Nissan Juke F15. Manual — part 686
EM-298
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
CYLINDER BLOCK
NOTE:
Piston and piston pin are service parts for assembly.
- When replacing the connecting rod, refer to
EM-304, "Selective-fit Service Parts"
rod bearing.
Cylinder Block Upper Surface Distortion
• Remove old gasket on cylinder block upper surface using a scraper. Also remove oil, scale, and carbon
deposits.
CAUTION:
Never allow gasket fragments to enter oil or engine coolant passages.
• Check flatness of cylinder block upper surface using a straight-
edge (A) and a feeler gauge (B). Measure distortion, at several
points each in six directions.
• If the limit is exceeded, replace the cylinder block.
- When replacing the cylinder block, refer to
Main Bearing Housing Inner Diameter
• Without installing main bearing, install main bearing cap, and tighten main bearing cap bolts to the specified
torque.
- For main bearing cap bolt tightening procedure, refer to
EM-287, "Disassembly and Assembly"
.
• Measure the main bearing housing inside diameter with a bore gauge.
• Measure the position shown in the figure (5 mm rearward from
main bearing housing front side end surface) in two directions, as
shown in the figure. Use the smaller one as the measured value.
• If the result is outside the standard, replace the cylinder block.
NOTE:
Main bearing cap is machined together with cylinder block, so they cannot be replaced separately.
- When replacing the cylinder block, refer to
EM-304, "Selective-fit Service Parts"
and select the main bearing.
Piston-to-cylinder Bore Clearance
Cylinder bore inner diameter
• Use a bore gauge and measure at three points from the top of the
engine (upper, middle, lower: “C”, “D”, and “E” as shown in the fig-
ure) in two directions (“A”, “B”) for measurement at a total of six
points.
NOTE:
The measurement point for bore grade is 60 mm below the cylin-
der head mounting surface (position “D” in the figure). Measure the
dimension in the engine LH/RH directions (“B” in the figure).
Limit : Refer to
PBIC3250J
1
: Cylinder block
2
: Main bearing cap
: Engine front
Stan
dard
: Refer to
PBIC3271J
f
: 10 mm (0.39 in)
g
: 60 mm (2.36 in)
h
: 130 mm (5.12 in)
JPBIA2059ZZ
CYLINDER BLOCK
EM-299
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
C
D
E
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• Replace the cylinder block if the limit is exceeded, or if damage or seizure is found on cylinder inner wall.
NOTE:
There is no service setting for oversized piston
- When replacing the cylinder block, refer to
EM-304, "Selective-fit Service Parts"
and select the main bearing.
Piston outer diameter
• Measure piston skirt outer diameter using a micrometer (A).
How to calculate piston-to-cylinder bore clearance
• Calculate from the piston skirt outer diameter and the cylinder bore
inner diameter (measured at position “D” in direction “B”).
(Clearance) = (Cylinder bore inner diameter) - (Piston skirt outer
diameter)
• If the limit is exceeded, refer to the standard for each part standard, and replace the connecting rod and/or
the piston and piston pin assembly.
- When replacing piston and piston assembly, refer to
EM-304, "Selective-fit Service Parts"
and select the cor-
rect parts.
NOTE:
Piston and piston pin are service parts for assembly.
- When replacing the cylinder block, refer to
EM-304, "Selective-fit Service Parts"
and select the main bearing.
Crankshaft Main Journal Diameter
Cylinder bore inner diameter standard
: Refer to
Out-of-round limit (difference between measure-
ments X and Y)
Taper limit (difference between measurements A and
C)
: Refer to
Stan-
dard
: Refer to
.
PBIC3272J
f
: 10 mm (0.39 in)
g
: 60 mm (2.36 in)
h
: 130 mm (5.12 in)
Stan
dard
: Refer to
Limit
JPBIA2059ZZ
EM-300
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
CYLINDER BLOCK
• Measure the main journal outer diameter using a micrometer (A).
