2006 INFINITI QX56 Factory Service Manual

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Page 1985 of 3383

INFINITI QX56 2006 Factory Service Manual EM-94Revision: November 2009
CYLINDER BLOCK
2006 QX56
Inspection After DisassemblyEBS00RFK
CRANKSHAFT END PLAY
Move the crankshaft fully forward and backward and measure
the clearance between the thr

Page 1986 of 3383

INFINITI QX56 2006 Factory Service Manual CYLINDER BLOCKEM-95
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Revision: November 2009 2006 QX56
Piston and Piston Pin Clearance
(Piston pin clearance) = (Piston pin hole diameter) – (Piston pin
diameter)
If cleara

Page 1987 of 3383

INFINITI QX56 2006 Factory Service Manual EM-96Revision: November 2009
CYLINDER BLOCK
2006 QX56
If out of specification, replace piston ring. If the gap still exceeds the limit even with a new ring, re-bore the
cylinder and use oversized pis

Page 1988 of 3383

INFINITI QX56 2006 Factory Service Manual CYLINDER BLOCKEM-97
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Piston Pin Diameter
Measure diameter of piston pin using suitable tool.
Connecting Rod Bushing Oil Clearance (Small End

Page 1989 of 3383

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.

Page 1990 of 3383

INFINITI QX56 2006 Factory Service Manual CYLINDER BLOCKEM-99
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Measure point ″H ″.
Piston to Cylinder Bore Clearance
Calculate by using diameter of the piston skirt and the cyli

Page 1991 of 3383

INFINITI QX56 2006 Factory Service Manual EM-100Revision: November 2009
CYLINDER BLOCK
2006 QX56
CRANKSHAFT PIN DIAMETER
Measure diameter of crankshaft pin using suitable tool.
If measurement is out of standard, measure connecting rod
beari

Page 1992 of 3383

INFINITI QX56 2006 Factory Service Manual CYLINDER BLOCKEM-101
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Measure inside diameter of connecting rod bearing.
(Oil clearance) = (Inside diameter of connecting rod bearing) –
(C

CYLINDER BLOCKEM-101
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Measure inside diameter of connecting rod bearing.
(Oil clearance) = (Inside diameter of connecting rod bearing) –
(Crankshaft pin diameter)
If clearance cannot be adjusted within the standard, grind crank-
shaft pin and use undersized bearing. Refer to EM-90, "
HOW
TO SELECT MAIN BEARING" .
Method of Using Plastigage
Remove oil and dust on the crankshaft pin and surfaces of each
bearing 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 bearings to the connecting rod and
connecting 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 bearing 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-82,
"ASSEMBLY" .
(Oil clearance) = (Inside diameter of main bearing) – (Crank-
shaft journal diameter)
If measured value exceeds the repair limit, select main bearings referring to the main bearing inside diam-
eter and crankshaft journal diameter, so that the oil clearance satisfies the standard. Refer to EM-90,
"HOW TO SELECT MAIN BEARING" .
Standard : 0.020 - 0.039 mm (0.0008 - 0.0015 in)
Limit : 0.055 mm (0.0022 in)
PBIC1642E
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

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