Infiniti G35 (V35). Manual - part 501

CYLINDER BLOCK

EM-159

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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 measured value exceeds the limit, replace connecting rod assembly and/or piston and piston pin
assembly.

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If replacing piston and piston pin assembly, refer to 

EM-160, "PISTON TO CYLINDER BORE CLEAR-

ANCE"

 .

●

If replacing connecting rod assembly, refer to 

EM-163, "CONNECTING ROD BEARING OIL CLEAR-

ANCE"

  to select connecting rod bearing.

Factory installed parts grading:

●

Service parts apply only to grade “0”.

Unit: mm (in)

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)

               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)

PBIC0809E

EM-160

CYLINDER BLOCK

*: After installing in connecting rod

NOTE:
Figure shows the piston A/T models. The front marks of M/T
models are 2 punched.

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.

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If it exceeds the limit, replace cylinder block.

MAIN BEARING HOUSING INNER DIAMETER

●

Install main bearing caps and main bearing beam without install-
ing main bearings, and tighten main bearing cap bolts to the
specified torque. Refer to 

EM-143, "ASSEMBLY"

  for the tighten-

ing procedure.

●

Measure the inner diameter of main bearing housing with bore
gauge.

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If out of the standard, replace cylinder block and main bearing
caps as assembly.

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

PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Inner Diameter

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Using bore gauge, measure the cylinder bore for wear, out-of-
round and taper at six different points on each cylinder. (“X” and
“Y” directions at “A”, “B” and “C”) (“Y” is in longitudinal direction
of engine)

PBIC0812E

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:

0.2 mm (0.008 in)

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

0.015 mm (0.0006 in)

PBIC0923E

CYLINDER BLOCK

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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
satisfies the standard.

CAUTION:

When using oversize piston, use it for all cylinders with
oversize piston rings.

Piston Skirt Diameter

Measure the outer diameter of piston skirt with 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 it exceeds the limit, replace piston and piston pin assembly. Refer to 

EM-151, "HOW TO SELECT PIS-

TON"

 .

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.

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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 specified piston to cylinder bore clearance.

5.

Measure the finished cylinder bore for out-of-round and taper.

NOTE:
Measurement should be done after cylinder bore cools down.

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

 

0.01 mm (0.0004 in)

Oversize (OS)

: 0.2 mm (0.008 in)

SEM843E

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)

EM-162

CYLINDER BLOCK

CRANKSHAFT MAIN JOURNAL DIAMETER

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Measure the outer diameter of crankshaft main journals with micrometer.

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

EM-

163, "MAIN BEARING OIL CLEARANCE"

 .

CRANKSHAFT PIN JOURNAL DIAMETER

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Measure the outer diameter of crankshaft pin journal with
micrometer.

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If out of the standard, measure the connecting rod bearing oil
clearance. Then use undersize bearing. Refer to 

EM-163,

"CONNECTING ROD BEARING OIL CLEARANCE"

 .

CRANKSHAFT OUT-OF-ROUND AND TAPER

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Measure the dimensions at four different points shown in the fig-
ure on each main journal and pin journal with micrometer. 

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Out-of-round is indicated by the difference in dimensions
between “X” and “Y” at “A” and “B”.

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Taper is indicated by the difference in dimension between “A”
and “B” at “X” and “Y”.

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If the measured value exceeds the limit, correct or replace crankshaft.

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If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then
select the main bearing and/or connecting rod bearing. Refer to 

EM-163, "MAIN BEARING OIL CLEAR-

ANCE"

 and/or 

EM-163, "CONNECTING ROD BEARING OIL CLEARANCE"

 .

CRANKSHAFT RUNOUT

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Place V-block on precise flat table, and support the journals on
the both end of crankshaft.

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Place dial indicator straight up on the No. 3 journal.

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While rotating crankshaft, read the movement of the pointer on
dial indicator. (Total indicator reading)

●

If it exceeds the limit, replace crankshaft.

Standard

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

Standard

: 51.956 - 51.974 mm (2.0455 - 2.0462 in) dia.

PBIC0127E

Limit:

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

: 0.002 mm (0.0001 in)

Taper (Difference between “A” and “B”)

: 0.002 mm (0.0001 in)

SBIA0535E

Standard

: Less than 0.05 mm (0.0020 in)

Limit

: 0.10 mm (0.004 in)

SEM346D