Infiniti QX56 (Z62). Manual - part 672

EM-128

< UNIT DISASSEMBLY AND ASSEMBLY >

HOW TO SELECT PISTON AND BEARING

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

INFOID:0000000006289588

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 BEARING SELECTION
TABLE”.

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 SELEC-
TION TABLE”.

CAUTION:

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

table for each part. 

• No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Never con-

fuse.

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 are 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-115, "Inspection"

.

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Bearing undersize table

: Refer to 

EM-142, "Connecting Rod Bearing"

.

KBIA2495E

A

: Pin diameter grade No. 1

B

: Pin diameter grade No. 2

C

: Pin diameter grade No. 3

D

: Pin diameter grade No. 4

E

: Journal diameter grade No. 1

F

: Journal diameter grade No. 2

G

: Journal diameter grade No. 3

H

: Journal diameter grade No. 4

I

: Journal diameter grade No. 5

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HOW TO SELECT PISTON AND BEARING

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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 from step 3 in “When New Cylinder Block and Crankshaft are Used”.

MAIN BEARING SELECTION TABLE (No. 1 and 5 Journal)

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EM-130

< UNIT DISASSEMBLY AND ASSEMBLY >

HOW TO SELECT PISTON AND BEARING

MAIN BEARING SELECTION TABLE (No. 2, 3 and 4 Journal)

MAIN BEARING GRADE TABLE (ALL JOURNALS)

UNDERSIZE BEARING USAGE GUIDE

• When the specified main bearing oil clearance is not obtained with standard size main bearings, use under-

side (US) bearing.

• When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and

grind main journal so that the main bearing oil clearance satisfies the standard.

CAUTION:

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Main bearing grade table (All journals)

: Refer to 

EM-141, "Main Bearing"

.

HOW TO SELECT PISTON AND BEARING

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

JPBIA0216ZZ

Bearing undersize table

: Refer to 

EM-141, "Main Bearing"

.