Nissan Murano Z51. Manual - part 667

EM-140

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HOW TO SELECT PISTON AND BEARING

HOW TO SELECT PISTON AND BEARING

Description

INFOID:0000000005515974

 *: 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

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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 

EM-130, "Inspection"

.

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*

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—

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HOW TO SELECT PISTON AND BEARING

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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

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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-130, "Inspection"

.

2.

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

3.

Measure the crankshaft pin journal diameter. Refer to 

EM-130, "Inspection"

.

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

Unit: mm (in)

A

: Piston grade number

B

: Front mark

C

: Piston pin grade number

D

: Identification code

JPBIA2199ZZ

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

JPBIA0269ZZ

Connecting rod big end diameter

55.000 - 55.013 (2.1654 - 2.1659)

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HOW TO SELECT PISTON AND BEARING

Unit: mm (in)

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)].

Main Bearing

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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.

Crankshaft

Connecting rod bearing

Crankshaft pin journal diameter

Grade (Mark)

Dimension (Bearing thickness range)

Bearing grade No.

Color

51.968 - 51.974 (2.0460 - 2.0462)

0

1.500 - 1.503 (0.0591 - 0.0592)

STD 0

Black

51.962 - 51.968 (2.0457 - 2.0460)

1

1.503 - 1.506 (0.0592 - 0.0593)

STD 1

Brown

51.956 - 51.962 (2.0455 - 2.0457)

2

1.506 - 1.509 (0.0593 - 0.0594)

STD 2

Green

Connecting rod bearing grade table

: Refer to 

EM-154, "Connecting Rod Bearing"

.

Bearing undersize 
table

: Refer to 

EM-154, 

"Connecting Rod Bearing"

.

JPBIA0216ZZ

SEM756G

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

JPBIA0269ZZ

HOW TO SELECT PISTON AND BEARING

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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 

EM-130, "Inspection"

.

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”.

MAIN BEARING SELECTION TABLE

MAIN BEARING GRADE TABLE (ALL JOURNALS)

J

: Pin diameter grade No. 6

K

: Identification code

PBIC5332E

Main bearing grade table (All journals)

: Refer to 

EM-153, "Main Bearing"

.