Infiniti G35 (V35) Sedan. Manual — part 634
HOW TO SELECT PISTON AND BEARING
EM-135
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HOW TO SELECT PISTON AND BEARING
Description
INFOID:0000000000956290
*: For the service parts, the grade for fitting cannot be selected between piston pin and 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.
Piston
INFOID:0000000000956291
WHEN NEW CYLINDER BLOCK IS USED
Check the cylinder bore grade (“1”, “2” or “3”) on rear side of cylinder
block, and select piston of the same grade.
NOTE:
Piston is available with piston pin as a set for the service part. (Only “0” grade piston pin is available.)
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)
Combining service grades for
connecting rod big end diame-
ter and crankshaft pin outer di-
ameter determine connecting
rod bearing selection.
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)
Between piston and connecting
rod*
—
—
—
A
: Bearing housing grade No. 1
B
: Bearing housing grade No. 2
C
: Bearing housing grade No. 3
D
: Bearing housing grade No. 4
E
: Cylinder bore grade No. 1
F
: Cylinder bore grade No. 2
G
: Cylinder bore grade No. 3
H
: Cylinder bore grade No. 4
I
: Cylinder bore grade No. 5
J
: Cylinder bore grade No. 6
K
: Identification
: Engine front
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< 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.
• Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no pis-
ton pin grades can be selected. (Only “0” grade is available.)
• No second grade mark is available on piston.
Connecting Rod Bearing
INFOID:0000000000956292
WHEN NEW CONNECTING ROD AND CRANKSHAFT ARE USED
Check pin diameter grade (“0”, “1” or “2”) on front of crankshaft, and
select connecting rod bearing of the same grade.
NOTE:
There is no grading for connecting rod big end diameter.
WHEN CONNECTING ROD AND CRANKSHAFT ARE REUSED
1.
Measure the connecting rod big end diameter. Refer to
EM-151, "Connecting Rod Bearing"
2.
Make sure that the connecting rod big end diameter is within the standard value.
3.
Measure the crankshaft pin journal diameter. Refer to
4.
Determine the grade of crankshaft pin diameter grade by corresponding to the measured dimension in
“Crankshaft pin journal diameter” column of “CONNECTING ROD BEARING SELECTION TABLE”.
5.
Select connecting rod bearing of the same grade.
CONNECTING ROD BEARING SELECTION TABLE
A
: Piston grade number
B
: Front mark
C
: Piston pin grade number
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Grade
1
2
3
Cylinder bore inner diameter
95.500 - 95.510
(3.7598 - 3.7602)
95.510 - 95.520
(3.7602- 3.7606)
95.520 - 95.530
(3.7606 - 3.7610)
Piston skirt diameter
95.480 - 95.490
(3.7590 - 3.7594)
95.490 - 95.500
(3.7594 - 3.7598)
95.500 - 95.510
(3.7598 - 3.7602)
A
: Journal diameter grade No. 1
B
: Journal diameter grade No. 2
C
: Journal diameter grade No. 3
D
: Journal diameter grade No. 4
E
: Pin diameter grade No. 1
F
: Pin diameter grade No. 2
G
: Pin diameter grade No. 3
H
: Pin diameter grade No. 4
I
: Pin diameter grade No. 5
J
: Pin diameter grade No. 6
K
: Identification
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HOW TO SELECT PISTON AND BEARING
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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:
In grinding crankshaft pin to use undersize bearings, keep the
fillet R (A) [1.5 - 1.7 mm (0.059 - 0.067 in)].
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Connecting rod bearing grade table
: Refer to
EM-151, "Connecting Rod Bearing"
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< DISASSEMBLY AND ASSEMBLY >
HOW TO SELECT PISTON AND BEARING
Main Bearing
INFOID:0000000000956293
WHEN NEW CYLINDER BLOCK AND CRANKSHAFT ARE USED
1.
“MAIN BEARING SELECTION TABLE” rows correspond to
bearing housing grade on rear left side of cylinder block.
2.
“MAIN BEARING SELECTION TABLE” columns correspond to
journal diameter grade on front side of crankshaft.
3.
Select main bearing grade at the point where selected row and column meet in “MAIN BEARING SELEC-
TION TABLE”.
4.
Apply sign at crossing in above step 3 to “MAIN BEARING GRADE TABLE”.
NOTE:
• “MAIN BEARING GRADE TABLE” applies to all journals.
• Service parts is available as a set of both upper and lower.
WHEN CYLINDER BLOCK AND CRANKSHAFT ARE REUSED
1.
Measure cylinder block main bearing housing inner diameter and crankshaft main journal diameter. Refer
to
and
2.
Correspond the measured dimension in “Cylinder block main bearing housing inner diameter” row of
“MAIN BEARING SELECTION TABLE”.
3.
Correspond the measured dimension in “Crankshaft main journal diameter” column of “MAIN BEARING
SELECTION TABLE”.
4.
Follow step 3 and later in “When New Cylinder Block and Crankshaft are Used”.
Bearing undersize table
: Refer to
EM-151, "Connecting Rod Bearing"
.
A
: Bearing housing grade No. 1
B
: Bearing housing grade No. 2
C
: Bearing housing grade No. 3
D
: Bearing housing grade No. 4
E
: Cylinder bore grade No. 1
F
: Cylinder bore grade No. 2
G
: Cylinder bore grade No. 3
H
: Cylinder bore grade No. 4
I
: Cylinder bore grade No. 5
J
: Cylinder bore grade No. 6
K
: Identification code
: Engine front
A
: Journal diameter grade No. 1
B
: Journal diameter grade No. 2
C
: Journal diameter grade No. 3
D
: Journal diameter grade No. 4
E
: Pin diameter grade No. 1
F
: Pin diameter grade No. 2
G
: Pin diameter grade No. 3
H
: Pin diameter grade No. 4
I
: Pin diameter grade No. 5
J
: Pin diameter grade No. 6
K
: Identification code
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