Infiniti QX56 (Z62). Manual — part 671
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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 exceeds the limit (large difference in dimensions), replace main
bearing cap sub bolts with new one.
CONNECTING ROD BOLT OUTER DIAMETER
1.
Measure the outer diameters [(a), (b) and (c)] at the position
shown in the figure.
2.
Obtain a mean value (d) of (a) and (b).
3.
Subtract (c) from (d).
4.
If it exceeds the limit (large difference in dimensions), replace the bolt with new one.
DRIVE PLATE
• Check drive plate and signal plate (A) for deformation or damage.
CAUTION:
• Never disassemble drive plate.
• Never place drive plate with signal plate facing down.
• When handling signal plate, take care not to damage or
scratch it.
• Handle signal plate in a manner that prevents it from becom-
ing magnetized.
• If damage is found, replace drive plate.
OIL JET
• Check nozzle for deformation and damage.
• Blow compressed air from nozzle, and check for clogs.
• Using a clean plastic stick, press check valve in oil jet relief valve. Check that valve moves smoothly with
proper reaction force.
• If it is not satisfied, clean or replace oil jet.
c
: 20 mm (0.79 in)
d
: 15 mm (0.59 in)
e
: 9 mm (0.35 in)
Limit [(B) – (A)]
: 0.10 mm (0.0039 in)
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a
: Value at the end of the smaller diameter of the bolt
b
: Value at the end of the smaller diameter of the bolt [opposite side of (a)]
c
: Value of the smallest diameter of the smaller of the bolt
Limit [(d) – (c)]
: 0.08 mm (0.0032 in)
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B
: Ring gear
: Engine front
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HOW TO SELECT PISTON AND BEARING
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HOW TO SELECT PISTON AND BEARING
Description
INFOID:0000000006289585
• 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.
Piston
INFOID:0000000006289586
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.
NOTE:
Piston is available with piston pin as a set for the service part.
WHEN NEW CYLINDER BLOCK IS REUSED
1.
Measure the cylinder bore inner diameter. Refer to
Selection points
Selection parts
Selection items
Selection methods
Between cylinder block and
crankshaft
Main bearing
Main bearing grade
(bearing thickness)
Determined by match of cylin-
der block bearing housing
grade (inner diameter of hous-
ing) and crankshaft journal
grade (outer diameter of jour-
nal)
Between crankshaft and con-
necting rod
Connecting rod bearing
Connecting rod bearing grade
(bearing thickness)
Determined by match of con-
necting rod big end diameter
grade (inner diameter of hous-
ing) and crankshaft pin outer di-
ameter.
Between cylinder block and pis-
ton
Piston and piston pin assembly
(Piston is available together
with piston pin as assembly.)
Piston grade
(piston skirt diameter)
Piston grade = cylinder bore
grade (inner diameter of bore)
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< UNIT DISASSEMBLY AND ASSEMBLY >
HOW TO SELECT PISTON AND BEARING
2.
Determine the bore grade by comparing the measurement with
the values under the cylinder bore inner diameter of the “PIS-
TON SELECTION TABLE”.
3.
Select piston of the same grade.
PISTON SELECTION TABLE
Unit: mm (in)
NOTE:
Piston is available together with piston pin as assembly.
Connecting Rod Bearing
INFOID:0000000006289587
WHEN NEW CONNECTING ROD AND CRANKSHAFT ARE USED
1.
Apply connecting rod big end diameter grade stamped (D) on
connecting rod side face to the row in the “CONNECTING ROD
BEARING SELECTION TABLE”.
A
: Bank 2
B
: Bank 1
C
: Front mark
D
: Piston grade number
E
: Piston pin grade number
F
: Identification code
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Grade
1
2
3
Cylinder bore inner 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 skirt 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)
A
: Sample codes
B
: Bearing stopper groove
C
: Small-end diameter grade
E
: Weight grade
F
: Cylinder No.
G
: Management code
H
: Front mark
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HOW TO SELECT PISTON AND BEARING
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2.
Apply crankshaft pin journal diameter grade stamped on crank-
shaft front side to the column in the “CONNECTING ROD
BEARING SELECTION TABLE”.
3.
Read the symbol at the cross point of selected row and column in the “CONNECTING ROD BEARING
SELECTION TABLE”.
4.
Apply the symbol obtained to the “CONNECTING ROD BEARING GRADE TABLE” to select connecting
rod bearing.
WHEN CONNECTING ROD AND CRANKSHAFT ARE REUSED
1.
Measure connecting rod big end diameter and crankshaft pin journal diameter. Refer to
2.
Correspond the measured dimension in connecting rod big end diameter row of “CONNECTING ROD
BEARING SELECTION TABLE”.
3.
Correspond the measured dimension in crankshaft pin journal diameter column of “CONNECTING ROD
BEARING SELECTION TABLE”.
4.
Follow from step 3 in “WHEN NEW CONNECTING ROD AND CRANKSHAFT ARE USED”.
CONNECTING ROD BEARING SELECTION TABLE
CONNECTING ROD BEARING GRADE TABLE
UNDERSIZE BEARING USAGE GUIDE
• When the specified connecting rod bearing oil clearance is not obtained with standard size connecting rod
bearings, use undersize (US) bearings.
• When using undersize (US) bearing, measure the connecting rod bearing inner diameter with bearing
installed, and grind crankshaft pin so that the connecting rod bearing oil clearance satisfies the standard.
CAUTION:
A
: Pin diameter grade No. 1
B
: Pin diameter grade No. 2
C
: Pin diameter grade No. 3
D
: Pin diameter grade No. 4
E
: Journal diameter grade No. 1
F
: Journal diameter grade No. 2
G
: Journal diameter grade No. 3
H
: Journal diameter grade No. 4
I
: Journal diameter grade No. 5
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Connecting rod bearing grade table
: Refer to
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