Nissan Note E12. Manual — part 270
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
.
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
.
• 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
.
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
.
PBIC3207J
Standard
: Refer to
.
Standard
: Refer to
Standard and Limit
: Refer to
PBIC3213J
CYLINDER HEAD
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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
.
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
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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
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
.
• 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
.
PBIC3219J
Standard
: Refer to
.
SEM113
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