Nissan Altima L32. Instruction — part 639
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CYLINDER BLOCK
1. Install a bolt to clutch cover mounting hole, and place a torque wrench on the extended line of the flywheel
center line.
• Tighten bolt to keep it from loosening at a force of 9.8 N·m (1 kg-m, 87 in-lb).
2. Put a mating mark on circumferences of the two flywheel
masses without applying any load (measurement standard
points).
3. Apply a force of 9.8 N·m (1 kg-m, 87 in-lb) in each direction, and
mark the movement amount on the mass on the transmission
side.
4. Measure dimensions of movement amounts (A) and (B) on cir-
cumference of the flywheel on the transmission side.
• When measured value is outside the standard, replace flywheel.
Standard
: 35 mm (1.38 in) or less
SBIA0288E
HOW TO SELECT PISTON AND BEARING
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HOW TO SELECT PISTON AND BEARING
How to Select Piston and Bearing
INFOID:0000000004202136
DESCRIPTION
*For the service parts, the grade for fitting cannot be selected between a piston pin and a 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, follow the applicable procedures.
HOW TO SELECT A PISTON
When New Cylinder Block is Used:
• Check the cylinder bore grade on rear left side of cylinder block,
and select a piston of the same grade (C).
- A: Front mark
- B: Piston pin bore grade
- D: Piston crown I.D. code stamp
• If there is a corrected stamp mark on the cylinder block, use it as a
correct reference.
Selection points
Selection parts
Selection items
Selection methods
Between cylinder block to
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 to connect-
ing rod
Connecting rod bearing
Connecting rod bearing grade
(bearing thickness)
Combining service grades for
connecting rod big end inner di-
ameter and crankshaft pin outer
diameter determine connecting
rod bearing selection
Between cylinder block to pis-
ton
Piston and piston pin assembly
(The piston is available together
with piston pin as an assembly)
Piston grade (piston outer diam-
eter)
Piston grade = cylinder bore
grade (inner diameter of bore)
*Between piston to connecting
rod
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ALBIA0209ZZ
SBIA0283E
EM-94
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HOW TO SELECT PISTON AND BEARING
When a Cylinder Block is Reused:
1. Measure the cylinder block bore inner diameter.
2. Determine the bore grade by comparing the measurement with the values under the cylinder bore inner
diameter of the "Piston Selection Table". Select the piston of the same grade.
Piston Selection Table
• For the piston selection table, refer to
.
NOTE:
• The piston is available together with piston pin as an assembly.
• The piston pin (piston pin bore) grade is provided only for the parts installed at the plant. For service parts,
no grades can be selected. Only 0 grade is available.
HOW TO SELECT A CONNECTING ROD BEARING
When New Connecting Rod and Crankshaft are Used:
1. Apply big end inside diameter grade stamped on connecting rod
side face to the row in the "Connecting Rod Bearing Selection
Table".
2. Apply pin diameter grade (B) stamped on crankshaft front side
to the column in the "Connecting Rod Bearing Selection Table".
• Journal diameter grade (A)
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 connecting rod bearing grade table
to select.
When Crankshaft and Connecting Rod are Reused:
1. Measure dimensions of the big end inner diameter of connecting rod and outer diameter of crankshaft pin
individually.
2. Apply the dimension measured to the "Connecting Rod Bearing Selection Table" below.
SBIA0282E
AWBIA0017ZZ
HOW TO SELECT PISTON AND BEARING
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Connecting Rod Bearing Selection Table
Connecting Rod Bearing Grade Table. Refer to
Undersize Bearing Usage Guide
• When the specified oil clearance is not obtained with standard size connecting rod bearing, use undersize
(US) bearing.
• When using undersize bearing, measure the bearing inner diameter with bearing installed, and grind the
crankshaft pin so that the oil clearance satisfies the standard.
Bearing Undersize Table
Unit: mm (in)
CAUTION:
In grinding the crankshaft pin to use undersize bearings, do not
damage the fillet R (All crankshaft pins).
HOW TO SELECT A MAIN BEARING
When New Cylinder Block and Crankshaft are Used:
AWBIA0021GB
Size U.S.
Thickness
0.25 (0.0098)
1.622 - 1.630 (0.0639 - 0.0642)
KBIA0148E
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