• If it is outside the standard, check the main bearing oil clearance
and use the undersize bearing. Refer to "Main bearing oil clear-
ance."
Crankshaft Pin Journal Diameter
• Measure the main journal outer diameter using a micrometer.
• If it is outside the standard, check the connecting rod bearing oil clearance and use the undersize bearing.
Refer to "Connecting rod bearing oil clearance."
Out-of-round and Taper of Crankshaft
• Measure each main journal and pin journal at four locations shown
in the figure using a micrometer.
• Out-of-round is indicated by the difference between the dimen-
sions at positions “A” and “B” measured in directions “X” and “Y”.
• Taper is indicated by the difference between the dimensions in
directions “X” and “Y” measured at positions “A” and “B”.
• Correct or replace the crankshaft if it exceeds the limit.
- If repair is performed, check the oil clearance and select the main
bearing and connecting rod bearing. Refer to "Main bearing oil
clearance" or "Connecting rod bearing oil clearance."
- When replacing the crankshaft, refer to
EM-304, "Selective-fit Service Parts"
and connecting rod bearing.
Crankshaft Runout
• Set a pair of V-blocks on a level block and support journals at both ends of crankshaft.
• Set a dial indicator (A) vertically onto journal No. 3.
• Rotate crankshaft one rotation and read indication on the indicator.
• Replace crankshaft if the limit is exceeded.
- When replacing the crankshaft, refer to
and select the main bearing and connecting rod bear-
ing.
Connecting Rod Bearing Oil Clearance
Using calculation
Stan
dard
: Refer to
PBIC3457J
Stan
dard
: Refer to
Limit
: Refer to
.
PBIC3459J
Stan
dard
: Refer to
Limit
PBIC3458J
CYLINDER BLOCK
EM-301
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Install connecting rod bearing (2) onto connecting rod (3) and con-
necting rod cap (1). Tighten connecting rod bolts to the specified
torque. Using an inside micrometer, measure connecting rod inner
diameter.
- For the connecting rod bolt tightening procedure, refer to
.
• Measure crankshaft pin journal diameter. Refer to "Crankshaft pin
journal diameter."
• (Oil clearance) = (Connecting rod bearing inner diameter) - (Camshaft pin journal outer diameter)
• If the limit is exceeded, select a connecting rod bearing according to the dimensions of the crankshaft pin
journal outer diameter, so that engine oil clearance is within the standard. Refer to
Using plastigage
• Completely wipe away oil and dust on crankshaft pin journal and bearing surfaces.
• Cut a piece of plastigage slightly shorter than bearing width, and place it in axial direction. Be careful not to
interfere with oil hole.
• Install connecting rod bearing to connecting rod and connecting rod cap. Tighten connecting rod bolts to the
specified torque.
- For the connecting rod bolt tightening procedure, refer to
EM-287, "Disassembly and Assembly"
CAUTION:
Never rotate crankshaft while plastigage is in place.
• Remove connecting rod cap and bearing. Measure width of the
plastigage using scale (A) printed on its bag.
NOTE:
If the limit is exceeded, follow the procedure in "Using calculation".
Main Bearing Oil Clearance
Using calculation
• Install main bearing (3) onto cylinder block (1) and main bearing
cap (2). Tighten main bearing cap bolts to the specified torque.
Using a bore gauge, measure main bearing inner diameter.
- For main bearing cap bolt tightening procedure, refer to
.
• Measure crankshaft main journal diameter. Refer to "Crankshaft
main journal diameter."
• (Oil clearance) = (Connecting rod bearing inner diameter) - (Cam-
shaft main journal outer diameter)
A : Image
B
: Inner diameter
measurement di-
rection
Stan
dard
: Refer to
Limit
PBIC3275J
JPBIA4438ZZ
A : Image
B
: Inner diameter measure-
ment direction
PBIC3277J
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