Nissan Pathfinder (2008 year). Manual - part 370

ENGINE UNIT

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• Measure the outer diameter of crankshaft pin journal with

micrometer.

• If out of the standard, measure the connecting rod bearing oil

clearance. Then use undersize bearing. Follow the "CONNECT-
ING ROD BEARING OIL CLEARANCE" procedure.

OUT-OF-ROUND AND TAPER OF CRANKSHAFT

• Measure the dimensions at four different points as shown on each

main journal and pin journal with micrometer. 

• Out-of-round is indicated by the difference in the dimensions

between “X” and “Y” at “A” and “B”.

• Taper is indicated by the difference in the dimensions between “A”

and “B” at “X” and “Y”.

• If the measured value exceeds the limit, correct or replace crankshaft.
• If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select

the main bearing and/or connecting rod bearing. Follow the "MAIN BEARING OIL CLEARANCE" and/or
"CONNECTING ROD BEARING OIL CLEARANCE" procedures.

CRANKSHAFT RUNOUT

• Place V-block on precise flat table, and support the journals on the

both end of crankshaft.

• Place dial indicator straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on dial

indicator. (Total indicator reading)

• If it exceeds the limit, replace crankshaft.

CONNECTING ROD BEARING OIL CLEARANCE

Method by Calculation

• Install connecting rod bearings to connecting rod and cap, and

tighten connecting rod bolts to the specified torque. Refer to 

EM-

106, "Disassembly and Assembly"

 for the tightening procedure.

• Measure the inner diameter of connecting rod bearing with inside

micrometer.

(Bearing oil clearance) = (Connecting rod bearing inner diameter) –
(Crankshaft pin journal diameter)

Standard

: 53.956 - 53.974 mm (2.1242 - 2.1250 in) dia.

PBIC0127E

Limit:

Out-of-round (Difference between “X” and “Y”)

: 0.002 mm (0.0001 in)

Taper (Difference between “A” and “B”)

: 0.002 mm (0.0001 in)

SBIA0535E

Standard

: Less than 0.05 mm (0.002 in)

Limit

: 0.10 mm (0.0039 in)

SEM346D

Standard

: 0.034 - 0.059 mm (0.0013 - 0.0023 in) (actu-

al clearance)

Limit

: 0.070 mm (0.0028 in)

PBIC1642E

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ENGINE UNIT

• If the calculated value exceeds the limit, select proper connecting rod bearing according to connecting rod

big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance. Refer to

EM-127, "How to Select Piston and Bearing"

.

Method of Using Plastigage

• Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely. 
• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install connecting rod bearings to connecting rod and cap, and tighten connecting rod bolts to the specified

torque. Refer to 

EM-106, "Disassembly and Assembly"

 for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove connecting rod bearing cap and bearing, and using scale

on plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

MAIN BEARING OIL CLEARANCE

Method by Calculation

• Install main bearings to cylinder block and lower cylinder block,

and tighten lower cylinder block bolts to the specified torque. Refer
to 

EM-106, "Disassembly and Assembly"

 for the tightening proce-

dure.

• Measure the inner diameter of main bearing with bore gauge.
(Bearing clearance) = (Main bearing inner diameter) – (Crankshaft
main journal diameter)

• If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diame-

ter and crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to 

EM-127, "How to

Select Piston and Bearing"

.

Method of Using Plastigage

• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil

holes.

• Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the

specified torque. Refer to 

EM-106, "Disassembly and Assembly"

 for the tightening procedure.

CAUTION:

Do not rotate crankshaft.

• Remove lower cylinder block and bearings, and using scale on

plastigage bag, measure the plastigage width. 
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.

PBIC1149E

Standard

: 0.035 - 0.045 mm (0.0014 - 0.0018 in) 

(actual clearance)

Limit

: 0.065 mm (0.0026 in)

PBIC2204E

PBIC1149E

ENGINE UNIT

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CRUSH HEIGHT OF MAIN BEARING

• When lower cylinder block is removed after being tightened to the

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

EM-106, "Disassembly and Assembly"

 for

the tightening procedure.

• If the 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 connecting rod bearings installed, the
tip end of bearing must protrude. Refer to 

EM-106, "Disassembly

and Assembly"

 for the tightening procedure.

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

LOWER CYLINDER BLOCK BOLT OUTER DIAMETER

• Measure the outer diameters (“d

1

”, “d

2

”) at two positions as shown.

