2008 INFINITI FX35 Service Manual

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Page 2625 of 3924

INFINITI FX35 2008 Service Manual
CYLINDER BLOCKEM-141
< SERVICE INFORMATION > [VQ35DE]
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Check with a connecting rod aligner.
If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD

Page 2626 of 3924

INFINITI FX35 2008 Service Manual
EM-142
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
Measure the outer diameter of piston pin with a micrometer.
Connecting Rod Bushing Oil Clearance
(Connecting rod bushing oil clearance) = (Connec

Page 2627 of 3924

INFINITI FX35 2008 Service Manual
CYLINDER BLOCKEM-143
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Measure the distortion on the cylinder block upper face at some
different points in six directi ons with a stra

CYLINDER BLOCKEM-143
< SERVICE INFORMATION > [VQ35DE]
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Measure the distortion on the cylinder block upper face at some
different points in six directi ons 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
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2628 of 3924

INFINITI FX35 2008 Service Manual
EM-144
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
Measure the outer diameter of
piston skirt with a micrometer.
Piston-to-Cylinder Bore Clearance
Calculate by piston skirt diameter and cylinder

EM-144
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
Measure the outer diameter of
piston skirt with a micrometer.
Piston-to-Cylinder Bore Clearance
Calculate by piston skirt diameter and cylinder bor e 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 cranks haft main journals with a micrometer.
If out of the standard, measure t he 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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Page 2629 of 3924

INFINITI FX35 2008 Service Manual
CYLINDER BLOCKEM-145
< SERVICE INFORMATION > [VQ35DE]
C
D
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F
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M A
EM
NP
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Measure the outer diameter of crankshaft pin journal with a
micrometer.
If out of the standard, measure the c

CYLINDER BLOCKEM-145
< SERVICE INFORMATION > [VQ35DE]
C
D
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F
G H
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M A
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Measure the outer diameter of crankshaft pin journal with a
micrometer.
If out of the standard, measure the connecting rod bearing oil clearance. Then use undersize bearing. Refer to "CONNECTING
ROD BEARING OIL CLEARANCE".
CRANKSHAFT OUT-OF-ROUND AND TAPER
Measure the dimensions at four different points as shown in thefigure on each main journal and pin journal with a micrometer.
Out-of-round is indicated by t he difference in the dimensions
between “X” and “Y” at “A” and “B”.
Taper is indicated by the difference in the dimensions between “A” and “B” at “X” and “Y”.
If the measured value exceeds the li mit, correct or replace crankshaft.
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 "MAIN BEARING OIL CLEARANCE" and/or
"CONNECTING ROD BEARING OIL CLEARANCE".
CRANKSHAFT RUNOUT
Place V-block on precise flat table, and support the journals on the both end of crankshaft.
Place a dial indicator straight up on the No. 3 journal.
While rotating crankshaft, read the movement of the pointer on a dial indicator. (Total indicator reading)
If it exceeds the limit, replace crankshaft.
CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation
Install connecting rod bearings to connecting rod and connecting rod cap, and tighten 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 bearing with an
inside micrometer.
(Oil clearance) = (Connecting rod bearing inner diameter) – (Crank-
shaft pin journal diameter) Standard : 51.956 - 51.974 mm (2.0455 - 2.0462 in) dia.
PBIC0127E
Limit:
Out-of-round (Differen ce 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 (0.0039 in)
SEM346D
Standard : 0.034 - 0.059 mm (0.0013 - 0.0023 in) (actual clearance)
Limit : 0.070 mm (0.0028 in)
PBIC1642E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2630 of 3924

INFINITI FX35 2008 Service Manual
EM-146
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
If the calculated value exceeds the limit, select
proper connecting rod bearing according to connecting rod
big end diameter and crankshaft pi

EM-146
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
If the calculated value exceeds the limit, select
proper connecting rod bearing according to connecting rod
big end diameter and crankshaft pin journal diameter to obtain the specified bearing oil clearance. Refer to
EM-134, "
How to Select Piston and Bearing".
Method of Using Plastigage
Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely.
Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil
holes.
Install connecting rod bearings to connecting rod and connecting rod bearing cap, and tighten connecting rod bolts to the specified torque. Refer to EM-123, "
Disassembly and Assembly" for the tightening proce-
dure.
CAUTION:
Do not rotate crankshaft.
Remove connecting rod bearing cap and bearings, and using the scale on the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the limit is
same as that described in the “Method by Calculation”.
MAIN BEARING OIL CLEARANCE
Method by Calculation
Install main bearings to cylinder block and main bearing caps, and
tighten main bearing cap bolts with main bearing beam to the
specified torque. Refer to EM-123, "
Disassembly and Assembly"
for the tightening procedure.
Measure the inner diameter of main bearing with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) – (Crankshaft main
journal diameter)
If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diame-
ter and crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to EM-134,
"How to Select Piston and Bearing".
Method of Using Plastigage
Remove engine oil and dust on crankshaft journal and the surfaces of each bearing completely.
Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil
holes.
Install main bearing to cylinder block and main bearing cap, and tighten main bearing bolts with main bear-
ing beam to the specified torque. Refer to EM-123, "
Disassembly and Assembly" for the tightening proce-
dure.
CAUTION:
Never rotate crankshaft.
PBIC1149E
Standard : 0.035 - 0.045 mm (0.0014 - 0.0018 in)
(actual clearance)
Limit : 0.065 mm (0.0026 in)
PBIC1644E
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2631 of 3924

INFINITI FX35 2008 Service Manual
CYLINDER BLOCKEM-147
< SERVICE INFORMATION > [VQ35DE]
C
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Remove main bearing caps and bearings, and using the scale on
the plastigage bag, measure the plastigage width.

Page 2632 of 3924

INFINITI FX35 2008 Service Manual
EM-148
< SERVICE INFORMATION >[VQ35DE]
CYLINDER BLOCK
Measure the outer diameter “d”
at position shown in the figure.
If the reduction appears in a position other than “d”, regard it as

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