Infiniti FX35 / FX45. Manual - part 656

 

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Infiniti FX35 / FX45. Manual - part 656

 

 

CYLINDER BLOCK

EM-141

< SERVICE INFORMATION >

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• Check with a connecting rod aligner.

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

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-123, "Disassembly and Assembly"

 for the

tightening procedure.

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

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 an inside
micrometer.

Piston Pin Outer Diameter

Bend:

Limit : 0.15 mm (0.006 in) per 100 mm (3.94 in) length

Torsion:

Limit : 0.30 mm (0.012 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

EM-142

< SERVICE INFORMATION >

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CYLINDER BLOCK

Measure the outer diameter of piston pin with a 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-134, "How to Select Piston and Bearing"

.

• 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 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 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)

Limit

: 0.030 mm (0.0012 in)

PBIC0809E

               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 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)

PBIC0812E

CYLINDER BLOCK

EM-143

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

different points in six directions with a straightedge and a feeler
gauge.

• If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

• Install main bearing caps and main bearing beam without installing

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

EM-123, "Disassembly and Assembly"

 for the

tightening procedure.

• Measure the inner diameter of main bearing housing with a 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 

• Using a bore gauge, measure cylinder bore for wear, out-of-round

and taper at six different points on each cylinder. (“X” and “Y” direc-
tions at “A”, “B” and “C”) (“Y” is in longitudinal direction of engine)

• If the measured value exceeds the limit, or if there are scratches

and/or seizure on the cylinder inner wall, hone or re-bore the inner
wall. 

• Oversize piston is provided. When using oversize piston, re-bore

cylinder so that the clearance of the piston-to-cylinder bore satis-
fies the standard.

CAUTION:

When using oversize piston, use oversize pistons for all cylin-
ders with oversize piston rings.

Piston Skirt Diameter

Limit

: 0.1 mm (0.004 in)

SEM123C

Standard

: 63.993 - 64.017 mm (2.5194 - 2.5203 in)

PBIC1643E

Standard inner diameter:

95.500 - 95.530 mm (3.7598 - 3.7610 in)

Wear limit:

0.20 mm (0.0079 in)

Out-of-round (Difference between “X” and “Y”):

Limit: 0.015 mm (0.0006 in)

Taper (Difference between “A” and “C”):

 

Limit: 0.010 mm (0.0004 in)

Oversize (OS)

: 0.2 mm (0.008 in)

PBIC0923E

SEM843E

EM-144

< SERVICE INFORMATION >

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CYLINDER BLOCK

Measure the outer diameter of piston skirt with a micrometer.

Piston-to-Cylinder Bore Clearance

Calculate by piston skirt diameter and cylinder bore inner diameter (direction “Y”, position “B”).
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter).

• If the calculated value exceeds the limit, replace piston and piston pin assembly. Refer to 

EM-134, "How to

Select Piston and Bearing"

.

Re-boring Cylinder Bore

1.

Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.

2.

Install main bearing caps and main bearing beam, and tighten to the specified torque. Otherwise, cylinder
bores may be distorted in final assembly.

3.

Cut cylinder bores.
NOTE:
• When any cylinder needs boring, all other cylinders must also be bored.
• Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a

time.

4.

Hone cylinders to obtain the specified piston to cylinder bore clearance.

5.

Measure finished cylinder bore for the out-of-round and taper.
NOTE:
Measurement should be done after cylinder bore cools down.

CRANKSHAFT MAIN JOURNAL DIAMETER

• Measure the outer diameter of crankshaft main journals with a micrometer.

• If out of the standard, measure the main bearing oil clearance. Then use undersize bearing. Refer to "MAIN

BEARING OIL CLEARANCE".

CRANKSHAFT PIN JOURNAL DIAMETER

Measure point

: Distance from the top 41.0 mm (1.614 in)

Standard

: 95.480 - 95.510 mm (3.7590 - 3.7602 in)

PBIC0125E

Standard

: 0.010 - 0.030 mm (0.0004 - 0.0012 in)

Limit

: 0.08 mm (0.0031 in)

Re-bored size calculation: D = A + B – C

where,

D: Bored diameter

A: Piston skirt diameter as measured

B: Piston to cylinder bore clearance (standard value)

C: Honing allowance 0.02 mm (0.0008 in)

Standard

: 59.951 - 59.975 mm (2.3603 - 2.3612 in) dia.

 

 

 

 

 

 

 

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