Nissan X-Trail 32. Manual — part 1055
CYLINDER BLOCK
EM-117
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Check with a connecting rod aligner.
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BIG END DIAMETER
• Install connecting rod cap
without connecting rod bearing
installed, and tightening connecting rod cap bolts to the specified
torque. Refer to
EM-107, "Disassembly and Assembly"
.
• Measure the inner diameter of connecting rod big end with an
inside micrometer.
• If out of the standard, replace connecting rod assembly.
CONNECTING ROD BUSHING OIL CLEARANCE
Connecting Rod Bushing Inner Diameter
Measure the inner diameter of connecting rod bushing with an inside
micrometer (A).
Piston Pin Outer Diameter
: Bend
: Torsion
C
: Feeler gauge
Limit
.
JSBIA2514ZZ
: Connecting rod
: Example
: Measuring direction of inner diameter
Standard :
PBIC3269J
Standard :
JPBIA0223ZZ
EM-118
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER BLOCK
Measure the outer diameter of piston pin with a micrometer (A).
Connecting Rod Bushing Oil Clearance
(Connecting rod bushing oil clearance) = (Connecting rod bushing inner diameter) – (Piston pin outer diame-
ter)
• If the measured value is out of the standard, replace connecting rod assembly and/or piston and piston pin
assembly.
• If replacing piston and piston pin assembly. Refer to
.
• If replacing connecting rod assembly. Refer to
EM-125, "Connecting Rod Bearing"
.
CYLINDER BLOCK TOP SURFACE DISTORTION
• Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or
other contamination.
CAUTION:
Be careful not to allow gasket flakes to enter engine oil or engine coolant passages.
• Measure the distortion on the cylinder block upper face at some
different points in six directions with a straight edge (A) and feeler
gauge (B).
• If it exceeds the limit, replace cylinder block.
MAIN BEARING HOUSING INNER DIAMETER
• Install main bearing cap without main bearings installed, and tighten main bearing cap mounting bolts to the
specified torque. Refer to
EM-107, "Disassembly and Assembly"
• Measure the inner diameter of main bearing housing with a cylinder gauge.
• Measure the position shown in the figure [5 mm (0.20 in)] back-
ward from main bearing housing front side in the 2 directions as
shown in the figure. The smaller one is the measured value.
• If out of the standard, replace cylinder block and main bearing
caps assembly.
NOTE:
Main bearing caps cannot be replaced as a single, because it is machined together with cylinder block.
PISTON TO CYLINDER BORE CLEARANCE
Standard :
JSBIA2511ZZ
Standard and Limit
: Refer to
Limit :
Refer
.
JSBIA2526ZZ
: Cylinder block
: Main bearing cap
: Engine front
Standard :
PBIC4005E
CYLINDER BLOCK
EM-119
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
Cylinder Bore Inner Diameter
• Using a cylinder gauge, measure the cylinder bore for wear, out-of-
round and taper at six different points on each cylinder. [
and
directions at
,
, and
] [
is in longitudinal direction of engine]
NOTE:
When determining cylinder bore grade, measure the cylinder bore
direction at
position.
• If the measured value exceeds the limit, or if there are scratches and/or seizure on the cylinder inner wall,
replace cylinder block.
NOTE:
Oversize piston is not provided.
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
[direction ,
position ].
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diame-
ter)
: 10 mm (0.39 in)
: 60 mm (2.36 in)
: 130 mm (5.12 in)
Standard:
Cylinder bore inner diameter
: Refer to
.
Limit:
Out-of-round [Difference between
and
]
Taper [Difference between
and
]
: Refer to
.
JPBIA2059ZZ
Standard :
JPBIA0227ZZ
: Direction A
: Position C
: Position E
: 10 mm (0.39 in)
: 60 mm (2.36 in)
: 130 mm (5.12 in)
Standard and Limit
: Refer to
.
JPBIA2059ZZ
EM-120
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER BLOCK
• If it exceeds the limit, replace piston and piston pin assembly and/or cylinder block. Refer to
.
CRANKSHAFT MAIN JOURNAL DIAMETER
• Measure the outer diameter of crankshaft main journals with a
micrometer (A).
• If out of the standard, measure the main bearing oil clearance.
Then use undersize bearing. Refer to
CRANKSHAFT PIN JOURNAL DIAMETER
• Measure the outer diameter of crankshaft pin journal with a micrometer.
• If out of the standard, measure the connecting rod bearing oil clearance. Then use undersize bearing. Refer
EM-125, "Connecting Rod Bearing"
.
OUT-OF-ROUND AND TAPER OF CRANKSHAFT
• Measure the dimensions at four different points as shown in the
figure on each main journal and pin journal with a micrometer.
• Out-of-round is indicated by the difference in dimensions between
and
at
and
.
• Taper is indicated by the difference in dimension between
and
at
and
.
• 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
main bearing and/or connecting rod bearing. Refer to
EM-125, "Connecting Rod Bearing"
.
CRANKSHAFT RUNOUT
• Place a V-block on a precise flat table to support the journals on the both end of the crankshaft.
• Place a dial indicator (A) straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on the
dial indicator. (Total indicator reading)
• If it exceeds the limit, replace crankshaft.
CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation
Standard :
JPBIA6344ZZ
Standard :
Limit:
Out-of-round [Difference between (X) and (Y)]
Taper [Difference between (A) and (B)]
: Refer to
.
JPBIA0229ZZ
Standard and Limit
: Refer to
JPBIA6345ZZ
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