Nissan Juke F15. Manual - part 681

EM-278

< UNIT DISASSEMBLY AND ASSEMBLY >

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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 

EM-279, "Inspection"

.

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 

EM-314, "Cylinder Head"

.

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 >

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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 

EM-294,

"Inspection"

.

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 

EM-314, "Cylinder Head"

.

PBIC3207J

EM-280

< 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 

EM-

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 

EM-314, "Cylinder Head"

.

JSBIA1166ZZ

Stan-
dard

: Refer to 

EM-314, "Cylinder Head"

.

Limit

PBIC3213J

A

:  OK

B

:  Not  OK

C

:  Not  OK

PBIC3216J

B

: Place in contact

C

:  V-block

Limit : Refer to 

EM-314, "Cylinder Head"

.

JSBIA4163ZZ

CYLINDER HEAD

EM-281

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• 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 

EM-314, "Cylinder Head"

.

EMA0481D