Nissan Versa Note. Manual - part 391

EM-80

< REMOVAL AND INSTALLATION >

[HR16DE]

CYLINDER HEAD

• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between “d1” and “d2”

exceeds the limit, replace them with a new one. 

• If reduction of outer diameter appears in a position other than “d2”,

use it as “d2” point.

Cylinder Head Distortion

NOTE:

When performing this inspection, cylinder block distortion should be also checking. Refer to 

EM-101, "Inspec-

tion"

.

1. Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. using scraper.

CAUTION:

Use utmost care not to allow gasket debris to enter passages for engine oil or engine coolant.

2. At each of several locations on bottom surface of cylinder head,

measure the distortion in six directions using suitable tools (A/

B).

• If it exceeds the limit, replace cylinder head.

INSPECTION AFTER DISASSEMBLY

VALVE DIMENSIONS

• Check the dimensions of each valve. For the dimensions, refer to 

EM-118, "Cylinder head"

.

• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to “VALVE SEAT

CONTACT”.

VALVE GUIDE CLEARANCE

Valve Stem Diameter

• Measure the diameter of valve stem using suitable tool (A).

Valve Guide Inner Diameter

• Measure the inner diameter of valve guide using suitable tool (A).

Valve Guide Clearance

• (Valve guide clearance) = (Valve guide inner diameter) – (Valve

stem diameter)

• If the calculated value exceeds the limit, replace valve and/or valve guide. Refer to 

EM-78, "Disassembly

and Assembly"

.

VALVE GUIDE REPLACEMENT

When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.

Limit (“d1”–“d2”): 0.15 mm (0.0059 in)

PBIC3717E

Limit

: Refer to 

EM-118, "Cylinder head"

.

PBIC3207J

Standard

: Refer to 

EM-118, "Cylinder head"

.

Standard

: Refer to 

EM-118, "Cylinder head"

.

Standard and Limit

: Refer to 

EM-118, "Cylinder head"

.

PBIC3213J

CYLINDER HEAD

EM-81

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1. To remove valve guide, heat cylinder head to 110 to 130

°C (230

to 266

°F) by soaking in heated oil.

2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US

ton, 2.0 lmp ton) force] or suitable tool.

WARNING:

Cylinder head contains heat; when working, wear protective

equipment to avoid getting burned.

3. Ream cylinder head valve guide hole with a suitable tool.

4. Heat cylinder head to 110 to 130

°C (230 to 266°F) by soaking in

heated oil.

5. Using a suitable tool, press valve guide (1) from camshaft side

of cylinder head (2) to dimensions as shown.

WARNING:

Cylinder head contains heat; when working, wear protective

equipment to avoid getting burned.

SEM008A

SEM931C

Valve guide hole diameter (for service parts):

Intake and exhaust

: 9.175 - 9.201 mm (0.3612 - 0.3622 in)

SEM932C

SEM008A

Projection “H”: : 11.4 - 11.8 mm (0.448 - 0.464 in)

PBIC3217J

EM-82

< REMOVAL AND INSTALLATION >

[HR16DE]

CYLINDER HEAD

6. Apply reamer finish to valve guide with a suitable tool.

VALVE SEAT CONTACT

• After confirming that the dimensions of valve guides and valves are within the specifications, perform this

procedure.

• Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve

contact on the surface.

• Check if the contact area band is continuous all around the circum-

ference.

• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” conditions (B) even after the recheck,

replace valve seat. Refer to 

EM-78, "Disassembly and Assembly"

.

VALVE SEAT REPLACEMENT

When valve seat is removed, replace with oversized [0.5 mm (0.020 in)] valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess

in cylinder head. Set the machine depth stop to ensure this.

CAUTION:

Prevent scoring cylinder head by excessive boring.

2. Ream cylinder head recess diameter for service valve seat.

• Be sure to ream in circles concentric to the valve guide center.

This will enable valve seat to fit correctly.

3. Heat cylinder head to 110 to 130

°C (230 to 266°F) by soaking in

heated oil.

4. Provide valve seats cooled well with dry ice. Press-fit valve seats into cylinder head.

Standard

5.000 - 5.018 mm (0.1968 - 0.1975 in)

SEM932C

(A)

: OK

JPBIA0187ZZ

Oversize [0.5 mm (0.020 in)]

Intake

: 32.500 - 32.527 mm (1.2795 - 1.2805 in)

Exhaust

: 26.400 - 26.427 mm (1.0393 - 1.0404 in)

SEM795A

SEM008A

CYLINDER HEAD

EM-83

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WARNING:

Cylinder head contains heat; when working, wear protective equipment to avoid getting burned.

CAUTION:

Avoid directly touching cold valve seats.

5. Using a suitable tool finish valve seat to the specified dimen-

sions. For dimensions, refer to 

MA-11, "Fluids and Lubricants"

.

CAUTION:

When using a valve seat cutter, firmly grip the cutter handle

with both hands. Then, press the contacting surface evenly

around the valve seat to cut in a single attempt. Improper

pressure or cutting several times may result in wavy valve

seat. 

6. Using compound, grind to adjust valve fitting. 
7. Check again for normal contact. Refer to "VALVE SEAT CONTACT".

VALVE SPRING SQUARENESS

• Set a tri-square (A) along the side of valve spring and rotate spring.

Measure the maximum clearance between the top of spring and

tri-square.

• If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

• Check valve spring pressure with valve spring seat installed at the

specified spring height.

CAUTION:

Do not remove valve spring seat from valve spring.

• If the installation load or load with valve open is out of the stan-

dard, replace valve spring (with valve spring seat).

INSPECTION AFTER INSTALLATION

• Before starting engine, check oil/fluid levels, including engine coolant and engine oil. If less than required

quantity, fill to the specified level. Refer to 

MA-11, "Fluids and Lubricants"

.

• Use procedure below to check for fuel leaks.

• Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leaks

at connection points.

• Start engine. With engine speed increased, check again for fuel leaks at connection points.

• Run engine to check for unusual noise and vibration.

NOTE:

If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide

may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop

after hydraulic pressure rises.

• Warm up engine thoroughly to make sure there are no leaks of fuel, exhaust gas, or any oils/fluids including

engine oil and engine coolant.

• Bleed air from passages in lines and hoses, such as in cooling system.

SEM934C

(B)

: Contact

Limit

: Refer to 

EM-118, "Cylinder head"

.

PBIC3219J

Standard

: Refer to 

EM-118, "Cylinder head"

.

SEM113