Nissan Sentra B18 (2020-2025) Service Manual: Exhaust Manifold

Exploded View

Exploded View

1.	Air fuel ratio (A/F) sensor 1	2.	Exhaust manifold cover	3.	Exhaust manifold gasket
4.	Exhaust manifold	5.	Exhaust manifold stay	A.	Refer to Removal and Installation.
B.	View B	C.	To exhaust front tube. Refer to Exploded View.

: Indicates that the part is connected at points with same symbol in actual Nissan Sentra vehicle.

Removal and Installation

Removal and Installation

REMOVAL

Remove the front suspension member. Refer to Removal and Installation.

Remove the EGR inlet tube heat shield. Refer to Exploded View.

Remove the bolts securing the EGR inlet tube to the exhaust manifold. Refer to Exploded View.

Remove exhaust front tube. Refer to Exploded View.

Disconnect the harness connector from the air fuel ratio (A/F) sensor 1.

Disengage the air fuel ratio (A/F) sensor 1 harness from the harness retainer on the exhaust manifold cover.

Unbolt and reposition vacuum delay valve bracket. Refer to Exploded View.

Remove exhaust manifold cover.

Remove exhaust manifold stay.

Loosen exhaust manifold nuts in reverse of the sequence shown and remove exhaust manifold.

CAUTION:

Do not reuse exhaust manifold nuts.

Remove exhaust manifold gasket.

CAUTION:

• Cover engine openings to avoid entry of foreign materials.

• Do not reuse exhaust manifold gasket.

Remove the air fuel ratio (A/F) sensor 1 using Tool (if necessary).

Tool number

: KV991J0050 (NI-44626)

CAUTION:

Handle air fuel ratio sensor 1 carefully and avoid impacts.

Remove exhaust manifold stud from cylinder head (if necessary).

CAUTION:

Do not reuse exhaust manifold stud.

INSTALLATION

Install exhaust manifold stud (if necessary).

CAUTION:

Do not reuse exhaust manifold stud.

Install exhaust manifold gasket to cylinder head.

CAUTION:

Do not reuse exhaust manifold gasket.

Install exhaust manifold and tighten exhaust manifold nuts to the specified torque in the sequence shown.

CAUTION:

Do not reuse exhaust manifold nuts.

Note:

Repeat tightening sequence to ensure exhaust manifold nuts are tightened to the specified torque.

Exhaust manifold nuts

: 33.4 N·m (3.4 kg-m, 25 ft-lb)

Installation of the remaining parts in the reverse order of removal.

CAUTION:

• Before installing the air fuel ratio (A/F) sensor 1, clean the exhaust manifold threads using oxygen sensor thread cleaner tool and apply anti-seize lubricant or equivalent.

  Oxygen sensor thread cleaner

  : — (NI-43897-18)

• Do not over-tighten the air fuel ratio (A/F) sensor 1. Doing so may cause damage, resulting in a malfunction and the MIL coming on.

  Tool number

  : KV991J0050 (NI-44626)

Inspection

Inspection

INSPECTION AFTER REMOVAL

Surface Distortion

• Using suitable tool (A) and suitable tool (B), check the surface distortion of exhaust manifold mating surface in each exhaust port and entire part.

  

  Limit

  : Refer to Exhaust Manifold.

• If it exceeds the limit, replace exhaust manifold.

INSPECTION AFTER INSTALLATION

Check the joint of parts with the engine in running state. Check that there is no leaks of exhaust gas and abnormal sound.