Nissan Cube. Instruction — part 423
EM-96
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• Measure the side clearance between connecting rod and crank-
shaft arm with a feeler gauge (A).
• If the measured value exceeds the limit, replace connecting rod,
and measure again. If it still exceeds the limit, replace crankshaft
also.
PISTON TO PISTON PIN OIL CLEARANCE
Piston Pin Hole Diameter
Measure the inner diameter of piston pin hole with an inside
micrometer (A).
Piston Pin Outer Diameter
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
.
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
Standard and Limit
: Refer to
.
PBIC3251J
Standard
: Refer to
.
PBIC3265J
Standard :
Refer
.
PBIC3266J
Standard :
CYLINDER BLOCK
EM-97
< UNIT DISASSEMBLY AND ASSEMBLY >
C
D
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• 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 (1) and piston ring (2), and
then insert (A) piston ring until middle of cylinder (B) 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, rebore cylinder and use
oversized piston and piston rings.
CONNECTING ROD BEND AND TORSION
• Check with a connecting rod aligner.
• If it exceeds the limit, replace connecting rod assembly.
CONNECTING ROD BIG END DIAMETER
Standard and Limit
: Refer to
PBIC3280J
Standard and Limit
: Refer to
PBIC3267J
A
: Bend
B
: Torsion
C
: Feeler gauge
Limit
PBIC3268J
EM-98
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• Install connecting rod cap (1) without connecting rod bearing
installed, and tightening connecting rod cap bolts to the specified
torque. Refer to
EM-87, "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
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-107, "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.
2
: Connecting rod
A
: Example
B
: Measuring direction of inner diameter
Standard :
PBIC3269J
Standard :
PBIC3270J
Standard :
PBIC3266J
Standard and Limit
: Refer to
CYLINDER BLOCK
EM-99
< UNIT DISASSEMBLY AND ASSEMBLY >
C
D
E
F
G
H
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A
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• 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-87, "Disassembly and Assembly"
• Measure the inner diameter of main bearing housing with a bore 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
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. [(A) and (B)
directions at (C), (D), and (E)] [(A) is in longitudinal direction of
engine]
NOTE:
When determining cylinder bore grade, measure the cylinder bore
(B) direction at (D) 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.
Limit :
Refer
.
PBIC3250J
1
: Cylinder block
2
: Main bearing cap
: Engine front
Standard :
PBIC4005E
f
: 10 mm (0.39 in)
g
: 60 mm (2.36 in)
h
: 130 mm (5.12 in)
Standard:
Cylinder bore inner diameter
: Refer to
Limit:
Out-of-round [Difference between (A) and (B)]
Taper [Difference between (C) and (D)]
: Refer to
JPBIA2059ZZ
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