Infiniti Q45. Manual — part 551
INTAKE MANIFOLD
EM-21
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12. Loosen bolts in the reverse order of figure to remove intake
manifold (lower) with power tool.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
13. Remove intake manifold gaskets.
CAUTION:
Cover engine openings to avoid entry of foreign materials.
14. Remove EVAP canister purge volume control solenoid from intake manifold (upper), if necessary.
15. Remove VIAS control solenoid valve from water gallery, if necessary.
16. Remove vacuum tank from intake manifold (lower), if necessary.
INSPECTION AFTER REMOVAL
Surface Distortion
●
Using a straightedge and a feeler gauge, inspect surface distor-
tion of intake manifold (upper and lower).
●
If it exceeds the limit, replace intake manifold (lower) and/or
intake manifold (upper).
INSTALLATION
Note the following, and install in the reverse order of removal.
Intake Manifold (Lower)
Tighten in numerical order as shown in the figure.
NOTE:
No. 7 and 8 have longer bolt length than others.
PBIC0015E
Limit
: 0.1 mm (0.004 in)
PBIC0016E
PBIC0015E
EM-22
INTAKE MANIFOLD
Intake Manifold (Upper )
Tighten in numerical order as shown in the figure.
NOTE:
No. 4 to 7 have longer bolt length than others.
Electric Throttle Control Actuator
●
Install intake manifold adapter gasket and electric throttle control actuator gasket so that three protrusions
for installation identification do not face downward.
●
Tighten mounting bolts of electric throttle control actuator equally and diagonally in several steps.
●
After installation perform procedure in
EM-22, "INSPECTION AFTER INSTALLATION"
Water Hose
Install water hose so that its overlap width for connection is between 27 mm (1.06 in) and 32 mm (1.26 in) (tar-
get: 27 mm, 1.06 in).
Vacuum Hose
Refer to
INSPECTION AFTER INSTALLATION
●
After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps.
–
Apply fuel pressure to fuel lines with turning ignition switch ON (with engine stopped). Then check for
fuel leaks at connections.
–
Start engine and rev it up and check for fuel leaks at connections.
●
Perform procedures for “Throttle Valve Closed Position Learning” after finishing repairs. Refer to
"Throttle Valve Closed Position Learning"
●
If electric throttle control actuator is replaced, perform procedures for “Idle Air Volume Learning” after fin-
ishing repairs. Refer to
EC-78, "Idle Air Volume Learning"
.
PBIC0014E
EXHAUST MANIFOLD AND THREE WAY CATALYST
EM-23
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EXHAUST MANIFOLD AND THREE WAY CATALYST
PFP:14004
Removal and Installation
NBS001OL
REMOVAL
1.
Remove Air fuel ratio sensors.
●
Put marks to identify installation positions of each air fuel ratio sensor 1.
a.
Remove engine cover, air duct (inlet), battery cover and air cleaner cover. Refer to
b.
Remove engine undercover (with power tool).
c.
Disconnect harness connector of each air fuel ratio sensor 1, and harness from bracket and middle clamp.
d.
Using the heated oxygen sensor wrench (SST), remove air fuel
ratio sensor 1 (bank1 and bank2).
CAUTION:
●
Be careful not to damage air fuel ratio sensor.
●
Discard any heated oxygen sensor which has been
dropped onto a hard surface such as a concrete floor;
use a new one.
2.
Remove exhaust manifold and three way catalyst (left bank) using the steps below.
1.
Air fuel ratio sensor 1 (bank 2)
2.
Exhaust manifold cover (right bank)
3.
Exhaust manifold and three way cat-
alyst (right bank)
4.
Gasket
5.
Exhaust manifold and three way cat-
alyst (left bank)
6.
Exhaust manifold cover (left bank)
7.
Air fuel ratio sensor 1 (bank 1)
PBIC3108E
PBIC1000E
EM-24
EXHAUST MANIFOLD AND THREE WAY CATALYST
a.
Remove A/C compressor with power tool and put aside with piping connected. Refer to
"Removal and Installation of Compressor"
b.
Remove exhaust front tube with power tool. Refer to
EX-3, "Removal and Installation"
c.
Remove steering lower joint to enable steering shaft to move freely. Refer to
d.
Support and lift up bottom of engine with transmission jack. Remove left engine mounting insulator along
with left engine mounting brackets.
e.
Remove exhaust manifold cover (left bank).
f.
Loosen nuts in the reverse order of figure to remove exhaust
manifold and three way catalyst (left bank) with power tool.
NOTE:
Disregard No. 9 to No. 12 when loosening.
3.
Remove exhaust manifold and three way catalyst (right bank)
using the steps below.
a.
Remove drive belt. Refer to
b.
Remove alternator. Refer to
SC-25, "Removal and Installation"
.
c.
Remove exhaust front tube with power tool. Refer to
.
d.
Remove nuts on bottom of right engine mounting insulator, and
lift up right side of engine approximately 3 cm (1.18 in) with transmission jack.
e.
Remove starter motor. Refer to
SC-14, "Removal and Installation"
f.
Support and lift up bottom of engine with transmission jack. Remove right engine mounting insulator along
with right engine mounting brackets.
g.
Remove exhaust manifold cover (right bank).
h.
Loosen nuts in the reverse order of figure to remove exhaust manifold and three way catalyst (right bank)
with power tool.
NOTE:
Disregard No. 9 to No. 12 when loosening.
INSPECTION AFTER REMOVAL
Surface Distortion
●
Use a straightedge and a feeler gauge to check the surface dis-
tortion of each exhaust manifold and three way catalyst flange
surface.
●
If it exceeds the limit, replace exhaust manifold and three way
catalyst.
INSTALLATION
Note the following, and install in the reverse order of removal.
Exhaust Manifold Gasket
Install exhaust manifold gasket with its directional protrusion set upward. Refer to
PBIC0022E
Limit
: 0.3mm (0.012in)
PBIC0023E
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