Removal and Installation (LH)

EXHAUST MANIFOLD AND THREE WAY CATALYST

Removal and Installation (LH)


REMOVAL


WARNING:
- Perform the work when the exhaust system has completely cooled down.
- When removing the front and rear engine mounting through bolts and nuts, lift the engine up slightly for safety.
NOTE:
When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.
Revision: March 20122013 Infiniti JX
1.Remove the air cleaner case (upper), air cleaner case (lower), and air duct hose and resonator assembly.
Refer to "Removal and Installation" Removal and Installation.
2.Remove the battery and battery tray assembly. Refer to "Removal and Installation" Service and Repair.
3.Remove the front wheels and tires. Refer to "Adjustment" Service and Repair.
4.Remove the engine under cover. Refer to "Exploded View" Exploded View.
5.Remove the fender protector side covers (LH and RH). Refer to "Exploded View" Exploded View.
6.Remove the radiator assembly. Refer to "Removal and Installation" Removal and Installation.
7.Remove the engine cooling fan shroud and motor assembly. Refer to "Removal and Installation" Removal and Installation.
8.Remove the front exhaust tube. Refer to "Exploded View" Exploded View.
9.Support the engine with a suitable tool.
10.Remove the engine mount bracket (front). Refer to "2WD : Exploded View" Exploded View (2WD) or "AWD : Exploded View" Exploded View (AWD).
11.Remove the LH three way catalyst support brackets.
12.Remove heated oxygen sensor 2 (bank 2), air fuel ratio (A/F) sensor 1 (bank 2).
a.Remove harness connector of each sensor, and disconnect the harness from the bracket and middle clamp.
b.Remove both heated oxygen sensor and air fuel ratio (A/F) sensor using Tool.
Tool numbers: KV10114400 (J-38365)
: KV991J0050 (J-44626)

CAUTION:
- Be careful not to damage heated oxygen sensors or air fuel ratio (A/F) sensors.
- 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; replace with a new sensor.
13.Remove exhaust manifold and three way catalyst heat shields with power tool.
14.Remove the three way catalyst (bank 2) by loosening the bolts first and then removing the nuts and through bolts.





15.Loosen and remove the exhaust manifold nuts in the reverse order as shown.





16.Remove the exhaust manifold (LH) and gasket.





INSPECTION AFTER REMOVAL

Surface Distortion





- Use a reliable straightedge and feeler gauge to check the flatness of the exhaust manifold mating surfaces.





- Replace the exhaust manifold if the measurement exceeds specifications.

INSTALLATION

Installation is in the reverse order of removal.
Revision: March 20122013 Infiniti JX
1.Install the studs in the exhaust manifold (if removed), and tighten to specification.










2.Install the exhaust manifold gasket in the direction shown.










3.Install the exhaust manifold (LH) nuts and tighten to specification in the order shown.





CAUTION:
- Before installing a heated oxygen sensor or air fuel ratio (A/F) sensor, clean the exhaust manifold threads using the oxygen sensor thread cleaner tool and apply anti-seize lubricant.


Oxygen sensor thread cleaner: (J-43897-18)
Oxygen sensor thread cleaner: (J-43897-12)
- Do not over-tighten the air fuel ratio (A/F) sensor or heated oxygen sensors. Doing so may cause damage.
Tool numbers: KV10114400 (J-38365)
: KV991J0050 (J-44626)