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Main Bearing Selection Table (No.2 and 4 journals)
Main Bearing Grade Table (All Journals)
Unit: mm (in)
KBIA0150E
Grade number ThicknessIdentification color
(UPR / LWR)Remarks
0 1.973 - 1.976 (0.0777 - 0.0778) Black
Grade and color are the same
for upper and lower bearings. 1 1.976 - 1.979 (0.0778 - 0.0779) Brown
2 1.979 - 1.982 (0.0779- 0.0780) Green
3 1.982 - 1.985 (0.0780 - 0.0781) Yellow
4 1.985 - 1.988 (0.0781 - 0.0783) Blue
5 1.988 - 1.991 (0.0783 - 0.0784) Pink
6 1.991 - 1.994 (0.0784 - 0.0785) Purple
7 1.994 - 1.997 (0.0785 - 0.0786) White
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Use Undersize Bearing Usage Guide
lUse undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
lWhen using undersize (US) b NISSAN X-TRAIL 2003 Electronic Repair Manual EM-80
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Use Undersize Bearing Usage Guide
lUse undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
lWhen using undersize (US) b](/manual-img/5/57402/w960_57402-2049.png)
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Use Undersize Bearing Usage Guide
lUse undersize (US) bearing when oil clearance with standard size main bearing is not within specification.
lWhen using undersize (US) bearing, measure the bearing inner diameter with bearing installed, and grind
journal until oil clearance falls within specification.
Bearing undersize table
Unit: mm (in)
CAUTION:
Keep fillet R when grinding crankshaft journal in order to use
undersize bearing (All journals).
Inspection After DisassemblyEBS009RA
CRANKSHAFT SIDE CLEARANCE
lUsing a dial gauge, measure the clearance between the thrust
bearings and the crankshaft arm when the crankshaft is moved
fully forward or backward.
lIf the measured value exceeds the limit, replace the thrust bear-
ings, and measure again. If it still exceeds the limit, replace the
crankshaft also.
01UPR 1.973 - 1.976 (0.0777 - 0.0778)
Black / Brown
Grade and color are different
for upper and lower bearings. LWR 1.976 - 1.979 (0.0778 - 0.0779)
12UPR 1.976 - 1.979 (0.0778 - 0.0779)
Brown / Green
LWR 1.979 - 1.982 (0.0779 - 0.0780)
23UPR 1.979 - 1.982 (0.0779- 0.0780)
Green / Yellow
LWR 1.982 - 1.985 (0.0780 - 0.0781)
34UPR 1.982 - 1.985 (0.0780 - 0.0781)
Ye l l o w / B l u e
LWR 1.985 - 1.988 (0.0781 - 0.0783)
45UPR 1.985 - 1.988 (0.0781 - 0.0783)
Blue / Pink
LWR 1.988 - 1.991 (0.0783 - 0.0784)
56UPR 1.988 - 1.991 (0.0783 - 0.0784)
Pink / Purple
LWR 1.991 - 1.994 (0.0784 - 0.0785)
67UPR 1.991 - 1.994 (0.0784 - 0.0785)
Purple / White
LWR 1.994 - 1.997 (0.0785 - 0.0786) Grade number ThicknessIdentification color
(UPR / LWR)Remarks
Size Thickness
US 0.25 (0.0098) 2.106 - 2.114 (0.0829 - 0.0832)
KBIA0148E
Standard : 0.10 - 0.26 mm (0.0039 - 0.0102 in)
Limit : 0.30 mm (0.0118 in)
PBIC0268E
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CONNECTING ROD SIDE CLEARANCE
lMeasure side clearance between connecting rod and crankshaft
arm with feeler gauge.
lIf the measured value exceed NISSAN X-TRAIL 2003 Electronic Repair Manual CYLINDER BLOCK
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CONNECTING ROD SIDE CLEARANCE
lMeasure side clearance between connecting rod and crankshaft
arm with feeler gauge.
lIf the measured value exceed](/manual-img/5/57402/w960_57402-2050.png)
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CONNECTING ROD SIDE CLEARANCE
lMeasure side clearance between connecting rod and crankshaft
arm with feeler gauge.
lIf the measured value exceeds the limit, replace the connecting
rod bearings, and measure again. If it still exceeds the limit,
replace the crankshaft also.
PISTON AND PISTON PIN CLEARANCE
Inner Diameter of Piston Pin
lMeasure the inner diameter of piston pin bore with an inside
micrometer.
OuterDiameterofPistonPin
lMeasure outer diameter of piston pin with a micrometer.
