Nissan Versa Sedan. Manual — part 385
CYLINDER HEAD
EM-75
< REMOVAL AND INSTALLATION >
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c. Turn all bolts 60 degrees clockwise (angle tightening) using Tool
(A) in the specified order.
CAUTION:
Check and confirm the tightening angle by using Tool (A) or
protractor. Avoid judgment by visual inspection without the
tool.
d. Completely loosen all bolts.
CAUTION:
In this step, loosen bolts in reverse order of that indicated as shown.
e. Tighten all bolts.
f.
Turn all bolts 75 degrees clockwise (angle tightening).
g. Turn all bolts 75 degrees clockwise again (angle tightening).
3. Installation of the remaining components is in the reverse order of removal.
Disassembly and Assembly
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DISASSEMBLY
1. Remove spark plug with a suitable tool.
2. Remove valve lifter.
• Identify installation positions, and store lifters without mixing them up.
3. Remove valve collet.
• Compress valve spring with Tool (A). Remove valve collet with
a magnet tool (B).
CAUTION:
Be careful not to damage valve lifter holes.
4. Remove valve spring retainer and valve spring.
5. Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store without mixing them up.
6. Remove valve oil seal using Tool (A).
Tool number
: KV10112100 (BT-8653-A)
PBIC3733E
Cylinder head bolts
: 0 N·m (0 kg-m, 0 ft-lb)
Cylinder head bolts
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
Tool number
: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
PBIC3727E
Tool number
: KV10107902 (J-38959)
PBIC3728E
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< REMOVAL AND INSTALLATION >
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CYLINDER HEAD
7. Remove valve spring seat.
8. When valve seat must be replaced, refer to
for removal.
9. When valve guide must be replaced, refer to
for removal.
ASSEMBLY
1. Install valve guide if removed. Refer to
2. Install valve seat if removed. Refer to
.
3. Install valve oil seal.
• Install with Tool (A) to match dimension as shown.
4. Install valve spring seat.
5. Install valve.
• Install larger diameter to intake side.
6. Install valve spring.
NOTE:
It can be installed in either direction.
7. Install valve spring retainer.
8. Install valve collet.
• Compress valve spring with Tool (A). Install valve collet with a
magnet hand (B).
CAUTION:
Be careful not to damage valve lifter holes.
• Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
9. Install valve lifter.
10. Install spark plug with a suitable tool.
Inspection
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INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
• 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.
Height “H”
: 13.2 - 13.8 mm (0.520 - 0.543 in)
Tool number
: KV10115600 (J-38958)
PBIC3211J
Tool number
: KV10116200 (J-26336-B)
: KV10115900 (J-26336-20)
: KV10109220 ( — )
PBIC3727E
Limit (“d1”–“d2”): 0.15 mm (0.0059 in)
PBIC3717E
CYLINDER HEAD
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Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to
.
1. Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a 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.
• If it exceeds the limit, replace cylinder head.
INSPECTION AFTER DISASSEMBLY
VALVE DIMENSIONS
• Check the dimensions of each valve. For the dimensions, refer to
.
• 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 with micrometer (A).
Valve Guide Inner Diameter
• Measure the inner diameter of valve guide with bore gauge.
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
.
VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
1. To remove valve guide, heat cylinder head to 110 to 130
°C (230
to 266
°F) by soaking in heated oil.
(A) : Straightedge
(B) : Feeler gauge
Limit
: Refer to
.
PBIC3207J
Standard
: Refer to
.
Standard
: Refer to
Standard and Limit
: Refer to
.
PBIC3213J
SEM008A
EM-78
< REMOVAL AND INSTALLATION >
[HR16DE]
CYLINDER HEAD
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
to dimensions as shown.
WARNING:
Cylinder head contains heat; when working, wear protective
equipment to avoid getting burned.
6. Apply reamer finish to valve guide with a suitable tool.
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
Standard
5.000 - 5.018 mm (0.1968 - 0.1975 in)
SEM932C
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