Infiniti M45 (Y34). Manual — part 521
INTAKE MANIFOLD
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–
Apply fuel pressure to fuel lines with turning ignition switch ON (with engine stopped). Then check for
fuel leaks at connections.
–
Start the 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,
EM-22
EXHAUST MANIFOLD AND THREE WAY CATALYST
EXHAUST MANIFOLD AND THREE WAY CATALYST
PFP:14004
Removal and Installation
ABS000LN
REMOVAL
1.
Remove heated oxygen sensors as follows:
a.
Remove engine cover with power tool. Refer to
b.
Remove engine undercover with power tool.
c.
Remove harness connector of each heated oxygen sensor, and harness from bracket and middle clamp.
d.
Using the heated oxygen sensor wrench (SST), remove both left
and right heated oxygen sensors.
CAUTION:
●
Be careful not to damage heated oxygen sensor.
●
Discard any heated oxygen sensor which has been
dropped from a height of more than 0.5 m (19.7 in) 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 following steps.
a.
Remove A/C compressor with power tool and put it a side with
piping connected. Refer to
.
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
.
1.
Heated oxygen 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.
Heated oxygen sensor 1 (bank1)
PBIC3108E
PBIC1000E
EXHAUST MANIFOLD AND THREE WAY CATALYST
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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 reverse order of illustration to remove exhaust
manifold and three way catalyst (left bank) with power tool.
NOTE:
Exclude No. 9 to No. 12 in removal.
3.
Remove exhaust manifold and three way catalyst (right bank)
using the following steps.
a.
Remove battery and tray. Refer to
b.
Remove radiator reservoir tank and bracket. Refer to
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 with power tool. Refer to
SC-15, "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 reverse order of illustration to remove exhaust manifold and three way catalyst (right bank)
with power tool.
NOTE:
Exclude No. 9 to No. 12 in removal.
INSPECTION AFTER REMOVAL
Surface Distortion
●
Use a reliable straightedge and feeler gauge to check the flat-
ness of exhaust manifold fitting surface.
●
If it exceeds the limit, replace exhaust manifold and three way
catalyst.
PBIC0022E
Limit
: 0.3 mm (0.012 in)
PBIC0023E
EM-24
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 illustration of components
on former page. Refer to
EM-22, "Removal and Installation"
Tightening Exhaust Manifold Nuts
●
Install exhaust manifold and three way catalyst in numerical
order shown in the figure.
●
Tighten nuts No. 1 to No. 4 in two steps. Order No. 9 to 12
shows second step.
Installation of Heated Oxygen Sensor
CAUTION:
●
Before installing a new heated oxygen sensor, clean exhaust system threads using the oxygen
sensor thread cleaner, (commercial service tool: J-43897-18 or J-43897-12), and apply anti-seize
lubricant (commercial service tool).
●
Do not over torque the heated oxygen sensor. Doing so may cause damage to the heated oxygen
sensor, resulting in the “MIL” coming on.
PBIC0022E
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