Piston and Piston Pin Clearance
(Piston pin clearance) = (Piston pin bore diameter) – (Outer diameter
of piston pin)
lIf clearance exceeds specification, replace either or both of pis-
ton/piston pin assembly and connecting rod assembly with refer-
ence to specification of each parts.
lRefer to piston selection table to replace piston/piston pin
assembly. Refer toEM-74, "
HOW TO SELECT PISTON".
lRefer to connecting rod bearing selection table to replace con-
necting rod. Refer toEM-74, "
HOW TO SELECT CONNCTING
ROD BEARING". Standard : 0.20 - 0.35 mm (0.0079 - 0.0138 in)
Limit : 0.50 mm (0.0197 in)
KBIA0071E
Standard : 19.993 - 20.005 mm (0.7871 - 0.7876 in)
PBIC0116E
Standard : 19.989 - 20.001 mm (0.7870 - 0.7874 in)
PBIC0117E
Standard : 0.002 - 0.006 mm (0.0001 - 0.0002 in)
KBIA0259E
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NOTE:
lThe connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant.
For service parts, no grades can NISSAN X-TRAIL 2003 Electronic Repair Manual EM-82
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NOTE:
lThe connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant.
For service parts, no grades can](/manual-img/5/57402/w960_57402-2051.png)
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NOTE:
lThe connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant.
For service parts, no grades can be selected. (Only 0 grade is
available.)
lRefer toEM-83, "CONNECTING ROD BUSHING OIL CLEAR-
ANCE (SMALL END)"for the values for each grade at the plant.
lRegarding marks on piston head, Refer toEM-74, "HOW TO
SELECT PISTON".
PISTON RING SIDE CLEARANCE
lMeasure side clearance of piston ring and piston ring groove
with feeler gauge.
lIf out of specification, replace piston and/or piston ring assembly.
PISTON RING END GAP
lCheck if inner diameter of cylinder bore is within specification.
Refer toEM-85, "
PISTON TO CYLINDER BORE CLEARANCE"
.
lInsert piston ring until middle of cylinder with piston, and mea-
sure gap.
lIf out of specification, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylin-
der and use oversized piston and piston ring.
CONNECTING ROD BEND AND TORSION
lCheck with connecting rod aligner.
KBIA0067E
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 0.21 - 0.31 mm (0.0083 - 0.0122 in)
2nd ring 0.32 - 0.47 mm (0.0126 - 0.0185 in)
Oil ring 0.20 - 0.60 mm (0.0079 - 0.0236 in)
Limit:
Topring 0.54mm(0.0213in)
2nd ring 0.67 mm (0.0264 in)
Oilring 0.95mm(0.0374in)
SEM822B
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lIf it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BEARING (BIG END)
lInstall the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod big end inner diameter
usinganinsidemicrometer.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Inner Diameter of Connecting Rod (Small End)
lMeasure inner diameter of bushing.Bend:
Limit 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
Tor s i on :
Limit 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
SEM003F
SEM038F
Standard : 48.000 - 48.013 mm (1.8898 - 1.8903 in)
PBIC0119E
Standard : 20.000 - 20.012 mm (0.7874 - 0.7879 in)
PBIC0120E
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Outer Diameter of Piston Pin
lMeasure outer diameter of piston pin.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inner dia NISSAN X-TRAIL 2003 Electronic Repair Manual EM-84
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Outer Diameter of Piston Pin
lMeasure outer diameter of piston pin.
Connecting Rod Bushing Oil Clearance (Small End)
(Connecting rod small end oil clearance) = (Inner dia](/manual-img/5/57402/w960_57402-2053.png)
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Outer Diameter of Piston Pin
lMeasure 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)
lIf the measured value exceeds the standard, replace the con-
necting rod assembly and/or piston and piston pin assembly.
lIf replacing the piston and piston pin assembly, refer to the “Pis-
ton Selection Table” to select the piston corresponding to the
applicable bore grade of the cylinder block to be used. Refer to
EM-74, "
HOW TO SELECT PISTON".
Factory installed parts grading:
lService parts apply only to grade 0.
Unit: mm (in)
CYLINDER BLOCK DISTORTION
lUsing a scraper, remove gasket on the cylinder block surface,
and also remove oil, scale, carbon, or other contamination.
