Nissan Pathfinder. Manual - part 548

 

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Nissan Pathfinder. Manual - part 548

 

 

EXHAUST MANIFOLD AND THREE WAY CATALYST

EM-31

< REMOVAL AND INSTALLATION >

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EXHAUST MANIFOLD AND THREE WAY CATALYST

Exploded View

INFOID:0000000009177904

Removal and Installation (bank 2)

INFOID:0000000009177905

REMOVAL

WARNING:

• Perform the work when the exhaust system has completely cooled down.

• When removing the front and rear engine mount 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 spill-

ing.

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

AWBIA1356ZZ

EM-32

< REMOVAL AND INSTALLATION >

EXHAUST MANIFOLD AND THREE WAY CATALYST

1. Remove the air cleaner case (upper), air cleaner case (lower), and air duct hose and resonator assembly.

Refer to 

EM-24, "Removal and Installation"

.

2. Remove the battery and battery tray assembly. Refer to 

PG-92, "Removal and Installation"

.

3. Remove transaxle breather tube. Refer to 

TM-196, "Removal and Installation"

.

4. Remove the front wheels and tires using a power tool. Refer to 

WT-58, "Adjustment"

.

5. Remove the engine under cover. Refer to 

EXT-16, "Exploded View"

.

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

EXT-16, "Exploded View"

. 

7. Remove the fan shroud and motor assembly. Refer to 

CO-17, "Removal and Installation"

.

8. Remove the radiator assembly. Refer to 

CO-15, "Removal and Installation"

.

9. Remove the front exhaust tube. Refer to 

EX-5, "Exploded View"

.

10. Support the engine with a suitable tool.
11. Remove the engine mount bracket (front). Refer to 

EM-102, "2WD : Exploded View"

 (2WD) or 

EM-106,

"4WD : Exploded View"

 (4WD).

12. Remove the three way catalyst support (bank 2).
13. Remove heated oxygen sensor 2 (bank 2), air fuel ratio (A/F) sensor 1 (bank 2). 
a. Remove harness connector of each sensor, and disconnect the harness from the bracket and middle

clamp.

b. 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.

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m

(19.7 in) onto a hard surface such as a concrete floor; replace with a new sensor.

14. Remove exhaust manifold and three way catalyst heat shields with power tool.
15. Remove the three way catalyst (bank 2) by loosening the bolts first and then removing the nuts and

through bolts.

16. Loosen and remove the exhaust manifold nuts (bank 2) in the

reverse order as shown. 

NOTE:

Number 7 and 8 are not applicable to removal.

17. Remove the exhaust manifold (bank 2) and gasket. 

INSPECTION AFTER REMOVAL

Surface Distortion

• Use a reliable straightedge and feeler gauge to check the flatness

of the exhaust manifold mating surfaces.

• Replace the exhaust manifold if the measurement exceeds specifi-

cations.

INSTALLATION

Tool numbers

: KV10114400 (J-38365)
: KV991J0050 (J-44626)

: Engine front

AWBIA1208GB

Limit

: 0.3 mm (0.012 in)

PBIC1173E

EXHAUST MANIFOLD AND THREE WAY CATALYST

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< REMOVAL AND INSTALLATION >

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Installation is in the reverse order of removal.
1. Install the studs in the exhaust manifold (if removed), and tighten to specification.

2. Install the exhaust manifold gasket in the direction shown. 

3. Install the exhaust manifold (bank 2) nuts and tighten to specifi-

cation in the order shown.

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 mani-

fold threads using the oxygen sensor thread cleaner tool and apply anti-seize lubricant.

• Do not over-tighten the air fuel ratio (A/F) sensor or heated oxygen sensors. Doing so may cause

damage.

Removal and Installation (bank 1)

INFOID:0000000009177906

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 spill-

ing.
1. Remove the cowl top grille and the lower cowl top extension. Refer to 

EXT-25, "Exploded View"

.

2. Remove the right front wheel and tire (4WD models only) using a power tool. Refer to 

WT-58, "Adjust-

ment"

.

3. Remove the engine under cover. Refer to 

EXT-16, "Exploded View"

.

4. Remove the fender protector side cover (4WD models only). Refer to 

EXT-16, "Exploded View"

. 

Exhaust manifold studs

: 15.4 N·m (1.6 kg-m, 11 ft-lb)

(A)

: Bank 1

(B)

: Triangle press

(C)

: Bank 2
: Engine front

PBIC4954E

: Engine front

AWBIA1208GB

Oxygen sensor thread cleaner

: (J-43897-18)

Oxygen sensor thread cleaner

: (J-43897-12)

Tool numbers

: KV10114400 (J-38365)
: KV991J0050 (J-44626)

EM-34

< REMOVAL AND INSTALLATION >

EXHAUST MANIFOLD AND THREE WAY CATALYST

5. Remove transmission air breather hose. Refer to 

TM-196, "Removal and Installation"

. 

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

EX-5, "Exploded View"

.

7. Remove the propeller shaft and propeller shaft center bearing (4WD models only). Refer to 

DLN-103,

"Removal and Installation"

.

8. Remove the RH front axle shaft (4WD models only). Refer to 

FAX-18, "Removal and Installation (RH)"

.

9. Remove the RH three way catalyst support brackets.
10. Remove heated oxygen sensor 2 (bank 1), air fuel ratio (A/F) sensor 1 (bank 1). 
a. Remove harness connector of each sensor, and disconnect the harness from the bracket and middle

clamp.

b. 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.

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m

(19.7 in) onto a hard surface such as a concrete floor; replace with a new sensor.

11. Remove exhaust manifold and three way catalyst heat shields with power tool.
12. Remove the three way catalyst (bank 1) by loosening the bolts first and then removing the nuts and

through bolts.

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

shown.

NOTE:

Number 7 and 8 are not applicable to removal.

14. Remove the exhaust manifold (bank 1) and gasket.

INSPECTION AFTER REMOVAL

Surface Distortion

• Use a reliable straightedge and feeler gauge to check the flatness

of the exhaust manifold mating surfaces.

• Replace the exhaust manifold if the measurement exceeds specifi-

cations.

INSTALLATION

Installation is in the reverse order of removal.
1. Install the studs in the exhaust manifold (if removed), and tighten to specification.

Tool numbers

: KV10114400 (J-38365)
: KV991J0050 (J-44626)

: Engine front

AWBIA1209GB

Limit

: 0.3 mm (0.012 in)

PBIC1173E

Exhaust manifold studs

: 15.4 N·m (1.6 kg-m, 11 ft-lb)

 

 

 

 

 

 

 

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