Nissan Altima 2007-2012 Service Manual: On-vehicle repair

EXHAUST SYSTEM (QR25DE)

Exploded View

1. RH rear muffler bracket

2. Gasket

3. Front exhaust tube

4. Ring gasket

5. Front exhaust tube hanger

6. Center exhaust tube

7. Mounting rubber

8. Center exhaust tube hanger

9. Gasket

10. Mounting rubber

11. Rear muffler

12. LH muffler tip

13. RH muffler tip

14. Ground strap

1. RH rear muffler bracket

2. Gasket

3. Front exhaust tube

4. Ring gasket

5. Front exhaust tube hanger

6. Center exhaust tube

7. Mounting rubber

8. Center exhaust tube hanger

9. LH rear muffler

10. Ground strap

11. LH rear muffler bracket

12. LH muffler tip

13. RH muffler tip

14. RH rear muffler

Removal and Installation

WARNING: • Perform the procedure with the exhaust system fully cooled down because the system will be hot just after the engine is turned off.

• Be careful not to cut your hand on the insulator edges.

CAUTION: • Use genuine NISSAN exhaust system parts or equivalent, which are specifically designed for heat resistance, corrosion resistance, and shape.

REMOVAL

Remove exhaust system components using power tools.

• Remove heated oxygen sensor using Tool as needed.

Tool number : KV10114400 (J-38365)

INSTALLATION

Installation is in the reverse order of removal. CAUTION: • Always replace exhaust gaskets with new ones when reassembling.

• Before installing a new heated oxygen sensor, clean and lube the exhaust tube threads using suitable tool.

Oxygen sensor thread cleaner : — (J-43897-18) Oxygen sensor thread cleaner : — (J-43897-12)

• 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; install a new one.

• Do not over-tighten the heated oxygen sensor. Doing so may damage the heated oxygen sensor, resulting in the MIL coming on.

• If any mounting insulator is badly deformed, repair or replace it. If deposits such as mud pile up on the mounting insulator, clean and inspect them.

• When installing the insulator avoid large gaps or interference between the insulator and each exhaust pipe.

• Remove deposits from the sealing surface of each connection. Connect them securely to avoid exhaust gas leaks.

• Temporarily tighten the exhaust manifold side nuts and the vehicle side bolts. Check each part for any interference, and then tighten the nuts and bolts to specification.

• When installing each mounting rubber, avoid twisting or excessive extension in up/down and right/ left directions.

• Tighten the bolts without causing interference with the flange.

Inspection After Installation

• With the engine running, check the exhaust tube joints for exhaust gas leaks and abnormal noise.

• Check that the mounting brackets and mounting insulators are installed properly and free from excessive stress. Improper installation could result in excessive noise, leaks, and vibration.

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