Nissan Pathfinder (2009 year). Manual - part 398

ENGINE UNIT

EM-241

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

specified torque with main bearings installed, the tip end of the
bearing must protrude. Refer to 

EM-225, "Disassembly and

Assembly"

 for the tightening procedure.

• If standard is not met, replace main bearings.

CRUSH HEIGHT OF CONNECTING ROD BEARING

• When connecting rod bearing cap is removed after being tightened

to the specified torque with the connecting rod bearings installed,
the tip end of the bearing must protrude. Refer to 

EM-225, "Disas-

sembly and Assembly"

 for tightening procedure.

• If standard is not met, replace connecting rod bearings.

MAIN BEARING CAP BOLT DIAMETER

• Check for bolts (M9 and M12) installed from lower side using the

following procedure.
NOTE:
• Side bolt (M10) is outside the target.
• Figure shows M12 bolt.

• Measure bolt diameter (d1) from tip of the bolt to dimension (a).
• Measure bolt diameter (d2) from the dimension between tip of the

bolt and dimension (b) as base station to dimension (c).
NOTE:
 If a narrower part in the threads is determined by visual check,
measure (d2) at that point.

• Calculate the difference between (d1) and (d2).

M9 bolt

M12 bolt

• Replace applicable bolts if outside the limit.

CONNECTING ROD BOLT DIAMETER

Standard

: There must be crush height

SEM502G

Standard

: There must be crush height.

PBIC1646E

KBIA2497E

Dimension (a)

: 9 mm (0.35 in)

Dimension (b)

: 15 mm (0.59 in)

Dimension (c)

: 20 mm (0.79 in)

Limit

: 0.10 mm (0.0039 in)

Dimension (a)

: 12 mm (0.47 in)

Dimension (b)

: 55 mm (2.17 in)

Dimension (c)

: 20 mm (0.79 in)

Limit

: 0.15 mm (0.0059 in)

2009 Pathfinder

EM-242

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ENGINE UNIT

• Measure diameter 

″

d

″

 at position shown.

• When “d” is out of specifications (when it becomes thinner),

replace bolt with a new one.

DRIVE PLATE 

• Check drive plate and signal plate for deformation or cracks.

CAUTION:

• Do not disassemble drive plate.
• Do not 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 anything is found, replace drive plate.

Limit

: 7.75 mm (0.3051 in) or less.

SBIA0286E

PBIC2938E

2009 Pathfinder

HOW TO SELECT PISTON AND BEARING

EM-243

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HOW TO SELECT PISTON AND BEARING

How to Select Piston and Bearing

INFOID:0000000003939578

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 PISTON

Piston Selective Fitting 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.

Connecting points

Connecting 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 (Housing inside diame-
ter) and crankshaft journal 
grade (journal outside diameter)

Between crankshaft to connect-
ing rod

Connecting rod bearing

Connecting rod bearing grade 
(bearing thickness)

Connecting rod bearing grade = 
crankshaft pin grade (pin diam-
eter).   No grade exists for inside 
diameter of connecting rod 
large end.

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 diameter)

Piston grade = cylinder bore 
grade (diameter of bore)

*Between piston to connecting 
rod

—

—

—

KBIA2495E

KBIA2496E

2009 Pathfinder

EM-244

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HOW TO SELECT PISTON AND BEARING

When Cylinder Block is Reused

1.

Measure cylinder block bore diameter.

2.

Determine the bore grade by comparing the measurement with the values under the “Cylinder bore diam-
eter” of the piston selection table. 

Piston Selection Table

Unit: mm (in)

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 CONNECTING ROD BEARING

When New Connecting Rod and Crankshaft are Used

1.

Apply the big end inside diameter grade stamped on the con-
necting rod side face to the row in the “Connecting Rod Bearing
Selection Table”.

2.

Apply the pin diameter grade stamped on the crankshaft front
side to the column in the “Connecting Rod Bearing Selection
Table”.

3.

Read the symbol at the cross point of the selected row and col-
umn in the “Connecting Rod Bearing Selection Table”.

4.

Apply the symbol obtained to the "Connecting Rod Bearing
Grade Table" to select.

