Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during exhaust manifold assembly RH (TWC: Front Catalyst) and exhaust manifold assembly LH (TWC: Front Catalyst) removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced

Replaced Part or Performed Procedure

Necessary Procedure

Effect/Inoperative Function when Necessary Procedure not Performed

Link

  • Replacement of air fuel ratio sensor
  • Gas leak from exhaust system is repaired

Inspection After Repair

  • Poor idle, etc.
  • Engine start function, etc.

CAUTION:

  • To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.
  • To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.

PROCEDURE

1. REMOVE FRONT FLOOR COVER LH

Click here

2. REMOVE FRONT FLOOR COVER RH

Click here

3. REMOVE BODY MOUNTING PLATE

Click here

4. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

Click here

5. REMOVE FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)

(a) Disconnect the 2 heated oxygen sensor connectors.

(b) Disengage the 2 wire harness clamps.

(c) Remove the 4 bolts, 4 nuts and disconnect the front exhaust pipe assembly (TWC: Rear Catalyst).

(d) Remove the front exhaust pipe assembly (TWC: Rear Catalyst) from the exhaust pipe support.

(e) Remove the 3 gaskets from the front exhaust pipe assembly (TWC: Rear Catalyst).

6. REMOVE AIR FUEL RATIO SENSOR (for Bank 1)

Click here

7. REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR

(a) Remove the 3 bolts and No. 1 exhaust manifold heat insulator from the exhaust manifold assembly RH (TWC: Front Catalyst).

8. REMOVE EXHAUST MANIFOLD ASSEMBLY RH (TWC: Front Catalyst)

(a) Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold assembly RH (TWC: Front Catalyst) from the cylinder head sub-assembly RH.

9. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 1)

(a) Remove the exhaust manifold to head gasket (for Bank 1) from the cylinder head sub-assembly RH.

10. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH

Click here

11. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH

Click here

12. REMOVE NO. 1 ENGINE UNDER COVER

Click here

13. REMOVE REAR ENGINE UNDER COVER RH

Click here

14. REMOVE V-BANK COVER SUB-ASSEMBLY

Click here

15. REMOVE COOL AIR INTAKE DUCT SEAL

Click here

16. REMOVE AIR FUEL RATIO SENSOR (for Bank 2)

Click here

17. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE

Click here

18. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR

(a) Remove the 3 bolts and No. 2 exhaust manifold heat insulator from the exhaust manifold assembly LH (TWC: Front Catalyst).

19. REMOVE NO. 2 MANIFOLD STAY

(a) Remove the bolt, nut and No. 2 manifold stay from the exhaust manifold assembly LH (TWC: Front Catalyst) and cylinder block sub-assembly.

Bolt

Nut

20. DISCONNECT NO. 5 WATER BY-PASS HOSE

(a) Disengage the 2 clamps to disconnect the No. 5 water by-pass hose and No. 6 water by-pass hose from the hose clamp.

21. REMOVE EXHAUST MANIFOLD ASSEMBLY LH (TWC: Front Catalyst)

(a) Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold assembly LH (TWC: Front Catalyst).

22. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 2)

(a) Remove the exhaust manifold to head gasket (for Bank 2) from the cylinder head sub-assembly.

23. REMOVE STUD BOLT

HINT:

If a stud bolt is deformed or its threads are damaged, replace it.

(a) Using an E8 "TORX" socket wrench, remove the 2 stud bolts from the exhaust manifold assembly LH (TWC: Front Catalyst).

    Installation

    Exhaust Pipe

    See More:

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