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Nissan Altima HL32 Hybrid. Manual - part 394

EM-90

< DISASSEMBLY AND ASSEMBLY >

[QR25DE]

CYLINDER BLOCK

• When the bearing cap is removed after being tightened to the

specified torque with main bearings installed, the tip end of bearing

must protrude.

• If the standard is not met, replace main bearings.

OUTER DIAMETER OF LOWER CYLINDER BLOCK BOLT

• Perform only with M10 (0.39 in) bolts.

• Measure outer diameters (d1, d2) at two positions as shown.

• Measure d2 at a point within area A as shown.

• When the value of d1- d2 exceeds the limit (a large difference in

dimensions), replace the bolt with a new one.

OUTER DIAMETER OF CONNECTING ROD BOLT

• Measure outer diameter (d) at position as shown.

• When (d) exceeds the limit (when it becomes thinner), replace the

bolt with a new one.

Standard

: There must be crush height.

SEM502G

Limit

: 0.13 mm (0.0051 in)

PBIC0272E

Limit

: 7.75 mm (0.3051 in) or less

PBIC0273E

HOW TO SELECT PISTON AND BEARING

EM-91

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HOW TO SELECT PISTON AND BEARING

How to Select Piston and Bearing

INFOID:0000000004211262

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 procedure.

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.

When a Cylinder Block is Reused:

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

—

ALBIA0209ZZ

SBIA0283E

EM-92

< DISASSEMBLY AND ASSEMBLY >

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HOW TO SELECT PISTON AND BEARING

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", refer to

EM-98, "Standard and Limit"

. Select the piston of the

same grade.

Piston Selection Table

• For the piston selection table, refer to

EM-98, "Standard and Limit"

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 piston pin grades can be selected. Only piston pin grade 0 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

EM-93

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Connecting Rod Bearing Selection Table

Connecting Rod Bearing Grade Table

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.

AWBIA0021GB

Grade

Upper r
thickness
mm (in)

1.496 /

1.493

(0.0589 /

0.0588)

1.499 /

1.496

(0.0590 /

0.0589)

1.502 /

1.499

(0.0591 /

0.0590)

1.505 /

1.502

(0.0593 /

0.0591)

1.508 /

1.505

(0.0594 /

0.0593

1.496 /

1.493

(0.0589 /

0.0588)

1.499 /
1.496
(0.0590 /
0.0589)

1.502 /
1.499
(0.0591 /
0.0590)

1.505 /
1.502
(0.0593 /
0.0591)

Lower
thickness
mm (in)

1.496 /
1.493
(0.0589 /
0.0588)

1.499 /
1.496
(0.0590 /
0.0589)

1.502 /
1.499
(0.0591 /
0.0590)

1.505 /
1.502
(0.0593 /
0.0591)

1.508 /
1.505
(0.0594 /
0.0593)

1.499 /
1.496
(0.0590 /
0.0589)

1.502 /
1.499
(0.0591 /
0.0590)

1.505 /
1.502
(0.0593 /
0.0591)

1.508 /
1.505
(0.0594 /
0.0593)

Identifica-
tion color

Black

Brown

Green

Yellow

Blue

Black/
Brown

Brown /
Green

Green /
Yellow

Yellow /
Blue

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