Nissan Primera P11. Instruction — part 423
Assembly
1.
Install valve component parts.
Install valve spring with its narrow pitch side toward cylinder
head side.
I
Always install new valve oil seals.
Refer to oil seal replacement.
I
Before installing oil seal, install valve-spring seat.
I
When installing valve, apply engine oil on the valve stem
and lip of valve oil seal.
I
Check whether the valve face is free from foreign matter.
I
Install valve spring retainers on the intake side and valve
rotators on the exhaust side.
I
Valve rotators cannot be disassembled.
I
Install valve shims
I
Adjust valve clearance
2.
Install camshaft and brackets and tighten bracket nuts to the
specified torque in two or three stages.
Camshaft-bracket nuts:
: 18 - 22 N·m (1.8 - 2.2 kg-m, 13 - 16 ft-lb)
I
Tighten bracket from center to outside.
I
Apply sealant to brackets No. 1 and No. 5.
I
When installing brackets, set camshaft so that the pin of
camshaft front head is uppermost.
I
Install new camshaft oil seals.
Refer to oil seal replacement.
Installation
1.
Install cylinder head gasket.
I
When replacing only cylinder head gasket, install same
grade gasket as the one formerly used.
I
When replacing or repairing cylinder block, piston, con-
necting rod and crankshaft, select gasket referring to
“Selecting cylinder head gasket”.
I
Pay attention to the direction of the cylinder head bolt
washer as shown in the figure.
2.
Install cylinder head and tighten cylinder head bolts according
to the following sequence.
SEM202
Painted side
Cylinder
head side
Narrow
pitch
Wide pitch
SEM731BA
SEM528D
Grade number
Tightening sequence
Facing front of engine
(position 2)
SEM676D
17.5 (0.689)
13.0 (0.512)
No. 1 journal bracket
No. 5 journal bracket
Unit: mm (in)
SEM675D
Cylinder head
Cylinder head bolt
Washer
CYLINDER HEAD
CD20T
Assembly
EM-151
CAUTION:
The cylinder head bolts can be reused providing dimension
“A” is not exceeded.
Dimension “A”:
118.7 mm (4.6732 in)
NEM328
Cylinder head bolt
12 mm
“A”
CYLINDER HEAD
CD20T
Installation (Cont’d)
EM-152
Tightening procedure
I
Apply engine oil to threads and underhead seating face of
each bolt.
Tighten bolts in the numerical order shown in the figure and follow-
ing the steps below.
p
a
31 - 37 N·m (3.2 - 3.8 kg-m, 23 - 27 ft-lb)
p
b
Tighten to 180 - 190°
p
c
Completely loosen the bolts in reverse order
p
d
31 - 37 N·m (3.2 - 3.8 kg-m, 23 - 27 ft-lb)
p
e
Tighten to 90 - 95°
p
f
Tighten to 90 - 95°
3.
Install rocker cover.
I
Install rocker cover in the sequence shown at left.
I
Apply sealing compound (THREE-BOND No. 10 or equivalent)
to both ends of brackets No. 1 and No. 5.
SEM672D
Engine front
SEM848F
NEM211
Marking
SEM678D
SEM677D
Apply sealant.
CYLINDER HEAD
CD20T
Installation (Cont’d)
EM-153
Selecting cylinder head gasket
When replacing only cylinder head gasket, install the same
grade (Number of notches) gasket as the one formerly used.
Step 1
Measure projection of piston to cylinder head surface.
a)
Set dial gauge and needle on cylinder block and adjust dial
gauge to zero.
b)
Set dial gauge needle at measuring point on piston, taking care
not to disturb its zero setting.
c)
Rotate crankshaft around the top dead center position.
d)
Record the maximum value.
e)
Reset dial gauge on cylinder block and confirm that zero set-
ting has not been disturbed during measurement.
f)
Repeat steps b through d for all measuring points as illustrated
and for each cylinder.
I
Be sure that piston whose projection is being measured is at
its TDC.
Step 2
Calculate the average value of measurements taken for each pis-
ton.
Step 3
Calculate the average value of measurements for all pistons from
the values obtained from step 2.
Step 4
Round off the value obtained.
Step 5
Determine required thickness of gasket, referring to chart A.
Relation between piston average projection and cylinder head
gasket (Chart A)
Average value of
piston projections
mm (in)
Gasket thickness
mm (in)
Grade
(Number of
notches)
New parts
In assembly
Less than 0.505
(0.0199)
1.30 (0.0512)
1.15
±0.05
(0.0453
±0.0020
)
1
0.505 - 0.555
(0.0199 - 0.0219)
1.35 (0.0531)
1.20
±0.05
(0.0472
±0.0020
)
2
Over 0.555 (0.0219)
1.40 (0.0551)
1.25
±0.05
(0.0492
±0.0020
)
3
Step 6
Check if the average value of each projection obtained from step
2 is larger than the max. value of the standard projection (of
selected gasket) incremented by 0.05 mm (0.0020 in).
If so, use gasket that is 1 grade thicker. If not, use gasket as
selected in step 4.
SEM593A
SEM529D
30
(1.18)
30
(1.18)
Unit: mm (in)
25
(0.98)
25
(0.98)
SEM530D
Notch
CYLINDER HEAD
CD20T
Installation (Cont’d)
EM-154
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