Nissan Terrano r20e. Manual — part 291
Unit: mm (in)
Grade
Piston crown
depression
Gasket thick-
ness*1
No. of notches
1
Less than −0.078
(−0.0031)*2
0.65 (0.0256)
1
2
More than −0.078
(−0.0031)*3
0.70 (0.0276)
2
*1: Thickness of gasket tightened with head bolts
*2: Indicates values such as −0.080 mm (−0.0031 in).
*3: Indicates values such as −0.075 mm (−0.0030 in).
2. Install idler gear and idler shaft.
I
Check that the counter marks with cam gear, “AA” and “BB”, are
located on the front side of the engine.
Refer to EM-52.
CAUTION:
Since idler gear cannot be installed or removed with cylinder
head assembly mounted on the engine because of interfer-
ence with gear case, make sure that there are no reverse
installations or uninstalled parts.
3. Install cylinder head assembly.
1) Attach gasket onto the rear of gear case.
2) Install O-ring to the rear of gear case.
3) Align cylinder head assembly with dowel pin of cylinder block
and install.
CAUTION:
I
Make sure the O-ring does not fall off. Be careful not to
drop the O-ring.
I
Do not damage gasket located at the front.
4. Position cylinder head assembly close to the rear of the gear
case.
1) Install cylinder head bolts to the front and rear of cylinder head
respectively, and tighten to the specified torque.
: 40 - 49 N
⋅
m (4.0 - 5.0 kg-m, 29 - 36 ft-lb)
2) Loosen cylinder head bolts completely.
3) Install gear case mounting bolts to 2 positions shown by arrows
in the figure, and tighten to the specified torque.
: Less than 9.8 N
⋅
m (1.0 kg-m, 87 in-lb)
5. Tighten cylinder head bolts in the order indicated in the figure.
1) Apply engine oil to installation bolt threads and washers.
2) Tighten bolts to 98 to 102 N
⋅
m (10.0 to 10.5 kg-m, 73 to 75 ft-
lb).
3) Loosen bolts completely until the torque becomes 0 N
⋅
m (0
kg-m, 0 in-lb).
CAUTION:
For procedure 3), loosen bolts in the reverse order as indi-
cated in the figure.
4) Tighten bolts to 40 to 44 N
⋅
m (4.0 to 4.5 kg-m, 29 to 32 ft-lb).
5) Tighten bolts at the angle of 90 to 95° (target is 95°). (Angle
tightening)
FEM061
FEM062
FEM055
CYLINDER HEAD
ZD
Installation (Cont’d)
EM-55
6) Once again, tighten bolts at the angle of 90 to 95° (target is
95°). (Angle tightening)
CAUTION:
Perform the following procedure to check turning angle of
angle tightening, and do not judge by visual check.
ANGLE TIGHTENING PROCEDURE
With protractor
I
Make counter marks on the bolt head of cylinder head and cyl-
inder head surface with paint, and check the turning angle.
With angle wrench (SST)
I
Check the turning angle using angle indicator of angle wrench.
6. Loosen gear case mounting bolts which were tightened in 3) of
procedure 4, retighten them to the specified torque.
7. Install glow plug.
I
2 different types (manufacturers) of glow plugs are provided in
parallel. (Refer to the figure for identification.)
I
Do not install 2 different types of glow plugs in the engine. Make
sure that the same glow plugs are installed.
I
Using reamer, remove the carbon adhering to the installation
hole of glow plug, and install glow plug.
FEM063
FEM064
CYLINDER HEAD
ZD
Installation (Cont’d)
EM-56
8. Install oil return pipe to the rear side of the cylinder head.
I
When reinstalling a stud bolt, apply Three Bond 1207C (KP510
00150) to the thread of the bolt.
Disassembly
1. Remove adjusting shims and valve lifters.
Check the installation positions, and keep them to avoid being
confused.
2. Using valve spring compressor (SST), compress valve spring.
Using magnetic hand, remove valve collets.
3. Remove valve spring retainers and valve springs.
4. Remove valves as pressing valve stems toward combustion
chamber.
I
Before removing the valve, check the valve guide clearance.
(Refer to EM-58.)
I
Check installation positions, and keep them to avoid being con-
fused.
I
Refer to the figure for intake/exhaust valve positions. (Intake
and exhaust valve driving cams are provided alternately for
each camshaft.)
FEM081
SEM361G
FEM010
CYLINDER HEAD
ZD
Installation (Cont’d)
EM-57
5. Remove valve oil seals using valve oil seal puller (SST).
6. Remove valve spring seats.
7. Before removing valve spring seats, perform valve seat contact
check. (Refer to EM-60.)
8. Before removing valve guides, perform valve guide clearance
check. (Refer to below.)
Inspection
CYLINDER HEAD DISTORTION
Using straightedge and feeler gauge, check the bottom of the cyl-
inder head for distortion.
Limit: 0.2 mm (0.008 in)
VALVE DIMENSION
Using micrometer, measure the dimensions of each part.
Standard
Unit: mm (in)
Intake valve
Exhaust valve
L
113.5 (4.4685)
113.5 (4.4685)
T
1.5 (0.0591)
1.5 (0.0591)
φ
d
6.962 - 6.977
(0.2741 - 0.2747)
6.945 - 6.960
(0.2734 - 0.2740)
φ
D
31.9 - 32.1
(1.2559 - 1.2638)
29.9 - 30.1
(1.1772 - 1.1850)
α
(degree)
45°00
′
- 45°30
′
45°00
′
- 45°30
′
VALVE GUIDE CLEARANCE
I
Perform the inspection before removing valve guides.
I
Check that the valve stem diameter is within specifications.
I
Push valve approximately 25 mm (0.98 in) toward combustion
chamber, move valve toward dial indicator to measure valve
movement.
I
Valve guide clearance is 1/2 of movement on dial indicator.
FEM065
FEM066
FEM067
FEM068
CYLINDER HEAD
ZD
Disassembly (Cont’d)
EM-58
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