Infiniti QX56 (JA60). Manual - part 487

 

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Infiniti QX56 (JA60). Manual - part 487

 

 

EM-102

< DISASSEMBLY AND ASSEMBLY >

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)

98.020-98.030 (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

HOW TO SELECT PISTON AND BEARING

EM-103

< DISASSEMBLY AND ASSEMBLY >

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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

EM-104

< DISASSEMBLY AND ASSEMBLY >

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

HOW TO SELECT PISTON AND BEARING

EM-105

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

WBIA0608E

 

 

 

 

 

 

 

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