Nissan Murano: Engine Mechanical :: Removal and Installation / Exhaust Manifold and Three Way Catalyst

Exploded View

1.	Gasket	2.	Exhaust manifold (bank 1)	3.	Exhaust manifold cover (bank 1)
4.	Air fuel ratio sensor 1 (bank 1)	5.	Ring gasket	6.	Three way catalyst (bank 1)
7.	Three way catalyst support (bank 1)	8.	Heated oxygen sensor 2 (bank 1)	9.	Three way catalyst (bank 2)
10.	Three way catalyst support (bank 2)	11.	Heated oxygen sensor 2 (bank 2)	12.	Ring gasket
13.	Exhaust manifold (bank 2)	14.	Exhaust manifold cover (bank 2)	15.	Air fuel ratio sensor 1 (bank 2)
A.	To oil pan (upper). Refer to Exploded View.	B.	Upper mark		Engine front

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.

Remove the air cleaner case (upper), air cleaner case (lower), and air duct hose and resonator assembly. Refer to Removal and Installation.

Remove the battery and battery tray assembly. Refer to Removal and Installation.

Remove the front wheels and tires using power tool. Refer to Removal and Installation.

Remove the front under cover. Refer to Removal and Installation.

Remove the fender protector side covers (LH and RH). Refer to Exploded View.

Remove the radiator assembly. Refer to Removal and Installation.

Remove the engine cooling fan shroud and motor assembly. Refer to Removal and Installation.

Remove the front exhaust tube. Refer to Exploded View.

Support the engine with a suitable tool.

Remove the engine mount bracket (front). Refer to Exploded View (FWD) or Exploded View (AWD).

Remove the three way catalyst support (bank 2).

Remove heated oxygen sensor 2 (bank 2), air fuel ratio (A/F) sensor 1 (bank 2).Disconnect harness connector from each sensor, and remove the harness from the bracket and middle clamp. Remove both heated oxygen sensor and air fuel ratio (A/F) sensor using Tool.

CAUTION:

• Be careful not to damage heated oxygen sensors or air fuel ratio (A/F) sensors.

Remove exhaust manifold and three way catalyst heat shields with power tool.

Remove the three way catalyst (bank 2) by loosening the bolts first and then removing the nuts and through bolts.

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

: Engine front

NOTE:

Number 7 and 8 are not applicable to removal.

Remove the exhaust manifold (bank 2) and gasket.

INSPECTION AFTER REMOVAL

Surface Distortion

• Use suitable tools (A/B) to check the flatness of the exhaust manifold mating surfaces.

  

  Limit

  : 0.3 mm (0.012 in)

• Replace the exhaust manifold if the measurement exceeds specifications.

INSTALLATION

Installation is in the reverse order of removal.

Install the studs in the exhaust manifold (if removed), and tighten to specification.

Install the exhaust manifold gasket in the direction shown.

CAUTION:

Do not reuse exhaust manifold gasket.

(A)	: Bank 1
(B)	: Triangle press
(C)	: Bank 2
	: Engine front

Install the exhaust manifold (bank 2) nuts and tighten to specification in the order shown.

: Engine front

NOTE:

Number 7 and 8 are tightened a second time.

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)

• 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)

NOTE:

After installation, it is necessary to re-calibrate the electric throttle control actuator as follows:

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.

Remove the cowl top and the lower cowl top extension. Refer to Exploded View.

Remove the front wheel and tire (RH) (AWD models only) using a power tool. Refer to Removal and Installation.

Remove the front under cover. Refer to Removal and Installation.

Remove the fender protector side cover (RH) (AWD models only). Refer to Removal and Installation.

Remove transmission air breather hose. Refer to Exploded View.

Remove the front exhaust tube, hanger and heat insulator. Refer to Exploded View.

Remove the propeller shaft and propeller shaft center bearing (AWD models only). Refer to Removal and Installation.

Remove the RH front axle shaft (AWD models only). Refer to Removal and Installation (RH).

Remove the three way catalyst support (bank 1).

Remove heated oxygen sensor 2 (bank 1), air fuel ratio (A/F) sensor 1 (bank 1).disconnect harness connector from each sensor, and remove the harness from the bracket and middle clamp. Remove both heated oxygen sensors and air fuel ratio (A/F) sensors using Tool.

CAUTION:

• Be careful not to damage heated oxygen sensors or air fuel ratio (A/F) sensors.

Remove exhaust manifold and three way catalyst heat shields with power tool.

Remove the three way catalyst (bank 1) by loosening the bolts first and then removing the nuts and through bolts.

Loosen the exhaust manifold nuts in the reverse order as shown.

: Engine front

NOTE:

Number 7 and 8 are not applicable to removal.

Remove the exhaust manifold (bank 1) and gasket.

INSPECTION AFTER REMOVAL

Surface Distortion

• Use suitable tools (A/B) to check the flatness of the exhaust manifold mating surfaces.

  

  Limit

  : 0.3 mm (0.012 in)

• Replace the exhaust manifold if the measurement exceeds specifications.

INSTALLATION

Installation is in the reverse order of removal.

Install the studs in the exhaust manifold (if removed), and tighten to specification.

Install the exhaust manifold gasket in the direction shown.

CAUTION:

Do not reuse exhaust manifold gasket.

(A)	: Bank 1
(B)	: Triangle press
(C)	: Bank 2
	: Engine front

Install the exhaust manifold (bank 1) nuts and tighten to specification in the order shown.

: Engine front

NOTE:

Number 7 and 8 are tightened a second time.

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)

• 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)