2011 INFINITI QX56 Factory Service Manual

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Page 2681 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER BLOCKEM-119
< UNIT DISASSEMBLY AND ASSEMBLY >
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Measure the distortion on the cylinder block upper face at some
different points in six directions (C ), (D), (

Page 2682 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-120
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
Measure the outer diameter of piston skirt with a micrometer (A).
Piston-to-Cylinder Bore Clearance
Calculate by piston skirt diameter and cyli

Page 2683 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER BLOCKEM-121
< UNIT DISASSEMBLY AND ASSEMBLY >
C
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If out of the standard, measure the main bearing
oil clearance. Then use undersize bearing. Refer to EM-
128,

Page 2684 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-122
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
Install connecting rod bearings (1) to connecting rod (2) and con-necting rod cap, and tighten connecting rod bolts to the specified
torque.

EM-122
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
Install connecting rod bearings (1) to connecting rod (2) and con-necting rod cap, and tighten connecting rod bolts to the specified
torque. Refer to EM-107, "
Disassembly and Assembly" for the
tightening procedure.
Measure the inner diameter of connecting rod bearing with an inside micrometer.
(Oil clearance) = (Connecting rod bearing inner di ameter) – (Crankshaft pin journal diameter)
If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod
big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance. Refer to
EM-125, "
Description".
Method of Using Plastigage
Remove oil and dust on crankshaft pin journal and the 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 connecting rod bearings to connecting rod and connecting rod bearing cap, and tighten connecting
rod bolts to the specified torque. Refer to EM-107, "
Disassembly and Assembly" for the tightening proce-
dure.
CAUTION:
Never rotate crankshaft.
Remove connecting rod bearing cap and bearings, and using the
scale on the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured va lue exceeds the limit is the
same as that described in the “Method by Calculation”.
MAIN BEARING OIL CLEARANCE
Method by Calculation
Install main bearings (3) to cylinder block (1) and main bearing cap (2), and tighten main bearing cap bolts to the specified torque.
Refer to EM-107, "
Disassembly and Assembly" for the tightening
procedure.
Measure the inner diameter of main bearing with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) – (Crankshaft main
journal diameter)
If the calculated value exceeds t he limit, select proper main bear-
ing according to main bearing inner diameter and crankshaft main
journal diameter to obtain the specified bearing oil clearance.
Refer to EM-125, "
Description".
Method of Using Plastigage
Remove engine oil and dust on crankshaft journal and the surfaces of each bearing completely.
JPBIA0230ZZ
Standard and limit : Refer to EM-142, "ConnectingRodBearing".
JPBIA0231ZZ
Standard and limit : Refer to EM-141, "MainBearing".
JPBIA0232ZZ
Revision: 2010 May2011 QX56

Page 2685 of 5598

INFINITI QX56 2011 Factory Service Manual
CYLINDER BLOCKEM-123
< UNIT DISASSEMBLY AND ASSEMBLY >
C
DE
F
G H
I
J
K L
M A
EM
NP
O
Cut a plastigage slightly shorter than the bearing width,
and place it in crankshaft axial direction, avoiding

Page 2686 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-124
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
Measure the outer diameters (A), (B) at two positions as shown in
the figure.
If reduction appears in (A) range, regard it (B).
If it exc

Page 2687 of 5598

INFINITI QX56 2011 Factory Service Manual
HOW TO SELECT PISTON AND BEARINGEM-125
< UNIT DISASSEMBLY AND ASSEMBLY >
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HOW TO SELECT PISTON AND BEARING
DescriptionINFOID:0000000006289585
The identification grade

Page 2688 of 5598

INFINITI QX56 2011 Factory Service Manual
EM-126
< UNIT DISASSEMBLY AND ASSEMBLY >
HOW TO SELECT PISTON AND BEARING
2. Determine the bore grade by comparing the measurement withthe values under the cylinder bore inner diameter of the “PIS-

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