Nissan Juke F15. Manual — part 681
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< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
CYLINDER HEAD
d. Cut the valve seat to the specified dimensions using a valve
seat cutter set and valve seat grinder (commercial service tool).
CAUTION:
When using a valve seat cutter, hold the cutter handle firmly
with both hands, and press the cutter to cut the entire
periphery of the contacting face in one motion without stop-
ping. If the cutter is not pressed correctly, or if the cutter is
taken away and pressed again on the surface multiple
times, a stage valve seat may result.
e. Using an abrasive compound, grind to adjust valve seat.
f.
Check parts again. Check that the valve seat contact is normal. Refer to
.
3. Install valve oil seals.
• Using a valve oil seal drift [SST: KV10115600 (J-38958)] (A),
press-fit to the dimensions specified in the figure.
4. Install valves.
• Valves of larger diameter is installed to the intake side.
5. Install valve springs.
• Face the narrower pitch side [valve spring seat (1) press-fitted
side] toward cylinder head (B).
• Parts for intake and exhaust are different. When installing
them, check the identification colors.
6. Install valve spring retainers.
7. Install valve collets.
• Use a valve spring compressor [SST: KV10116200 (J-26336-
A)] (A), adapter [SST: KV10109220 ( — )] (B), and attachment
[SST: KV10115900 (J-26336-20)] (C), and compress the valve
spring. Then, use a magnetic screwdriver or an equivalent and
install the valve collet.
Ream-
ing di-
mensio
n
: Refer to
Installation height H : 15.1 – 15.7 mm (0.59 – 0.62
in)
EMQ0120D
PBIC3211J
A : Identification color
Intake
: White
Exhaust
: Yellow-
ish green
JPBIA4479ZZ
JPBIA1365ZZ
CYLINDER HEAD
EM-279
< 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
CAUTION:
• Never damage the valve lifter hole while working.
• Align the centers of the attachment [SST: KV10115900
(J-26336-20)] (A) and valve spring retainer (1).
• After installing, tap valve stem tip with a plastic hammer to ensure a proper fit.
8. Install valve lifter.
• Install them in their original positions.
9. Install spark plugs.
• Use a spark plug wrench (commercial service tool).
Inspection
INFOID:0000000012197440
INSPECTION AFTER REMOVAL
Cylinder Head Bolt Outer Diameter
• Measure the outer diameter at two locations (d1 and d2) shown in
the figure.
CAUTION:
When there is another narrowed point within the thread area,
use this point as d2.
• Calculate the difference between d1 and d2.
• Replace cylinder head bolt if limit is exceeded.
Cylinder Head Distortion
NOTE:
Check the distortion of the cylinder block top surface at the same time as this inspection. Refer to
1. Using a scraper, remove oil, scale, gasket, sealant, and carbon deposits from surface of cylinder head.
CAUTION:
Never allow gasket fragments to enter oil or engine coolant passages.
2. Check flatness of cylinder head lower surface using a straight-
edge (A) and a feeler gauge (B). Measure distortion, at several
points each in six directions.
• Replace cylinder head if the limit is exceeded.
INSPECTION AFTER DISASSEMBLY
Valve Dimensions
JPBIA4477ZZ
Limit : 0.15 mm (0.0059 in)
PBIC3320J
Limit : Refer to
.
PBIC3207J
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< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
CYLINDER HEAD
• Using a micrometer, measure dimensions at the points shown in
the figure.
• If it exceeds the standard, replace valve.
Valve Guide Clearance
Calculate the clearance by measuring valve stem outer diameter
and guide hole diameter using a micrometer (A) and a bore gauge.
• Replace the valve guide bolt if it exceeds the limit. Refer to
275, "Disassembly and Assembly"
.
Valve Seat Contact
• This inspection must be done after ensuring that the dimensions of the valve guide and the valve are within
the standard.
• Apply DICATOL PL
−1 to valve seat and valve face contact surfaces and check valve seating condition.
• Make sure that all connection surfaces are completely connected
around.
• Reseat the valve and check again for incorrect seating condition.
Replace valve seat if seating condition cannot be corrected by
reseating.
Valve Spring Squareness
Set the valve spring against a square (A). Rotate the spring and
record the maximum clearance (d) between spring upper end and
the square.
CAUTION:
Never remove valve spring seat (assembly parts).
• Replace valve spring if the limit is exceeded.
Valve Spring Dimension and Inspection Load
Stan-
dard
: Refer to
JSBIA1166ZZ
Stan-
dard
: Refer to
Limit
PBIC3213J
A
: OK
B
: Not OK
C
: Not OK
PBIC3216J
B
: Place in contact
C
: V-block
Limit : Refer to
.
JSBIA4163ZZ
CYLINDER HEAD
EM-281
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR EXCEPT FOR NISMO RS MODELS]
C
D
E
F
G
H
I
J
K
L
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A
EM
N
P
O
• Check with a valve spring tester.
CAUTION:
Never remove valve spring seat (assembly parts).
NOTE:
The following standard is for the valve spring seat assembly.
• If valve-opening load exceeds the standard, replace valve spring.
Stan-
dard
: Refer to
EMA0481D
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