Infiniti M45 (Y34). Manual — part 540
CYLINDER BLOCK
EM-97
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D
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F
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Refer to piston selection table to replace piston/piston pin assembly. Refer to
NOTE:
●
Piston is available together with piston pin as assembly.
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Piston pin hole (piston pin) grade is provided only for the parts installed at the plant. For service parts,
no grades can be selected. (Only 0 grade is available.)
PISTON RING SIDE CLEARANCE
●
Measure the side clearance of piston ring and piston ring groove
with feeler gauge.
●
If out of the limit, replace piston and/or piston ring assembly.
PISTON RING END GAP
●
Check if the inner diameter of cylinder bore is within specification.
Refer to
EM-100, "PISTON TO CYLINDER BORE CLEAR-
●
Lubricate with new engine oil to piston and piston ring, and then
insert piston ring until middle of cylinder with piston, and mea-
sure piston ring end gap with feeler gauge.
●
If out of the limit, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylinder
and use oversized piston and piston ring.
Standard:
Top ring
0.045 - 0.080 mm (0.0018 - 0.0031 in)
2nd ring
0.030 - 0.070 mm (0.0012 - 0.0028 in)
Oil ring
0.065 - 0.135 mm (0.0026 - 0.0053 in)
Limit:
Top ring
0.11 mm (0.0043 in)
2nd ring
0.10 mm (0.0039 in)
SEM024AA
Standard:
Top ring
0.22 - 0.32 mm (0.0087 - 0.0126 in)
2nd ring
0.22 - 0.32 mm (0.0087 - 0.0126 in)
Oil ring
0.20 - 0.50 mm (0.0079 - 0.0197 in)
Limit:
Top ring
0.56 mm (0.0220 in)
2nd ring
0.56 mm (0.0220 in)
Oil ring
0.86 mm (0.0339 in)
PBIC0118E
EM-98
CYLINDER BLOCK
CONNECTING ROD BEND AND TORSION
●
Check with connecting rod aligner.
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If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BIG END DIAMETER
●
Install connecting rod cap without connecting rod bearing
installed. After tightening the connecting rod nut to the specified
torque. Refer to
dure.
●
Measure the connecting rod big end diameter using an inside
micrometer.
●
If it exceeds the standard, replace connecting rod.
CONNECTING ROD BUSHING OIL CLEARANCE
Inner Diameter of Connecting Rod Bushing
Measure the inner diameter of connecting rod bushing with inside
micrometer.
Bend:
Limit 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
Torsion:
Limit 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
PBIC2077E
Standard
: 55.000 - 55.013 mm (2.1654 - 2.1659 in)
PBIC1641E
Standard
: 22.000 - 22.012 mm (0.8661 - 0.8666 in)
PBIC0120E
CYLINDER BLOCK
EM-99
C
D
E
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EM
Outer Diameter of Piston Pin
Measure the outer diameter of piston pin with micrometer.
Connecting Rod Bushing Oil Clearance
(Connecting rod bushing oil clearance) = (Inner diameter of connecting rod bushing) – (Outer diameter of pis-
ton pin)
●
If the measured value exceeds the standard, replace connecting rod assembly and/or piston/piston pin
assembly.
●
If replacing piston and piston pin assembly, refer to
EM-100, "PISTON TO CYLINDER BORE CLEAR-
●
If replacing connecting rod assembly, refer to
CLEARANCE OF CONNECTING ROD BEARING"
to select
the connecting rod bearing.
Factory installed parts grading:
Service parts apply only to grade “0”.
Unit: mm (in)
CYLINDER BLOCK DISTORTION
●
Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon,
or other contamination.
CAUTION:
Be careful not to allow gasket flakes to enter the engine oil or engine coolant passages.
Standard
: 21.989 - 22.001 mm (0.8657 - 0.8662 in)
PBIC0117E
Standard
: 0.005 - 0.017 mm (0.0002 - 0.0007 in)
PBIC2164E
Grade
0
1
Connecting rod bushing
inner diameter
22.000 - 22.006
(0.8661 - 0.8664)
22.006 - 22.012
(0.8664 - 0.8666)
Piston pin outer diameter
21.989 - 21.995
(0.8657 - 0.8659)
21.995 - 22. 001
(0.8659 - 0.8662)
Piston pin bore diameter
21.993 - 21.999
(0.8659 - 0.8661)
21.999 - 22.005
(0.8661 - 0.8663)
PBIC2372E
EM-100
CYLINDER BLOCK
●
Measure the distortion on the block upper face at some different
points in 6 directions.
●
If out of the limit, replace cylinder block.
INNER DIAMETER OF MAIN BEARING HOUSING
●
Install main bearing caps with main bearings removed, and
tighten the mounting bolts to the specified torque. Refer to
for the tightening procedure.
●
Using a bore gauge, measure the inner diameter of the main
bearing housing.
●
If out of the standard, replace the cylinder block and main bear-
ing caps as an assembly.
NOTE:
These components cannot be replaced as a single unit, because
they were processed together.
PISTON TO CYLINDER BORE CLEARANCE
Inner Diameter of Cylinder Bore
●
Using a bore gauge, measure the cylinder bore diameter for
wear, out-of-round and taper at 6 different points on each cylin-
der. (X and Y directions at A, B and C)
NOTE:
When determining cylinder bore grade, measure cylinder bore at B
position.
●
If the measured value exceeds the limit, or if there are scratches
and/or seizure on the cylinder inner wall, hone or bore the inner wall.
●
Oversize piston is provided. When using oversize piston, hone cylinder so that the clearance between pis-
ton and cylinder satisfies the standard.
Limit
: 0.1 mm (0.004 in)
SEM123C
Standard
: 68.944 - 68.968 mm (2.7143 - 2.7153 in)
PBIC1643E
PBIC0123E
Standard inner diameter:
93.000 - 93.030 mm (3.6614 - 3.6626 in)
Wear limit:
0.20 mm (0.0079 in)
Out-of-round (Difference between X and Y):
0.015 mm (0.0006 in)
Taper limit (Difference between A and C):
0.010 mm (0.0004 in)
Oversize (OS)
: 0.2 mm (0.008 in)
PBIC0124E
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