Infiniti M45 (Y34). Manual - part 539

CYLINDER BLOCK

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2.

Apply measurement in above step 1 to “Main Bearing Selection Table”.

3.

Follow step 3 and later in “When new cylinder block and crankshaft are used”.

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

PBIC2375E

EM-94

CYLINDER BLOCK

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

PBIC2376E

CYLINDER BLOCK

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Main Bearings Grade Table (All Journals)

Unit: mm (in)

Use Undersize Bearing Usage Guide

●

Use undersize (US) bearing when oil clearance with standard size main bearing is not within specification.

●

When using undersize (US) bearing, measure inner diameter of bearing installed and grind journal until oil
clearance falls within specification.

Bearing undersize table

Unit: mm (in)

CAUTION:

Do not damage fillet R [1.5 mm (0.059 in)] when grinding crank-
shaft main journal in order to use undersized bearing (All jour-
nals). 

Grade number

Thickness 

Identification color

Remarks

0

2.483 - 2.486 (0.0978 - 0.0979)

Black

Grade and color are 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

01

UPR

2.483 - 2.486 (0.0978 - 0.0979)

Black

Grade and color are different 
for upper and lower bearings.

LWR

2.486 - 2.489 (0.0979 - 0.0980)

Brown

12

UPR

2.486 - 2.489 (0.0979 - 0.0980)

Brown

LWR

2.489 - 2.492 (0.0980 - 0.0981)

Green

23

UPR

2.489 - 2.492 (0.0980 - 0.0981)

Green

LWR

2.492 - 2.495 (0.0981 - 0.0982)

Yellow

34

UPR

2.492 - 2.495 (0.0981 - 0.0982)

Yellow

LWR

2.495 - 2.498 (0.0982 - 0.0983)

Blue

45

UPR

2.495 - 2.498 (0.0982 - 0.0983)

Blue

LWR

2.498 - 2.501 (0.0983 - 0.0985)

Pink

56

UPR

2.498 - 2.501 (0.0983 - 0.0985)

Pink

LWR

2.501 - 2.504 (0.0985 - 0.0986)

Purple

67

UPR

2.501 - 2.504 (0.0985 - 0.0986)

Purple

LWR

2.504 - 2.507 (0.0986 - 0.0987)

White

        78

UPR

     2.504 - 2.507 (0.0986 - 0.0987)

 White

LWR

     2.507 - 2.510 (0.0987 - 0.0988)

Red

Size

Thickness

US          0.25 (0.0098)

2.618 - 2.626 (0.1031 - 0.1034)

PBIC2373E

EM-96

CYLINDER BLOCK

Inspection After Disassembly

ABS000M3

CRANKSHAFT END PLAY 

●

Using a dial indicator, measure the clearance between the thrust
bearings and the crankshaft arm when crankshaft is moved fully
forward or backward.

●

If the measured value exceeds the limit, replace the thrust bear-
ings, and measure again. If it still exceeds the limit, replace
crankshaft also.

CONNECTING ROD SIDE CLEARANCE

●

Measure the side clearance between connecting rod and crank-
shaft arm with feeler gauge.

●

If the measured value exceeds the limit, replace connecting rod,
and measure again. If it still exceeds the limit, replace crank-
shaft also.

PISTON AND PISTON PIN  CLEARANCE
Inner Diameter of Piston Pin

Measure the inner diameter of piston pin bore with an inside
micrometer.

Outer Diameter of Piston Pin

Measure outer diameter of piston pin with a micrometer.

Piston and Piston Pin Clearance

(Piston and piston pin clearance) = (Inner diameter of piston pin) – (Outer diameter of piston pin)

●

If the clearance exceeds the standard, replace piston/piston pin assembly.

Standard

: 0.10 - 0.25 mm (0.0039 - 0.0098 in)

Limit

: 0.30 mm (0.0118 in)

PBIC2377E

Standard

: 0.20 - 0.35 mm (0.0079 - 0.0138 in)

Limit

: 0.40 mm (0.0157 in)

PBIC0115E

Standard

: 21.993 - 22.005 mm (0.8659 - 0.8663 in)

PBIC0116E

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

Standard

: 0.002 - 0.006 mm (0.0001 - 0.0002 in)