Nissan Pathfinder. Manual — part 571
CYLINDER BLOCK
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• Insert piston ring until it is in the middle of the cylinder bore and
measure the end gap.
• If out of specification, replace piston ring.
CONNECTING ROD BEND AND TORSION
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BEARING HOUSING DIAMETER (BIG END)
• Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod nut to the specified
torque, measure the connecting rod bearing housing big end inner
diameter using an inside micrometer.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Inner Diameter of Connecting Rod (Small End)
Standard
Top ring
: 0.23 - 0.28 mm (0.0091 - 0.0110 in)
2nd ring
: 0.33 - 0.43 mm (0.0130 - 0.0169 in)
Oil ring
: 0.20 - 0.45 mm (0.0079 - 0.0177 in)
Limit:
Top ring
: 0.50 mm (0.0197 in)
2nd ring
: 0.62 mm (0.0244 in)
Oil ring
: 0.80 mm (0.0315 in)
SEM599A
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
SEM038F
SEM003F
Standard
: 55.000 - 55.013 mm (2.1654 - 2.1659 in)
PBIC0119E
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CYLINDER BLOCK
• Measure inner diameter of piston pin bushing.
Outer Diameter of Piston Pin
• Measure outer diameter of piston pin.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inner diameter of con-
necting rod small end) – (Outer diameter of piston pin)
• If the measured value exceeds the standard, replace the connect-
ing rod assembly and/or piston and piston pin assembly.
• If replacing the piston and piston pin assembly, use the Table for
Selective Fitting for Piston to select the piston corresponding to the
applicable bore grade of the cylinder block to be used. Follow the
"PISTON-TO-CYLINDER BORE CLEARANCE" procedure.
Factory installed parts grading:
Service parts apply only to grade 0.
Unit: mm (in)
Standard
Grade No. 0
: 22.000 - 22.006 mm (0.8661 - 0.8664 in)
Grade No. 1
: 22.006 - 22.012 mm (0.8664 - 0.8666 in)
PBIC0120E
Standard
Grade No. 0
: 21.989 - 21.995 mm (0.8657 - 0.8659 in)
Grade No. 1
: 21.995 - 22.001 mm (0.8659 -0.8662 in)
PBIC0117E
Standard
: 0.005 - 0.017 mm (0.0002 - 0.0007 in)
Limit
: 0.030 mm (0.0012 in)
SEM457G
: Engine front
(A)
: Piston grade No.
(B)
: Piston front mark
(C)
: Oil hole
(D)
: Connecting rod front mark
(E)
: Cylinder No.
(F)
: Pin grade No.
(G)
: Crown I.D. code
AWBIA1399ZZ
Grade
0
1
Connecting rod small end inner diameter
22.000 - 22.006
(0.8661 - 0.8664)
22.006 - 22.012
(0.8664 - 0.8666)
CYLINDER BLOCK
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CYLINDER BLOCK DISTORTION
• Using a scraper, remove any old gasket material on the cylinder
block surface and remove any engine oil, scale, carbon, or other
contamination.
CAUTION:
Be careful not to allow gasket flakes to enter the engine oil or
engine coolant passages.
• Measure the distortion on the block upper face at different points in
six directions.
• If out of specification, resurface the cylinder block. The allowable
amount of resurfacing is dependent on the amount of any cylinder
head resurfacing. The resurfacing limit is [amount of cylinder head resurfacing] + [amount of cylinder head
resurfacing] = 0.2 mm (0.008 in).
INNER DIAMETER OF MAIN BEARING HOUSING
• Install the main bearing caps with the main bearings removed, and tighten the bolts to the specified torque.
• Using suitable tool, measure the inner diameter of the main bear-
ing housing (A).
• If out of the standard, replace the cylinder block and main bearing
caps as an assembly.
NOTE:
These components cannot be replaced as a single unit, because
they were processed together.
PISTON-TO-CYLINDER BORE CLEARANCE
1. Using suitable tool, measure cylinder bore for wear, out-of-round and taper at (A), (B) and (C). The X axis
is in the longitudinal direction of the engine.
Cylinder bore inner diameter
Piston pin outer diameter
21.989 - 21.995
(0.8657 - 0.8659)
21.995 - 22. 001
(0.8659 - 0.8662)
Piston pin hole diameter
21.993 - 21.999
(0.8659 - 0.8661)
21.999 - 22.005
(0.8661 - 0.8663)
Distortion limit
: 0.10 mm (0.0039 in)
Cylinder block height : 214.95 - 215.05 mm
(8.4626 - 8.4665 in)
SEM123C
Standard
: 63.993 - 64.017 mm (2.5194 - 2.5203 in)
SEM845E
Grade No.
Standard inner diameter
Wear limit
No. 1
95.500 - 95.510 mm (3.7598 - 3.7602 in)
0.20 mm (0.0079 in)
No. 2
95.510 - 95.520 mm (3.7602 - 3.7606 in)
No. 3
95.520 - 95.530 mm (3.7606 - 3.7610 in)
SEM843E
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CYLINDER BLOCK
If it exceeds the limit, rebore all cylinders. Replace cylinder block
if necessary.
2. Check for scratches and seizure. If seizure is found, hone it.
• If both cylinder block and piston are replaced with new
ones, select piston of the same grade number punched on
cylinder block rear position. These numbers are punched
in either Arabic or Roman numerals.
3. Measure piston skirt diameter, using suitable tool.
4. Check that piston-to-bore clearance is within specification.
• The piston-to-bore clearance is measured at the (B) level in
the cylinder as shown.
5. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter.
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)
JPBIA2238GB
SEM756G
Piston diameter (A)
: Refer to
.
Measuring point (a)
(Distance from the top)
: 38.0 mm (1.496 in)
SEM258C
Piston-to-bore
clearance at (B)
: 0.010 - 0.030 mm (0.0004 - 0.0012 in)
JPBIA2238GB
Rebored size calculation : D = A + B
− C
where,
(D)
: Bored diameter
(A)
: Piston diameter as measured
(B)
: Piston-to-bore clearance
(C)
: Honing allowance 0.02 mm (0.0008 in)
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