Nissan Almera Tino V10. Manual — part 884
EM-192
[YD]
CYLINDER HEAD
5.
Remove valve oil seals using valve oil seal puller.
6.
Remove valve spring seats.
7.
Before removing valve spring seats, perform valve seat contact
check. Refer to
.
8.
Before removing valve guides, perform valve guide clearance
check. Refer to
EM-193, "Valve Guide Clearance"
.
ASSEMBLY
1.
Install valve guides. Refer to
EM-193, "Valve Guide Replacement"
.
2.
Install valve seats. Refer to
EM-194, "Valve Seat Replacement"
.
3.
Using valve oil seal drift, install valve oil seals referring to the
dimension shown in the figure.
4.
Install valve spring seats.
5.
Install valves.
●
Install the valves with bigger outer diameter to intake valve
side.
●
Note that valve layout here is different from that of conven-
tional engine.
6.
Install valve spring.
7.
Install valve spring retainers.
8.
Using valve spring compressor, compress valve springs.
Then install valve collets using magnetic hand.
●
After installing valve collets, tap the stem end using a plastic hammer, and check the installation status.
9.
Install valve lifters and adjusting shims to the same positions as before.
INSPECTION AFTER DISASSEMBLY
Cylinder Head Distortion
Using straightedge and feeler gauge, check the bottom of the cylin-
der head for distortion.
JEM153G
JEM165G
Limit
: 0.04 mm (0.0016 in)
SEM496G
CYLINDER HEAD
EM-193
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Valve Dimension
Check dimensions of each valve. For dimensions, refer to SDS,
.
When valve head has been worn down to 1 mm (0.039 in) in margin
thickness, replace valve.
Grinding allowance for valve stem tip is 0.2 mm (0.008 in) or
less.
Valve Guide Clearance
●
Perform the inspection before removing valve guides.
●
Check that the valve stem diameter is within specifications.
●
Push valve approximately 25 mm (0.98 in) toward combustion
chamber, move valve toward dial indicator to measure valve
movement.
●
Valve guide clearance is 1/2 of movement on dial indicator.
●
If the measured value exceeds the limit, replace valve guide.
Valve Guide Replacement
●
When removing valve guide, replace it with oversized [0.2 mm
(0.0008 in)] valve guide.
1.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) in oil bath.
2.
Using valve guide drift, tap valve guides out from the combus-
tion chamber side.
SEM188A
Standard:
Intake
: 0.020 - 0.053 mm (0.0008 - 0.0021 in)
Exhaust
: 0.040 - 0.073 mm (0.0016 - 0.0029 in)
Limit:
Intake
: 0.08 mm (0.0031 in)
Exhaust
: 0.10 mm (0.0039 in)
PBIC0414E
SEM008A
SEM931C
EM-194
[YD]
CYLINDER HEAD
3.
Remove cylinder head valve guide hole.
4.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) in oil bath.
5.
Using valve guide drift, press fit valve guides from camshaft
side, referring to the dimension shown in the figure.
6.
Using valve guide reamer, perform reaming to the press-fitted
valve guides.
Valve Seat Contact
●
Before starting this check, confirm that the dimension of valve
guide and valves are as specified.
●
Apply red lead primer on contacting surfaces of valves seat and
of valve face to examine the conditions of contacting surfaces.
●
Check that the paint on contacting surfaces is continuous along
the entire circumference.
●
If there are abnormal indications, grind the valve and check the
contact again. If abnormal indications still persist, replace valve
seat.
Valve Seat Replacement
●
When removing valve seat, replace it with oversized [0.5 mm (0.020 in)] valve seat.
1.
Cut valve seat to make it thin, and pull it out.
Valve guide hole diameter (for service parts):
: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM932C
Projection “L”
: 10.4 - 10.6 mm (0.409 - 0.417 in)
JEM156G
Reaming specifications:
Intake and Exhaust
6.000 - 6.018 mm (0.2362 - 0.2369 in)
FEM072
SBIA0322E
CYLINDER HEAD
EM-195
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2.
Machine cylinder head inner diameter at valve seat installation
position.
3.
Heat cylinder head to approximately 110 to 130
°
C (230 to
266
°
F) in oil bath.
4.
After cooling valve seats sufficiently with dry ice, press fit it to cylinder head.
CAUTION:
Do not touch the cooled valve seats directly by hand.
5.
Using valve seat cutter, finish processing referring to the dimen-
sions shown in the figure.
CAUTION:
When using valve seat cutter, grasp cutter handle with both
hands, press cutter onto contacting face all around, and cut
thoroughly. If cutter is pressed unevenly or repeatedly, the
valve seat surface may be damaged.
6.
Using compound, perform valve fitting.
7.
Check again to make sure that contacting status is satisfactory.
For details, refer to
.
Machining dimension:
Intake
30.500 - 30.516 mm (1.2008 - 1.2014 in)
Exhaust
29.500 - 29.516 mm (1.1614 - 1.1620 in)
SEM795A
FEM075
MBIA0021E
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