Nissan X-Trail 32. Manual — part 1049
CYLINDER HEAD
EM-93
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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Removal and Installation
INFOID:0000000010783726
REMOVAL
1.
Release fuel pressure. Refer to
2.
Drain engine coolant and engine oil. Refer to
3.
Remove the following components and related parts.
• Intake manifold: Refer to
• Exhaust manifold: Refer to
• High pressure fuel pump: Refer to
.
• Fuel tube and fuel injector assembly: Refer to
• Water outlet: Refer to
.
• Rocker cover: Refer to
• Front cover, timing chain: Refer to
.
Valve collet
Valve spring retainer
Valve spring
(with valve spring seat) (EXH)
Valve oil seal
Valve guide (EXH)
Valve seat (EXH)
Valve (EXH)
Valve (INT)
Valve seat (INT)
Cylinder head
Valve guide (INT)
Spark plug
Valve spring
(with valve spring seat) (INT)
Comply with the installation procedure
when tightening. Refer to
: Always replace after every disassembly.
: N·m (kg-m, ft-lb)
: Should be lubricated with oil.
JPBIA1753GB
EM-94
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
• Camshaft: Refer to
.
4.
Remove cylinder head.
• Loosen cylinder head bolts in the order from 10 to 1 as shown
in the figure.
• Using TORX socket (size: E18), loosen cylinder head bolts.
5.
Remove cylinder head gasket.
INSTALLATION
1.
Install cylinder head gasket.
2.
Install cylinder head, and tighten cylinder head bolts in the order
from 1 to 10 as shown in the figure with the following procedure.
CAUTION:
If cylinder head bolts are reused, check their outer diame-
ters before installation. Refer to
a.
Apply new engine oil to threads and seating surface of mounting
bolts.
b.
Tighten all cylinder head bolts.
c.
Turn all cylinder head bolts 100 degrees clockwise (angle tightening).
CAUTION:
Check and confirm the tightening angle by using an angle
wrench [SST: KV10112100]
or protractor. Never judge by
visual inspection without the tool.
d.
Completely loosen.
CAUTION:
In this step, loosen cylinder head bolts in reverse order that
indicated in the figure.
e.
Tighten all cylinder head bolts.
f.
Turn all cylinder head bolts 95 degrees clockwise (angle tightening).
g.
Turn all cylinder head bolts 95 degrees clockwise again (angle tightening).
3.
Install in the reverse order of removal, for the rest of parts.
Disassembly and Assembly
INFOID:0000000010783727
DISASSEMBLY
1.
Remove spark plug with spark plug wrench (commercial service tool).
2.
Remove valve lifter.
• Identify installation positions, and store them without mixing them up.
: Engine front
PBIC3206J
: Engine front
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
: 0 N·m (0 kg-m, 0 ft-lb)
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
PBIC3206J
PBIC3208J
CYLINDER HEAD
EM-95
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
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3.
Remove valve collet.
• Compress valve spring with the valve spring compressor [SST:
KV10116200] (A), the attachment [SST: KV10115900] (C), and
the adapter [SST: KV10109220] (B). Remove valve collet with
a magnet hand.
CAUTION:
• Be careful not to damage valve lifter holes.
• Fit the attachment [SST: KV10115900 (J-26336-20)]
in
thecenter of valve spring retainer
to press it.
4.
Remove valve spring retainer and valve spring (with valve spring seat).
CAUTION:
Never remove valve spring seat from valve spring.
5.
Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.
6.
Remove valve oil seal with a valve oil seal puller [SST:
KV10107902] .
7.
When valve seat must be replaced.
• 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. Refer to
.
CAUTION:
Never bore excessively to prevent cylinder head from scratching.
8.
When valve guide must be replaced.
JPBIA0180ZZ
JPBIA4477ZZ
PBIC3210J
EM-96
< UNIT DISASSEMBLY AND ASSEMBLY >
[MR20DD]
CYLINDER HEAD
a.
To remove valve guide, heat cylinder head to 110 to 130
°
C (230
to 266
°
F) by soaking in heated oil
.
b.
Drive out valve guide with a hammer and valve guide drift (com-
mercial service tool) (A).
CAUTION:
Cylinder head contains heat, wear protective equipment to
avoid getting burned.
ASSEMBLY
1.
When valve guide is removed, install it.
CAUTION:
Replace with oversize [0.2 mm (0.008 in)] valve guide.
a.
Ream cylinder head valve guide hole with a valve guide reamer
(commercial service tool) (A).
b.
Heat cylinder head to 110 to 130
°
C (230 to 266
°
F) by soaking in
heated oil
.
PBIC3214J
JSBIA2470ZZ
For service parts: Oversize [0.2 mm (0.008 in)]
.
JPBIA0185ZZ
PBIC3214J
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