Nissan X-Trail 32. Manual — part 1090
CYLINDER BLOCK
EM-257
< UNIT DISASSEMBLY AND ASSEMBLY >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
Measure the outer diameter of piston pin with a micrometer (A).
Piston to Piston Pin Oil Clearance
(Piston to piston pin oil clearance) = (Piston pin hole diameter) – (Piston pin outer diameter)
• If oil clearance is out of the standard, replace piston and piston pin assembly.
• When replacing piston and piston pin assembly, refer to "PISTON TO CYLINDER BORE CLEARANCE".
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
grades can be selected. (Only grade “0” is available.)
PISTON RING SIDE CLEARANCE
• Measure the side clearance of piston ring and piston ring groove
with a feeler gauge (A).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, replace piston also.
PISTON RING END GAP
• Check that cylinder bore inner diameter is within specification. Refer to “PISTON TO CYLINDER BORE
CLEARANCE”.
• Lubricate with new engine oil to piston
and piston ring
, and
then insert
piston ring until middle of cylinder
with piston, and
measure piston ring end gap with a feeler gauge (C).
• If the measured value exceeds the limit, replace piston ring, and
measure again. If it still exceeds the limit, replace cylinder block.
CONNECTING ROD BEND AND TORSION
Standard :
JSBIA2511ZZ
Standard :
.
Standard and Limit
: Refer to
JSBIA2512ZZ
Standard and Limit
: Refer to
JSBIA2513ZZ
EM-258
< UNIT DISASSEMBLY AND ASSEMBLY >
[QR25DE]
CYLINDER BLOCK
• 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 bolts to the specified
torque. Refer to
• 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
: Refer to
.
JSBIA2514ZZ
: Connecting rod
: Example
B
: Measuring direction of inner diameter
Standard :
.
JSBIA2521ZZ
Standard
: Refer to
.
JPBIA0223ZZ
CYLINDER BLOCK
EM-259
< UNIT DISASSEMBLY AND ASSEMBLY >
[QR25DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
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-266, "Connecting Rod Bearing"
to select connecting rod
bearing.
CYLINDER BLOCK 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 a
feeler gauge (B).
• If it exceeds the limit, replace cylinder block.
MAIN BEARING HOUSING INNER DIAMETER
• Install lower cylinder block
without main bearings installed, and
tighten lower cylinder block mounting bolts to the specified torque.
Refer to
EM-248, "Disassembly and Assembly"
for the tightening
procedure.
• Measure the inner diameter of main bearing housing with a bore
gauge.
• If out of the standard, replace cylinder block
and lower cylinder
block assembly.
NOTE:
Cylinder block cannot be replaced as a single, because it is
machined together with lower cylinder block.
PISTON TO CYLINDER BORE CLEARANCE
Cylinder Bore Inner Diameter
Standard :
.
JPBIA0218ZZ
Standard
: Refer to
.
Limit :
Refer
JSBIA2526ZZ
Standard :
Refer
JPBIA0225ZZ
EM-260
< UNIT DISASSEMBLY AND ASSEMBLY >
[QR25DE]
CYLINDER BLOCK
• 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.
CAUTION:
When using an oversize piston, use oversize pistons for all cylinders with oversize piston rings.
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)
: 120 mm (4.72 in)
Standard:
Cylinder bore inner diameter
: Refer to
Limit:
Out-of-round (Difference between
and
)
Taper (Difference between
and
)
: Refer to
.
Oversize (O/S): 0.2 mm (0.008 in)
JPBIA2059ZZ
Standard :
.
JPBIA0227ZZ
: Direction A
: Position C
: Position E
: 10 mm (0.39 in)
: 60 mm (2.36 in)
: 120 mm (4.72 in)
Standard and Limit
: Refer to
JPBIA2059ZZ
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