Nissan Cube. Instruction — part 424
EM-100
< UNIT DISASSEMBLY AND ASSEMBLY >
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
[direction (B), position (D)].
(Clearance) = (Cylinder bore inner diameter) – (Piston skirt diame-
ter)
• 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-122, "Connecting Rod Bearing"
.
OUT-OF-ROUND AND TAPER OF CRANKSHAFT
Standard :
PBIC3272J
A
: Direction A
C
: Position C
E
: Position E
f
: 10 mm (0.39 in)
g
: 60 mm (2.36 in)
h
: 130 mm (5.12 in)
Standard and Limit
: Refer to
.
JPBIA2059ZZ
Standard :
PBIC3457J
Standard :
CYLINDER BLOCK
EM-101
< UNIT DISASSEMBLY AND ASSEMBLY >
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E
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• 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
(X) and (Y) at (A) and (B).
• Taper is indicated by the difference in dimension between (A) and
(B) at (X) and (Y).
• 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-107, "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
• Install connecting rod bearings (2) to connecting rod (3) and con-
necting rod bearing cap (1), and tighten connecting rod cap bolts to
the specified torque. Refer to
EM-87, "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-87, "Disassembly and Assembly"
.
CAUTION:
Never rotate crankshaft.
Limit:
Out-of-round [Difference between (X) and (Y)]
Taper [Difference between (A) and (B)]
: Refer to
PBIC3459J
Standard and Limit
: Refer to
PBIC3458J
A
: Example
B
: Inner diameter measuring direction
Standard and Limit
: Refer to
EM-122, "Connecting Rod Bearing"
PBIC3275J
EM-102
< UNIT DISASSEMBLY AND ASSEMBLY >
CYLINDER BLOCK
• 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 (3) to cylinder block (1) and main bearing cap
(2), 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 with a bore 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.
• Install main bearings to cylinder block and main bearing cap, and tighten main bearing cap mounting bolts to
the specified torque. Refer to
EM-87, "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
PBIC3276J
A
: Example
B
: Inner diameter measuring direction
Standard and Limit
: Refer to
.
PBIC3277J
PBIC3278J
CYLINDER BLOCK
EM-103
< UNIT DISASSEMBLY AND ASSEMBLY >
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• When main bearing cap is removed after being tightened to the
specified torque with main bearings (1) installed, the tip end of
bearing must protrude (B). 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 (1) installed, the tip
end of bearing must protrude (B). 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 (B) 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
• 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 INTAKE VALVE TIMING CONTROL)
A
: Example
Standard
: There must be crush height.
PBIC3279J
A
: Example
Standard
: There must be crush height.
PBIC3279J
A
: (d1) measuring position
B
: (d2) measuring position
Limit [(d
1
) – (d
2
)]: 0.15 mm (0.0059 in)
PBIC4015E
Limit: 7.75 mm (0.3051 in)
PBIC4016E
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