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Infiniti FX35 / FX45. Manual - part 685

CYLINDER BLOCK

EM-257

< SERVICE INFORMATION >

[VK45DE]

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 crankshaft
also.

PISTON TO PISTON PIN OIL CLEARANCE

Piston Pin Hole Diameter

Measure the inner diameter of piston pin hole with inside microme-
ter.

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with micrometer.

Piston to Piston Pin Oil Clearance

(Piston to piston pin oil clearance) = (Piston pin hole diameter) – (Piston pin outer diameter)

• If the calculated value is out of the standard, replace piston and piston pin assembly.
• When replacing piston and piston pin assembly, refer to

EM-250, "How to Select Piston and Bearing"

NOTE:
• Piston is available together with piston pin as assembly.
• Piston pin (piston pin hole) grade is provided only for the parts installed at the plant. For service parts, no

piston pin grades can be selected. (Only “0” grade is available.)

PISTON RING SIDE CLEARANCE

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)

EM-258

< SERVICE INFORMATION >

[VK45DE]

CYLINDER BLOCK

• Measure the side clearance of piston ring and piston ring groove

with feeler gauge.

• If the measured value exceeds the limit, replace piston ring, and measure again. If it still exceeds the limit,

replace piston also.

PISTON RING END GAP

• Make sure that the cylinder bore inner diameter is within the speci-

fication. Refer to "Cylinder Bore Inner Diameter".

• Lubricate with new engine oil to piston and piston ring, and then

insert piston ring until middle of cylinder with piston, and measure
the piston ring end gap with feeler gauge.

• If the measured value exceeds the limit, replace piston ring, and measure again. If it still exceeds the limit,

re-bore cylinder and use oversize piston and piston rings.

CONNECTING ROD BEND AND TORSION

• Check with connecting rod aligner.

• If it exceeds the limit, replace connecting rod assembly.

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

: 0.1 mm (0.004 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

: 0.96 mm (0.0378 in)

PBIC0118E

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

CYLINDER BLOCK

EM-259

< SERVICE INFORMATION >

[VK45DE]

CONNECTING ROD BIG END DIAMETER

• Install connecting rod bearing cap without installing connecting rod

bearing, and tightening connecting rod bolts to the specified
torque. Refer to

EM-242, "Disassembly and Assembly"

for the

tightening procedure.

• Measure the inner diameter of connecting rod big end with inside

micrometer.

• If out of the standard, replace connecting rod assembly.

CONNECTING ROD BUSHING OIL CLEARANCE

Connecting Rod Bushing Inner Diameter

Measure the inner diameter of connecting rod bushing with inside
micrometer.

Piston Pin Outer Diameter

Measure the outer diameter of piston pin with micrometer.

Connecting Rod Bushing Oil Clearance

(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)

• If the calculated value exceeds the limit, replace connecting rod assembly and/or piston and piston pin

assembly.

• If replacing piston and piston pin assembly, refer to

EM-250, "How to Select Piston and Bearing"

Standard

: 55.000 - 55.013 mm (2.1654 - 2.1659 in)

PBIC1641E

Standard

: 22.000 - 22.012 mm (0.8661 - 0.8666 in)

PBIC0120E

Standard

: 21.989 - 22.001 mm (0.8657 - 0.8662 in)

PBIC0117E

Standard

: 0.005 - 0.017 mm (0.0002 - 0.0007 in)

Limit

: 0.030 mm (0.0012 in)

EM-260

< SERVICE INFORMATION >

[VK45DE]

CYLINDER BLOCK

• If replacing connecting rod assembly, refer to "CONNECTING

ROD BEARING OIL CLEARANCE" to select the connecting rod
bearing.

Factory installed parts grading:

• Service parts apply only to grade “0”.

Unit: mm (in)

*: After installing in connecting rod

CYLINDER BLOCK DISTORTION

• Using 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 engine oil or engine coolant passages.

• Measure the distortion on the cylinder block upper face at some

different points in six directions with straightedge and feeler gauge.

• If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

• Install main bearing caps and main bearing without installing main

bearings, and tighten main bearing cap bolts to the specified
torque. Refer to

EM-242, "Disassembly and Assembly"

for the

tightening procedure.

• Measure the inner diameter of main bearing housing with bore

gauge.

• If out of the standard, replace cylinder block and main bearing

caps as assembly.
NOTE:
Cylinder block cannot be replaced as a single part, because it is
machined together with main bearing caps.

PISTON TO CYLINDER BORE CLEARANCE

Cylinder Bore Inner Diameter

PBIC2164E

Grade

Connecting rod bushing
inner diameter *

22.000 - 22.006
(0.8661 - 0.8664)

22.006 - 22.012
(0.8664 - 0.8666)

Piston pin hole diameter

21.993 - 21.999
(0.8659 - 0.8661)

21.999 - 22.005
(0.8661 - 0.8663)

Piston pin outer diameter

21.989 - 21.995
(0.8657 - 0.8659)

21.995 - 22. 001
(0.8659 - 0.8662)

PBIC2372E

Limit

: 0.1 mm (0.004 in)

SEM123C

Standard

: 68.944 - 68.968 mm (2.7143 - 2.7153 in)

PBIC1643E

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