Nissan X-Trail 32. Instruction — part 1056
CYLINDER BLOCK
EM-121
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
C
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• Install connecting rod bearings
to connecting rod
and con-
necting rod bearing cap
, and tighten connecting rod cap bolts to
the specified torque. Refer to
EM-107, "Disassembly and Assem-
• Measure the inner diameter of connecting rod bearing with an
inside micrometer.
(Bearing oil clearance) = (Connecting rod bearing inner diameter)
– (Crankshaft pin journal diameter)
• If clearance exceeds the limit, select proper connecting rod bearing according to connecting rod big end
diameter and crankshaft pin journal diameter to obtain specified bearing oil clearance. Refer to
.
Method of Using Plastigage
• Remove engine oil and dust on crankshaft pin 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 cap, and tighten connecting rod cap bolts to the speci-
EM-107, "Disassembly and Assembly"
CAUTION:
Never rotate crankshaft.
• Remove connecting rod cap and bearing, and using the scale (A)
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 cap
, and tighten main bearing cap mounting bolts to the specified
EM-107, "Disassembly and Assembly"
.
• Measure the inner diameter of main bearing with a cylinder gauge.
(Bearing oil clearance) = (Main bearing inner diameter) – (Crank-
shaft main journal diameter)
• If clearance exceeds the limit, select proper main bearing according to main bearing inner diameter 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 a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil
holes.
: Example
: Inner diameter measuring direction
Standard and Limit
: Refer to
EM-140, "Connecting Rod Bearing"
PBIC3275J
JPBIA6346ZZ
: Example
: Inner diameter measuring direction
Standard and Limit
: Refer to
.
PBIC3277J
EM-122
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER BLOCK
• Install main bearings to cylinder block and main bearing cap, and tighten main bearing cap mounting bolts to
the specified torque. Refer to
EM-107, "Disassembly and Assembly"
CAUTION:
Never rotate crankshaft.
• Remove main bearing cap and bearings, and using the scale (A)
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 CRUSH HEIGHT
• When main bearing cap is removed after being tightened to the
specified torque with main bearings
installed, the tip end of
bearing must protrude
. Refer to
• If the standard is not met, replace main bearings.
CONNECTING ROD BEARING CRUSH HEIGHT
• When connecting rod cap is removed after being tightened to the
specified torque with connecting rod bearings
installed, the tip
end of bearing must protrude
. Refer to
.
• If the standard is not met, replace connecting rod bearings.
MAIN BEARING CAP BOLT OUTER DIAMETER
• Measure the outer diameters (d
1
) and (d
2
) at two positions as
shown in the figure.
• If reduction appears in places other than
range, regard it as (d
2
).
• If it exceeds the limit (a large difference in dimensions), replace
main bearing cap mounting bolt with a new one.
CONNECTING ROD CAP BOLT OUTER DIAMETER
JPBIA6347ZZ
: Example
Standard
: There must be crush height.
PBIC3279J
: Example
Standard
: There must be crush height.
PBIC3279J
: (d1) measuring position
: (d2) measuring position
Limit [(d
1
) – (d
2
)]: 0.15 mm (0.0059 in)
PBIC4015E
CYLINDER BLOCK
EM-123
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
C
D
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F
G
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EM
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• Measure the outer diameter (d) at position as shown in the figure.
• If reduction appears in a position other than (d), regard it as (d).
• When (d) exceeds the limit (when it becomes thinner), replace
connecting rod cap bolt with a new one.
CLOGGED OR DAMAGED OIL FILTER (FOR VALVE TIMING CONTROL)
• Check that there is no foreign material on the oil filter and check it
for clogging.
- Clean it if necessary.
• Check the oil filter for damage.
- Replace it if necessary.
Limit: 7.75 mm (0.3051 in)
PBIC4016E
PBIC3273J
EM-124
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
HOW TO SELECT PISTON AND BEARING
HOW TO SELECT PISTON AND BEARING
Description
INFOID:0000000010783735
• The identification grade stamped on each part is the grade for the dimension measured in new condition.
This grade cannot apply to reused parts.
• For reused or repaired parts, measure the dimension accurately. Determine the grade by comparing the
measurement with the values of each selection table.
• For details of the measurement method of each part, the reuse standards and the selection method of the
selective fitting parts, refer to the text.
Piston
INFOID:0000000010783736
WHEN NEW CYLINDER BLOCK IS USED
• Check the cylinder bore grade on rear left side of cylinder block
,
and select piston of the same grade.
• If there is a correction stamp mark on the cylinder block, use it as a
correct reference.
WHEN CYLINDER BLOCK IS REUSED
1.
Measure the cylinder bore inner diameter. Refer to
.
2.
Determine the bore grade by comparing the measurement with the values under the cylinder bore inner
diameter of the “Piston Selection Table”.
Selection points
Selection parts
Selection items
Selection methods
Between cylinder block and
crankshaft
Main bearing
Main bearing grade (bearing
thickness)
Determined by match of cylin-
der block bearing housing
grade (inner diameter of hous-
ing) and crankshaft journal
grade (outer diameter of jour-
nal)
Between crankshaft and con-
necting rod
Connecting rod bearing
Connecting rod bearing grade
(bearing thickness)
Combining service grades for
connecting rod big end diame-
ter and crankshaft pin outer di-
ameter determine connecting
rod bearing selection.
Between cylinder block and pis-
ton
Piston and piston pin assembly
(piston is available together with
piston pin as an assembly.)
Piston grade (piston outer diam-
eter)
Piston grade = cylinder bore
grade (inner diameter of bore)
: Correction stamp
: Standard stamp
: Cylinder No. 1 bore grade
: Cylinder No. 2 bore grade
: Cylinder No. 3 bore grade
: Cylinder No. 4 bore grade
: No. 1 main bearing housing grade
: No. 2 main bearing housing grade
: No. 3 main bearing housing grade
: No. 4 main bearing housing grade
: No. 5 main bearing housing grade
: Engine front
PBIC3264J
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