Nissan Versa Sedan. Manual — part 386
CYLINDER HEAD
EM-79
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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
.
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
PBIC3219J
Standard
: Refer to
.
SEM113
CYLINDER HEAD
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*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
Leakage
Leakage
Exhaust gas
—
Leakage
—
EM-82
< UNIT REMOVAL AND INSTALLATION >
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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.
1.
Engine mounting (RH) stay
2.
Engine mount (RH) stay
3.
Engine mounting insulator (RH)
4.
Rear engine mounting bracket
5.
Rear torque rod
6.
Engine mounting bracket (LH)
7.
Engine mounting bracket (LH)
8.
Engine mounting insulator (LH)
9.
Mass damper
A.
Front mark
B.
Transaxle (upper)
C.
Transaxle (lower)
D.
M/T models
JSBIA1095GB
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