Infiniti M45 (Y34). Manual — part 539
CYLINDER BLOCK
EM-93
C
D
E
F
G
H
I
J
K
L
M
A
EM
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
EM-95
C
D
E
F
G
H
I
J
K
L
M
A
EM
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)
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