Infiniti G37 Coupe. Manual — part 614
INTAKE MANIFOLD
EM-31
< ON-VEHICLE REPAIR >
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INTAKE MANIFOLD
Exploded View
INFOID:0000000001547585
Removal and Installation
INFOID:0000000001547586
REMOVAL
1.
Release fuel pressure. Refer to
.
2.
Remove intake manifold collector. Refer to
3.
Remove fuel tube and fuel injector assembly. Refer to
.
4.
Loosen mounting bolts in reverse order as shown in the figure to
remove intake manifold with power tool.
CAUTION:
• Cover engine openings to avoid entry of foreign materi-
als.
• Put a mark on the intake manifold and the cylinder head
with paint before removal because they need to be
installed in the specified direction.
• Loosen mounting bolts from the inside of manifold to the
outside.
5.
Remove gaskets.
INSTALLATION
Note the following, and install in the reverse order of removal.
INTAKE MANIFOLD
• If stud bolts were removed, install them and tighten to the torque specified below.
1.
Intake manifold
2.
Gasket
A.
Refer to
JPBIA1350GB
: Engine front
JPBIA1352ZZ
: 10.8 N·m (1.1 kg-m, 8 ft-lb)
EM-32
< ON-VEHICLE REPAIR >
INTAKE MANIFOLD
• Tighten all mounting bolts to the specified torque in two or more
steps in numerical order as shown in the figure.
CAUTION:
• Install intake manifold with the marks (put on the intake
manifold and the cylinder head before removal) aligned.
• Tighten mounting bolts from the outside of manifold to the
inside.
Inspection
INFOID:0000000001547587
INSPECTION AFTER REMOVAL
Surface Distortion
• Check the surface distortion of the intake manifold mating surface
with a straightedge (A) and a feeler gauge (B).
• If it exceeds the limit, replace intake manifold.
: Engine front
1st step:
: 7.4 N·m (0.75 kg-m, 5 ft-lb)
2nd step and after:
: 25.5 N·m (2.6 kg-m, 19 ft-lb)
JPBIA1352ZZ
Limit
: Refer to
JPBIA1348ZZ
EXHAUST MANIFOLD
EM-33
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EXHAUST MANIFOLD
Exploded View
INFOID:0000000001547588
Removal and Installation
INFOID:0000000001547589
REMOVAL
WARNING:
Perform the work when the exhaust and cooling system have completely cooled down.
NOTE:
When removing bank 1 side parts only, steps 1, 4 and 7 are unnecessary.
1.
Drain engine coolant. Refer to
2.
Remove engine cover with power tool. Refer to
.
3.
Remove air cleaner case and air duct (RH and LH). Refer to
.
4.
Remove water pipe and water hose. Refer to
5.
Remove engine undercover with power tool.
6.
Remove exhaust front tube and three way catalysts (bank 1 and bank 2). Refer to
.
7.
Disconnect steering lower joint at power steering gear assembly side, and release steering lower shaft.
1.
Heated oxygen sensor (bank 1)
2.
Air fuel ratio sensor (bank 1)
3.
Exhaust manifold cover (upper)
4.
Exhaust manifold (bank 1)
5.
Exhaust manifold cover (lower)
6.
Gasket
7.
Ring gasket
8.
Three way catalyst (bank 1)
9.
Gasket
10. Heated oxygen sensor (bank 2)
11. Gasket
12.
Three way catalyst (bank 2)
13. Ring gasket
14. Exhaust manifold (bank 2)
15.
Exhaust manifold cover (lower)
16. Gasket
17. Air fuel ratio sensor (bank 2)
18.
Exhaust manifold cover (upper)
Refer to
for symbols in the figure.
JPBIA1355GB
EM-34
< ON-VEHICLE REPAIR >
EXHAUST MANIFOLD
8.
Disconnect air fuel ratio sensor (bank 1 and bank 2) harness connectors and remove harness clip.
9.
Using the heated oxygen sensor wrench [SST: KV10114400
(J38365)] (C), remove air fuel ratio sensor (bank 1 and bank 2).
CAUTION:
• Be careful not to damage air fuel ratio sensor.
• Discard any air fuel ratio sensor that has been dropped
onto a hard surface such as a concrete floor. Replace with
a new sensor.
10. Remove exhaust manifold cover (upper) (bank 1 and bank 2).
11. Loosen mounting nuts in the reverse order as shown in the fig-
ure to remove exhaust manifold.
NOTE:
Disregard the numerical order No. 7 and 8 in removal.
12. Remove gaskets.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
INSTALLATION
Note the following, and install in the reverse order of removal.
EXHAUST MANIFOLD GASKET
• Install exhaust manifold gasket in direction shown in the figure.
(Follow the same procedure for both banks.)
EXHAUST MANIFOLD
• If stud bolts were removed, install them and tighten to the torque specified below.
A
: Bank 2
B
: Bank 1
JPBIA0271ZZ
A
: Bank 1
B
: Bank 2
: Engine front
JPBIA0017ZZ
A
: Bank 1
B
: Triangle press
C
: Bank 2
: Engine front
JPBIA0019ZZ
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