Nissan Sentra Service Manual: Exhaust manifold

Exploded View

CALIFORNIA

1. Air fuel ratio sensor
2. Exhaust manifold heat shield (upper)
3. Exhaust manifold and three way catalyst
4. Exhaust manifold heat shield (rear)
5. Exhaust manifold heat shield (front)
6. Exhaust manifold gasket
7. Cylinder head

EXCEPT CALIFORNIA

1. Air fuel ratio sensor
2. Bracket
3. Exhaust manifold
4. Exhaust manifold gasket
5. Cylinder head
6. Exhaust manifold heat shield

Removal and Installation

REMOVAL

1. Remove the cowl top. Refer to EXT-25, "Exploded View".
2. Remove front exhaust tube. Refer to EX-5, "Exploded View".
3. Disconnect air fuel ratio sensor harness connector and remove air fuel ratio sensor if necessary.
4. Remove exhaust manifold cover.
5. Remove exhaust manifold.

• Loosen nuts in reverse order as shown.

NOTE:

Disregard the numerical order No. 6-8 in removal.

6. Remove exhaust manifold gasket.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

1. Install exhaust manifold gasket (1) to cylinder head as shown.

CAUTION:

Do not reuse exhaust manifold gasket (1).

2. Install exhaust manifold with the following procedure:

1. Tighten nuts in numerical order as shown.

NOTE:

• Tighten nuts the No.1-3 in two steps.
• The numerical order No.6-8 shows the second step.

3. Installation of remaining components is in the reverse order of removal.

Inspection

INSPECTION AFTER REMOVAL

Surface Distortion

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

Limit : Refer to EM-119, "Exhaust Manifold".

• If it exceeds the limit, replace exhaust manifold.