• If reduction appears in “A” range, regard it as “d

2

”.

• If it exceeds the limit (large difference in dimensions), replace

lower cylinder block bolt with new one.

CONNECTING ROD BOLT OUTER DIAMETER

• Measure the outer diameter “d” at position shown.
• If the reduction appears in a position other than “d”, regard it as “d”.

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

connecting rod bolt with new one.

DRIVE PLATE 

Standard

: There must be crush height.

SEM502G

Standard

: There must be crush height.

PBIC1646E

Limit (“d

1

” – “d

2

”)

: 0.11 mm (0.0051 in)

PBIC0911E

Limit

: 7.75 mm (0.3051 in)

PBIC0912E

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• 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.

OIL JET

• Check nozzle for deformation and damage.
• Blow compressed air from nozzle, and check for clogs.
• If it is not satisfied, clean or replace oil jet.

OIL JET RELIEF VALVE

• Using clean plastic stick, press check valve in oil jet relief valve.

Make sure that valve moves smoothly with proper reaction force.

• If it is not satisfied, replace oil jet relief valve.

PBIC2938E

EMU0468D

HOW TO SELECT PISTON AND BEARING

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HOW TO SELECT PISTON AND BEARING

How to Select Piston and Bearing

INFOID:0000000001281998

DESCRIPTION

 *: 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, follow the applicable procedures.

HOW TO SELECT PISTON

When New Cylinder Block is Used

Check the cylinder bore grade (“1”, “2”, or “3”) on rear side of cylin-
der 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 Cylinder Block is Reused

1.

Measure the cylinder bore inner diameter. Refer to 

EM-117, "Inspection After Disassembly"

.

2.

Determine the bore grade by comparing the measurement with
the values under the cylinder bore inner diameter of the “Piston
Selection Table”.

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*

—

—

—

PBIC2949E

PBIC2950E

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HOW TO SELECT PISTON AND BEARING

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.

HOW TO SELECT CONNECTING ROD BEARING

When New Connecting Rod and Crankshaft are Used

Check pin journal 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 Crankshaft and Connecting Rod are Reused

1.

Measure the connecting rod big end diameter. Refer to 

EM-117, "Inspection After Disassembly"

.

2.

Make sure that the connecting rod big end diameter is within the standard value.

3.

Measure the crankshaft pin journal diameter. Refer to 

EM-117, "Inspection After Disassembly"

.

4.

Determine the grade of crankshaft pin journal 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

Unit: mm (in)

Unit: mm (in)

Undersize Bearings 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:

Grade

1

2 (or no mark)

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)

PBIC2951E

Connecting rod big end diameter

57.000 - 57.013 (2.2441 - 2.2446)

Crankshaft

Connecting rod bearing

Crankshaft pin journal diameter

Grade (Mark)

Dimension (Bearing thickness range)

Bearing grade No.

Color

53.968 - 53.974 (2.1247 - 2.1250)

0

1.500 - 1.503 (0.0591 - 0.0592)

STD 0

Black

53.962 - 53.968 (2.1245 - 2.1247)

1

1.503 - 1.506 (0.0592 - 0.0593)

STD 1

Brown

53.956 - 53.962 (2.1242 - 2.1245)

2

1.506 - 1.509 (0.0593 - 0.0594)

STD 2

Green

HOW TO SELECT PISTON AND BEARING

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In grinding crankshaft pin to use undersize bearings, keep the
fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)].

Bearing undersize table

Unit: mm (in)

HOW TO SELECT MAIN BEARING

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 Selection
Table”.

When Cylinder Block and Crankshaft are Reused

1.

Measure cylinder block main bearing housing inner diameter and crankshaft main journal diameter. Refer
to 

EM-117, "Inspection After Disassembly"

 and 

EM-117, "Inspection After Disassembly"

.

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.

Select main bearing grade at the point where selected row and column meet in following selection table.

PBIC1908E

Size

Thickness

US 0.25 (0.0098)

1.626 - 1.634 (0.0640 - 0.0643)

PBIC2949E

PBIC2951E

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HOW TO SELECT PISTON AND BEARING

Main Bearing Selection Table

Main Bearing Grade Table (All Journals)

WBIA0625E

Grade number

Thickness

Unit: mm (in)

Width

Unit: mm (in)

Identification color

Remarks