Nissan X-Trail 32. Manual — part 1127
CYLINDER BLOCK
EM-405
< UNIT DISASSEMBLY AND ASSEMBLY >
[R9M]
C
D
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• Measure the inner diameter of main bearing housing with a bore
gauge.
• If it exceeds the standard, replace cylinder block and main bearing
caps assembly.
NOTE:
Main bearing caps cannot be replaced individually, because it is
machined together with the cylinder block.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Inner Diameter
• Using a bore gauge, measure the cylinder bore for wear, out-of-round and taper at six different points on
each cylinder.
• If it exceeds the standard, or if there are scratches and/or seizure on the cylinder inner wall, replace cylinder
block.
Piston Skirt Diameter
Measure the outer diameter of piston skirt with a micrometer (A).
Piston to Cylinder Bore Clearance
Calculate by piston skirt diameter and cylinder bore inner diameter.
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diameter)
• If it exceeds the standard, replace piston and piston pin assembly and/or cylinder block.
CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation
: Cylinder block
: Main bearing cap
Standard :
JPBIA0225ZZ
Standard:
Cylinder bore inner diameter
: Refer to
.
Standard :
Measure point
: Refer to
JPBIA0227ZZ
Standard
: Refer to
.
EM-406
< UNIT DISASSEMBLY AND ASSEMBLY >
[R9M]
CYLINDER BLOCK
• 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-390, "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 it exceeds the standard. Replace connecting rod bearing or/and connecting rod.
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-
fied torque. Refer to
EM-390, "Disassembly and Assembly"
CAUTION:
Never rotate crankshaft.
• Remove connecting rod cap and bearing, and using the scale on
the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the standard is
the same as that described in “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-390, "Disassembly and Assembly"
.
• Measure the inner diameter of main bearing with a bore gauge.
(Bearing oil clearance) = (Main bearing inner diameter) – (Crank-
shaft main journal diameter)
• If it exceeds the standard, 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 the crankshaft axial direction, avoiding
oil holes.
• Install main bearings to cylinder block and main bearing cap, and tighten main bearing cap mounting bolts to
the specified torque. Refer to
EM-390, "Disassembly and Assembly"
CAUTION:
Never rotate crankshaft.
Standard :
Refer
.
JPBIA0230ZZ
JPBIA0231ZZ
Standard
: Refer to
.
JPBIA0232ZZ
CYLINDER BLOCK
EM-407
< UNIT DISASSEMBLY AND ASSEMBLY >
[R9M]
C
D
E
F
G
H
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K
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M
A
EM
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P
O
• Remove main 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 standard is
the same as that described in “Method by Calculation”.
FLYWHEEL INSPECTION
For a dual mass flywheel which has worked: presence of a free rotation angle. This angle is measured by fix-
ing the primary flywheel and turning the secondary flywheel. The dual mass flywheel free rotation angle must
not exceed 15
°
or 30mm (1.2 in) in linear movement measured on the edge.
JPBIA0231ZZ
EM-408
< UNIT DISASSEMBLY AND ASSEMBLY >
[R9M]
HOW TO SELECT PISTON AND BEARING
HOW TO SELECT PISTON AND BEARING
Description
INFOID:0000000010784367
• 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.
Main Bearing
INFOID:0000000010784368
WHEN NEW CYLINDER BLOCK AND CRANKSHAFT ARE USED
1.
“Main Bearing Selection Table” rows correspond to main bearing
housing grade on rear side of cylinder block.
NOTE:
This engine only has one cylinder bore grade.
: Cylinder block bearing diameter category:
• Identification by letter of the crankshaft bearing diameter,
• the order of the marking letters goes from the bearing on the
timing end to the bearing on the flywheel end.
•
: cylinder diameter category.
•
: marking only for factory use.
WORKING OUT THE CLASS OF MAIN BEARING (ORIGINAL FITMENT)
Marking On The Crankshaft
Identify the category of crankshaft main journal diameter with checking the marking of crankshaft as shown in
the figures.
NOTE:
The marking has 5 digits. Left end is the diameter category of No. 1 bearing (flywheel side) and right end is the
diameter category of No. 5 bearing (sprocket side).
Detail of the marking:
: Line indicating the diameter category of the journal.
- identification by letters corresponding to the diameter of the journal
- the order of the marking letters goes from the bearing on the timing
end to the bearing on the flywheel end,
:Line indicating the diameter class of the crankpins,
Selection points
Selection parts
Selection items
Selection methods
Between cylinder block and
crankshaft
Main bearing
Main bearing grade
(bearing thickness)
Determined by match of cylinder block
bearing housing grade (inner diameter of
housing) and crankshaft journal grade
(outer diameter of journal)
Piston protrusion
Piston
Piston grade (piston height)
Refer to
.
E1BIA0564ZZ
E1BIA0543ZZ
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