Exhaust Manifold Removal and Installation

Exhaust Manifold: Removal and Installation [VQ40DE]

Removal (LH)

WARNING:

Perform the work when the exhaust and cooling system have cooled sufficiently.

NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.

1) Remove engine room cover. Refer to [Engine Room Cover: Removal and Installation] Service and Repair.
2) Remove air cleaner case (upper) and air duct and resonator assembly. Refer to [Air Cleaner and Air Duct: Removal and Installation] Removal and Installation.
3) Remove engine under cover (if equipped). Refer to [Front Bumper: Removal and Installation] Service and Repair.
4) Partially drain engine coolant. Refer to [Changing Engine Coolant] Service and Repair.
5) Remove three way catalyst (LH). Refer to [Three Way Catalyst: Removal and Installation [VQ40DE] Catalytic Converter Removal and Installation ].
6) Remove oil level gauge and oil level gauge guide. Refer to [Oil Pan and Oil Strainer: Exploded View] Oil Pan and Oil Strainer Exploded View.
7) Disconnect water hoses at heater pipe. Refer to [Water Outlet and Water Piping: Exploded View] Water Outlet Exploded View.
8) Remove heater pipe from cylinder head (LH). Refer to [Water Outlet and Water Piping: Exploded View] Water Outlet Exploded View.
9) Loosen nuts in reverse order as shown.





- : Front

NOTE:
Disregard the numerical order No. 7 and 8 in removal.

10) Remove exhaust manifold (LH).
11) Remove gaskets.

CAUTION:
Cover engine openings to avoid entry of foreign materials.

Inspection after Removal

Surface Distortion

- Check the surface distortion of the exhaust manifold mating surface with straightedge and feeler gauge.











- If it exceeds the limit, replace exhaust manifold.

Installation (LH)

Installation is in the reverse order of removal.

Exhaust Manifold Gasket

Install the exhaust manifold gasket in direction as shown.





- : Front
- A: Identification hole

Exhaust Manifold

- If exhaust manifold studs were removed, install them and tighten to specification.
- Install exhaust manifold and tighten nuts in numerical order as shown.






CAUTION:
Use new exhaust manifold nuts for installation.

NOTE:
Tighten nuts No. 1 and 2 in two steps. The numerical order No. 7 and 8 show second step.

- : Front

Removal (RH)

1) Remove three way catalyst (RH). Refer to [Three Way Catalyst: Removal and Installation [VQ40DE] Catalytic Converter Removal and Installation ].
2) Remove heat shield from lower dash panel.
3) Remove support bolts from A/T fluid charging pipe (A/T models). Refer to [Transmission Assembly: Component] Component.
4) Loosen nuts in reverse order as shown.





- : Front

NOTE:
Disregard the numerical order No. 7 and 8 in removal.

5) Remove exhaust manifold (RH) and exhaust manifold cover (RH) together.
6) Remove gaskets.

CAUTION:
Cover engine openings to avoid entry of foreign materials.

Inspection after Removal

Surface Distortion

- Check the surface distortion of the exhaust manifold mating surface with straightedge and feeler gauge.











- If it exceeds the limit, replace exhaust manifold.

Installation (RH)

Installation is in the reverse order of removal.

NOTE:

If necessary, a crowfoot may be used to tighten the exhaust manifold nuts.

Exhaust Manifold Gasket

Install the exhaust manifold gaskets in direction as shown.





- : Front
- A: Identification hole

Exhaust Manifold

- If exhaust manifold studs were removed, install them and tighten to specification.
- Install exhaust manifold and tighten nuts in numerical order as shown.






CAUTION:
Use new exhaust manifold nuts for installation.

NOTE:
Tighten nuts No. 1 and 2 in two steps. The numerical order No. 7 and 8 show second step.

- : Front