CAUTION:
Be careful not to allow gasket flakes to enter the oil or cool-
ant passages.
lMeasure the distortion on the block upper face at some different
points in 6 directions.
lIf out of the distortion limit, replace the cylinder block.Standard : 19.989 - 20.001 mm (0.7870 - 0.7874 in)
PBIC0117E
Standard : 0.005 - 0.017 mm (0.0002 - 0.0007 in)
KBIA0067E
Grade 0 1
Connecting rod small end
inner diameter20.000 - 20.006
(0.7874 - 0.7876)20.006 - 20.012
(0.7876 - 0.7879)
Piston pin outer diameter19.989 - 19.995
(0.7870 - 0.7872)19.995 - 20. 001
(0.7872 - 0.7874)
Piston pin bore diameter19.993 - 19.999
(0.7871- 0.7874)19.999 - 20.005
(0.7874 - 0.7876)
KBIA0259E
Limit : 0.1 mm (0.004 in)
PBIC0121E
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INNER DIAMETER OF MAIN BEARING HOUSING
lInstall the main bearing caps with the main bearings removed,
and tighten the mounting bolts to the spec NISSAN X-TRAIL 2003 Electronic Repair Manual CYLINDER BLOCK
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INNER DIAMETER OF MAIN BEARING HOUSING
lInstall the main bearing caps with the main bearings removed,
and tighten the mounting bolts to the spec](/manual-img/5/57402/w960_57402-2054.png)
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INNER DIAMETER OF MAIN BEARING HOUSING
lInstall the main bearing caps with the main bearings removed,
and tighten the mounting bolts to the specified torque.
lUsing a bore gauge, measure the inner diameter of the main
bearing housing.
lIf out of the standard, replace the cylinder block and lower cylin-
der block assembly.
NOTE:
These components cannot be replaced as a single unit because
they were processed together.
PISTON TO CYLINDER BORE CLEARANCE
Inner Diameter of Cylinder Bore
lUsing a bore gauge, measure cylinder bore for wear, out-of-
round and taper at 6 different points on each cylinder. (X and Y
directions at A, B and C)(Y is in longitudinal direction of engine)
NOTE:
When determining cylinder bore grade, measure cylinder bore at B
position.
lIf the measured value exceeds the limit, or if there are scratches and/or seizure on the cylinder inner wall,
hone or rebore the inner wall.
lAn oversize piston is provided. When using an oversize piston, rebore the cylinder so that the clearance
of the piston cylinder satisfies the standard.
OuterDiameterofPiston
lMeasure piston skirt diameter.Standard : 58.944 - 58.967 mm (2.3206 - 2.3215 in)
PBIC0269E
KBIA0151E
Standard inner diameter:
89.000 - 89.030 mm (3.5039 - 3.5051 in)
Wear limit:
0.2 mm (0.008 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)
Over size (OS) : 0.2 mm (0.008 in)
Standard : 88.980 - 89.010 mm (3.5031 - 3.5043 in)
PBIC0125E
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lMeasure point (Distance from the top): 42 mm (1.65 in)
Piston to Cylinder Bore Clearance
lCalculate by outer diameter of piston skirt and inner diameter of cylinder (dir NISSAN X-TRAIL 2003 Electronic Repair Manual EM-86
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lMeasure point (Distance from the top): 42 mm (1.65 in)
Piston to Cylinder Bore Clearance
lCalculate by outer diameter of piston skirt and inner diameter of cylinder (dir](/manual-img/5/57402/w960_57402-2055.png)
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lMeasure point (Distance from the top): 42 mm (1.65 in)
Piston to Cylinder Bore Clearance
lCalculate by outer diameter of piston skirt and inner diameter of cylinder (direction X, position B).
(Clearance) = (Inner diameter of cylinder) – (Outer diameter of piston skirt).
lIf it exceeds the limit, replace piston/piston pin assembly.
Reboring Cylinder Bore
1. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter “A”.
2. Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted
in final assembly.
3. Cut cylinder bores.
lWhen any cylinder needs boring, all other cylinders must also be bored.
lDo 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-bore clearance.
5. Measure finished cylinder bore for out-of-round and taper.
lMeasurement should be done after cylinder bore cools down.
OUTER DIAMETER OF CRANKSHAFT JOURNAL
lMeasure outer diameter of crankshaft journals.
OUTER DIAMETER OF CRANKSHAFT PIN
lMeasure outer diameter of crankshaft pin.Standard : 0.010 - 0.030 mm (0.0004 - 0.0012 in)
Limit : 0.08 mm (0.0031 in)
Rebored size calculation: D = A + B - C
where,
D: Bored diameter
A: Piston diameter as measured
B: Piston - to - bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)
Standard : 54.955 - 54.979 mm (2.1636 - 2.1645 in)
Standard : 44.956 - 44.974 mm (1.7699-1.7706 in)
PBIC0270E