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Nissan Versa Sedan. Instruction - part 386

CYLINDER HEAD

EM-79

< REMOVAL AND INSTALLATION >

[HR16DE]

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-75, "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. Refer to

MA-12, "Fluids and Lubricants"

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.

WARNING:

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

CAUTION:

Avoid directly touching cold valve seats.

(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

EM-80

< REMOVAL AND INSTALLATION >

[HR16DE]

CYLINDER HEAD

5. Using a suitable tool a valve seat grinder, finish valve seat to the

specified dimensions. For dimensions, refer to

MA-12, "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-12, "Fluids and Lubricants"

• Use procedure below to check for fuel leakage.

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

age at connection points.

• Start engine. With engine speed increased, check again for fuel leakage 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 is no leakage 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.

• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to spec-

ified level, if necessary.

• Summary of the inspection items:

SEM934C

(B)

: Contact

Limit

: Refer to

EM-120, "Cylinder head"

PBIC3219J

Standard

: Refer to

EM-120, "Cylinder head"

SEM113

CYLINDER HEAD

EM-81

< REMOVAL AND INSTALLATION >

[HR16DE]

*Power steering fluid, brake fluid, etc.

Item

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Transmission/
transaxle fluid

A/T and CVT Models

Leakage

Level/Leakage

Leakage

M/T Models

Level/Leakage

Leakage

Level/Leakage

Other oils and fluids*

Level

Leakage

Level

Fuel

Leakage

Exhaust gas

—

Leakage

—

EM-82

< UNIT REMOVAL AND INSTALLATION >

[HR16DE]

ENGINE ASSEMBLY

UNIT REMOVAL AND INSTALLATION

ENGINE ASSEMBLY

Exploded View

INFOID:0000000009266669

CAUTION:

Check that the stud bolt (*2) is tight at the specified torque before tightening the nut (*1) shown. [Stud

bolt (*2) may be loosened after loosening the nut (*1)]

Removal and Installation

INFOID:0000000009266670

WARNING:

• Position the vehicle on a flat and solid surface.

• Place chocks at front and back of rear wheels.

• Attach proper slingers and bolts described in PARTS CATALOG if engine is not already equipped.

CAUTION:

• Always be careful to work safely.

• Do not start working until exhaust system and coolant are cool enough.

• If items or work required are not covered by the engine section, refer to the applicable sections.

• Always use the support point specified for lifting.

Engine mounting (RH) stay

Engine mount (RH) stay

Engine mounting insulator (RH)

Rear engine mounting bracket

Rear torque rod

Engine mounting bracket (LH)

Engine mounting insulator (LH)

Mass damper

Front mark

Transaxle (upper)

Transaxle (lower)

M/T models

JSBIA1095GB

Content .. 384 385 386 387 ..