When Crankshaft and Connecting Rod are Reused

1.

Measure dimensions of the big end inside diameter of the connecting rod and diameter of the crankshaft
pin individually.

2.

Apply the measured dimension to the “Connecting Rod Bearing Selection Table”.

3.

The following steps are the same as in “When New Connecting Rod and Crankshaft are Used”.

Grade number (Mark)

1

2

3

Cylinder bore diameter

98.000-98.010 (3.8583-3.8587)

98.010-98.020 (3.8587-3.8590)

93.020-98.030 (3.8590-3.8594)

Piston 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)

KBIA2536E

PBIC0110E

2009 Pathfinder

HOW TO SELECT PISTON AND BEARING

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Connecting Rod Bearing Selection Table

Connecting Rod Bearing Grade Table.

Undersize Bearings Usage Guide

• When the specified oil clearance is not obtained with standard size connecting rod bearings, use undersize

(US) bearings.

• When using undersize bearing, measure the bearing inside diameter with the 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, keep
the fillet R (All crankshaft pins).

HOW TO SELECT MAIN BEARING

When New Cylinder Block and Crankshaft are Used

1.

Apply the main bearing housing grade on the bottom face of the
cylinder block to the row in "Main Bearings Selection Table".

KBIA2538E

Grade number

Thickness “T”

mm (in)

Identification color (mark)

0

1.500 - 1.503 (0.0591 - 0.0592)

Black

1

1.503 - 1.506 (0.0592 - 0.0593)

Brown

2

1.506 - 1.509 (0.0593 - 0.0594)

Green

3

1.509 - 1.512 (0.0594 - 0.0595)

Yellow

Undersize

Thickness

0.25 (0.0098)

1.627 - 1.635 (0.0641 - 0.0644)

Fillet R

: 1.5 - 1.7 mm (0.059 - 0.067 in)

PBIC0111E

KBIA2495E

2009 Pathfinder

EM-246

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HOW TO SELECT PISTON AND BEARING

2.

Apply the journal diameter grade on the crankshaft front to the
column in "Main Bearings Selection Table".

3.

Read the symbol at the cross point of the selected row and column in the "Main Bearings Selection Table".

CAUTION:

• Initial clearance for No. 1, 5 journal and No. 2, 3, 4 journal is different. Use two different selection

lists for each part. 

• No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Do not con-

fuse them. 

4.

Apply the symbol to the "Main Bearings Grade Table" to select.
NOTE:
• Grade list applies to all journals.
• Service parts are available as a set of both upper and lower.

When Cylinder Block and Crankshaft are Reused

1.

Measure the inside diameter of the cylinder block main bearings housing and the outside diameter of the
crankshaft journal.

2.

Apply measurement in above step 1 to "Main Bearings Selection Table".

3.

The following steps are same as in “When New Cylinder Block and Crankshaft are Used”.

PBIC0110E

2009 Pathfinder

HOW TO SELECT PISTON AND BEARING

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Main Bearings Selection Table (No. 1 and No. 5 journal)

WBIA0608E

2009 Pathfinder

EM-248

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HOW TO SELECT PISTON AND BEARING

Main Bearings Selection Table (No. 2, 3 and 4 journal)

Main Bearings Grade Table (All Journals)

Unit: mm (in)

WBIA0609E

Grade number

UPR/LWR

Thickness 

Identification color

Remarks

0

—

2.483 - 2.486 (0.0978 - 0.0979)

Black

Grade is the same for upper 
and lower bearings.

1

—

2.486 - 2.489 (0.0979 - 0.0980)

Brown

2

—

2.489 - 2.492 (0.0980 - 0.0981)

Green

3

—

2.492 - 2.495 (0.0981 - 0.0982)

Yellow

4

—

2.495 - 2.498 (0.0982 - 0.0983)

Blue

5

—

2.498 - 2.501 (0.0983 - 0.0985)

Pink

6

—

2.501 - 2.504 (0.0985 - 0.0986)

Purple

7

—

2.504 - 2.507 (0.0986 - 0.0987)

White            

8

—

2.507 - 2.510 (0.0987 - 0.0988)

Red

2009 Pathfinder