4 journals : 0.007 - 0.017 mm (0.0003 - 0.0007 in)
Limit: No.1 and 5 journals : 0.021 mm (0.0008 in)
No. 2, 3 and 4 journals : 0.027 mm (0.0011 in)
PBIC1644E
KBIA2551E
Revision: December 20092009 QX56

Page 1922 of 4171

INFINITI QX56 2009 Factory Service Manual ENGINE UNITEM-99
< DISASSEMBLY AND ASSEMBLY >
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• When the bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end

Page 1923 of 4171

INFINITI QX56 2009 Factory Service Manual EM-100
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
• When “d” is out of specifications (when it becomes thinner),
replace bolt with a new one.
Limit : 7.75 mm (0.3051 in) or less.
SBIA0286E
Revisio

Page 1924 of 4171

INFINITI QX56 2009 Factory Service Manual HOW TO SELECT PISTON AND BEARINGEM-101
< DISASSEMBLY AND ASSEMBLY >
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HOW TO SELECT PISTON AND BEARING
How to Select Piston and BearingINFOID:0000000005885904
DESCRIPTION

Page 1925 of 4171

INFINITI QX56 2009 Factory Service Manual 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 wit

Page 1926 of 4171

INFINITI QX56 2009 Factory Service Manual HOW TO SELECT PISTON AND BEARINGEM-103
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Connecting Rod Bearing Selection Table
Connecting Rod Bearing Grade Table.
Undersize Bearings Usage G

Page 1927 of 4171

INFINITI QX56 2009 Factory Service Manual 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

Page 1928 of 4171

INFINITI QX56 2009 Factory Service Manual HOW TO SELECT PISTON AND BEARINGEM-105
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Main Bearings Selection Table (No. 1 and No. 5 journal)
WBIA0608E
Revision: December 20092009 QX56

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