Nissan Pathfinder (2010 year). Instruction — part 373
EM-112
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ENGINE UNIT
21. Assembly is in the reverse order of disassembly after this step.
Inspection After Disassembly
INFOID:0000000005260477
CRANKSHAFT END PLAY
• Measure the clearance between thrust bearings and crankshaft
arm when crankshaft is moved fully forward or backward with dial
indicator.
• If the measured value exceeds the limit, replace thrust bearings,
and measure again. If it still exceeds the limit, replace crankshaft
also.
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 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)
Standard
: 0.10 - 0.25 mm (0.0039 - 0.0098 in)
Limit
: 0.30 mm (0.0118 in)
PBIC2953E
Standard
: 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit
: 0.40 mm (0.0157 in)
PBIC2954E
Standard
: 21.993 - 22.005 mm (0.8659 - 0.8663 in)
PBIC0116E
Standard
: 21.989 - 22.001 mm (0.8657 - 0.8662 in)
PBIC0117E
2010 Pathfinder
ENGINE UNIT
EM-113
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• 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-123, "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
• Measure 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.
PISTON RING END GAP
• Make sure that the cylinder bore inner diameter is within the speci-
fication. Follow the "Cylinder Bore Inner Diameter" procedure.
• 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.
CONNECTING ROD BEND AND TORSION
Standard
: 0.002 - 0.006 mm (0.0001 - 0.0002 in)
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
: 0.10 mm (0.0039 in)
SEM024AA
Standard:
Top ring
: 0.23 - 0.33 mm (0.0091 - 0.0130 in)
2nd ring
: 0.33 - 0.48 mm (0.0130 - 0.0189 in)
Oil ring
: 0.20 - 0.50 mm (0.0079 - 0.0197 in)
Limit:
Top ring
: 0.56 mm (0.0220 in)
2nd ring
: 0.68 mm (0.0268 in)
Oil ring
: 0.85 mm (0.0335 in)
PBIC0118E
2010 Pathfinder
EM-114
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ENGINE UNIT
• Check with connecting rod aligner.
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD DIAMETER (BIG END)
• Install connecting rod bearing cap without installing connecting rod
bearing, and tightening connecting rod bolts to the specified
torque. Refer to
EM-102, "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 (SMALL END)
Connecting Rod Bushing Inside Diameter (Small End)
Measure inside diameter of connecting rod bushing using suitable
tool.
Piston Pin Diameter
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
Standard
: 57.000 - 57.013 mm (2.2441 - 2.2446 in)
PBIC1641E
Standard
: 22.000 - 22.012 mm (0.8661 - 0.8666 in)
PBIC0120E
2010 Pathfinder
ENGINE UNIT
EM-115
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Measure diameter of piston pin using suitable tool.
Connecting Rod Bushing Oil Clearance (Small End)
(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-123, "How to Select Piston and Bearing"
.
• If replacing connecting rod assembly, follow the "CONNECTING
ROD BEARING OIL CLEARANCE" procedure to select the con-
necting rod bearing.
Factory installed parts grading:
• Only grade “0”.
Unit: mm (in)
*: After installing in connecting rod
CYLINDER BLOCK DISTORTION
• Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.
CAUTION:
Do not allow any debris 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)
PBIC2950E
2010 Pathfinder
EM-116
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ENGINE UNIT
• 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 lower cylinder block without installing main bearings, and
tighten lower cylinder block bolts to the specified torque. Refer to
EM-102, "Disassembly and Assembly"
for the tightening proce-
dure.
• Measure the inner diameter of main bearing housing with bore
gauge.
• If out of the standard, replace cylinder block and lower cylinder
block as assembly.
NOTE:
Cylinder block cannot be replaced as a single part, because it is
machined together with lower cylinder block.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Inner Diameter
• Using 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”) (“X” 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.
Piston Skirt Diameter
Limit : 0.1 mm (0.004 in)
SEM123C
Standard
: 74.993 - 75.017 mm (2.9525 - 2.9534 in)
PBIC2012E
Standard inner diameter:
95.500 - 95.530 mm (3.7598 - 3.7610 in)
Out-of-round (Difference between “X” and “Y”):
0.015 mm (0.0006 in)
Taper limit (Difference between “A” and “C”):
0.01 mm (0.0004 in)
PBIC2955E
SEM843E
2010 Pathfinder
ENGINE UNIT
EM-117
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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 “X”, 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
.
Re-boring Cylinder Bore
1. Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.
2. Install lower cylinder block, 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 the finished cylinder bore for 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 micrometer.
• If out of the standard, measure the main bearing oil clearance. Then use undersize bearing.
CRANKSHAFT PIN JOURNAL DIAMETER
Measure point
: Distance from the top 43.03 mm (1.6941 in)
Standard
: 95.480 - 95.510 mm (3.7590 - 3.7602 in)
PBIC2956E
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
: 69.951 - 69.975 mm (2.7540 - 2.7549 in) dia.
2010 Pathfinder
EM-118
< DISASSEMBLY AND ASSEMBLY >
[VQ40DE]
ENGINE UNIT
• Measure the outer diameter of crankshaft pin journal with
micrometer.
• If out of the standard, measure the connecting rod bearing oil
clearance. Then use undersize bearing.
OUT-OF-ROUND AND TAPER OF CRANKSHAFT
• Measure the dimensions at four different points as shown on each
main journal and pin journal with micrometer.
• Out-of-round is indicated by the 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 limit, 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.
CRANKSHAFT RUNOUT
• Place V-block on precise flat table, and support the journals on the
both end of crankshaft.
• Place dial indicator straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on 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 cap, and
tighten connecting rod bolts to the specified torque. Refer to
102, "Disassembly and Assembly"
for the tightening procedure.
• Measure the inner diameter of connecting rod bearing with inside
micrometer.
(Bearing oil clearance) = (Connecting rod bearing inner diameter) –
(Crankshaft pin journal diameter)
• 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-123, "How to Select Piston and Bearing"
Standard
: 53.956 - 53.974 mm (2.1242 - 2.1250 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 (0.002 in)
Limit
: 0.10 mm (0.0039 in)
SEM346D
Standard
: 0.034 - 0.059 mm (0.0013 - 0.0023 in) (actu-
al clearance)
Limit
: 0.070 mm (0.0028 in)
PBIC1642E
2010 Pathfinder
ENGINE UNIT
EM-119
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Method of Using Plastigage
• Remove oil and dust on crankshaft pin journal and the surfaces of each bearing completely.
• Cut 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 cap, and tighten connecting rod bolts to the specified
EM-102, "Disassembly and Assembly"
for the tightening procedure.
CAUTION:
Do not rotate crankshaft.
• Remove connecting rod bearing cap and bearing, and using scale
on 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 lower cylinder block,
and tighten lower cylinder block bolts to the specified torque. Refer
to
EM-102, "Disassembly and Assembly"
for the tightening proce-
dure.
• Measure the inner diameter of main bearing with bore gauge.
(Bearing 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 specified bearing oil clearance. Refer to
.
Method of Using Plastigage
• Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
• Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil
holes.
• Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the
specified torque. Refer to
EM-102, "Disassembly and Assembly"
for the tightening procedure.
CAUTION:
Do not rotate crankshaft.
• Remove lower cylinder block and bearings, and using scale on
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”.
CRUSH HEIGHT OF MAIN BEARING
PBIC1149E
Standard
: 0.035 - 0.045 mm (0.0014 - 0.0018 in)
(actual clearance)
Limit
: 0.065 mm (0.0026 in)
PBIC2204E
PBIC1149E
2010 Pathfinder
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