Nissan Quest E52. Manual - part 571

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-33

< REMOVAL AND INSTALLATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

EXHAUST MANIFOLD AND THREE WAY CATALYST

Exploded View

INFOID:0000000009652768

Removal and Installation

INFOID:0000000009652769

REMOVAL

WARNING:

Perform the work when the exhaust and cooling system have completely cooled down.

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)

B.

Upper mark

 : Always replace after every disassembly.

 : N·m (kg-m, ft-lb)

 : N·m (kg-m, in-lb)

JPBIA4635GB

EM-34

< REMOVAL AND INSTALLATION >

[VQ35DE]

EXHAUST MANIFOLD AND THREE WAY CATALYST

Remove following parts

1.

Bank 1 side
• Air cleaner case (upper) with mass air flow sensor and air duct assembly: Refer to 

EM-26, "Exploded

View"

.

• Engine cover: Refer to 

EM-24, "Exploded View"

.

• Front wiper arm: Refer to 

WW-51, "WIPER ARM : Removal and Installation"

.

• Extension cowl top: Refer to 

EXT-21, "Exploded View"

.

• Heat insulator: Refar to 

ST-13, "Exploded View"

.

2.

Bank 2 side
• Engine under cover.

3.

Remove exhaust front tube. Refer to 

EX-5, "Exploded View"

.

4.

Disconnect harness connector and remove air fuel ratio sensor
1 on both banks with the heated oxygen sensor wrench [SST:
KV10117100 (J-3647-A)] (B).
• Put marks to identify installation positions of each air fuel ratio

sensor 1.

CAUTION:

• If air fuel ratio sensor is dropped on to a hard surfacelike

a concrete floor from a height of 0.5 m (19.69 in) or more,
discard the sensor and use a new one.

• Clean the mounting area of air fuel ratio sensor beforein-

stalling a new air fuel ratio sensor.

NOTE:
Figure is shown as an example of bank 2 (A).

5.

Disconnect harness connector and remove heated oxygen sen-
sor 2 on both banks with the heated oxygen sensor wrench
[SST: KV10114400 (J-38365)] (B).

• Put marks to identify installation positions of each heated oxy-

gen sensor 2.

CAUTION:

• If air fuel ratio sensor is dropped on to a hard surfacelike

a concrete floor from a height of 0.5 m (19.69 in) or more,
discard the sensor and use a new one.

• Clean the mounting area of air fuel ratio sensor beforeinstalling a new air fuel ratio sensor.

6.

Remove exhaust manifold covers (bank 1 and bank 2).

7.

Remove three way catalyst support mounting bolts (bank 1 and bank 2).

8.

Remove three way catalysts by loosening bolts first and then removing nuts. (Stud bolt and flange bolt
type)

CAUTION:

Handle carefully to avoid any shock to three way catalyst.

JPBIA1781ZZ

A

:  Bank  1

C

:  Bank  2

JPBIA2247ZZ

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-35

< REMOVAL AND INSTALLATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EM

N

P

O

9.

Loosen mounting nuts in the reverse order as shown in the fig-
ure to remove exhaust manifolds (bank 1 and bank 2).

NOTE:
Disregard No. 7 and 8 when loosing.

10. Remove gaskets.

CAUTION:

Cover engine openings to avoid entry of foreign materials.

INSTALLATION

Note the following, and install in the reverse order of removal.

Exhaust Manifold Gasket

Install in the direction indicated in the figure.

Exhaust Manifold

• If stud bolts were removed, install them and tighten to the torque specified below.

A

:  Bank  1

B

:  Bank  2

: Engine front

JPBIA1633ZZ

A

:  Bank  1

B

: Triangle press

C

:  Bank  2

: Engine front

PBIC4954E

: 15.4 N·m (1.6 kg-m, 11 ft-lb)

EM-36

< REMOVAL AND INSTALLATION >

[VQ35DE]

EXHAUST MANIFOLD AND THREE WAY CATALYST

• Tighten mounting nuts in numerical order as shown in the figure.

NOTE:
No. 7 and 8 mean double tightening of nuts No. 1 and 2.

Three Way Catalyst (bank 2)

1.

Temporarily tighten upper side bolts (B) and lower side bolt (A)
shown in the figure.

2.

Tighten the upper side bolts (B) shown in the figure. (specified
torque)

3.

Tighten all the lower side bolts [the other four except (B)]. (spec-
ified torque)

Three Way Catalyst Supports

1.

Temporarily tighten three way catalyst support mounting bolts.

2.

Tighten three way catalyst support mounting bolts to oil pan (upper).

3.

Tighten three way catalyst support mounting bolts to three way catalyst.

Air Fuel Ratio Sensor 1 and Heated Oxygen Sensor 2

• Install air fuel ratio sensor 1 and heated oxygen sensor 2 in the original position.
• Install referring the following if the installation positions cannot be

identified.

CAUTION:

• Before installing a new air fuel ratio sensor and a new heated

oxygen sensor, clean exhaust system threads using oxygen
sensor thread cleaner (commercial service tool: J-43897-18 or
J-43897-12) and apply anti-seize lubricant (commercial ser-
vice tool).

• Never over torque air fuel ratio sensor and heated oxygen sensor. Doing so may cause damage to air

fuel ratio sensor and heated oxygen sensor, resulting in “MIL” coming on.

A

:  Bank  1

B

:  Bank  2

: Engine front

JPBIA1633ZZ

: Engine front

JPBIA2709ZZ

Glass tube color

Air fuel ratio sensor 1

: Black

Heated oxygen sensor 2

: White

PBIC2652E