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.

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

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2. REMOVE FRONT FLOOR COVER RH

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3. REMOVE BODY MOUNTING PLATE

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

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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)

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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

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11. REMOVE FRONT WHEEL OPENING EXTENSION PAD RH

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12. REMOVE NO. 1 ENGINE UNDER COVER

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13. REMOVE REAR ENGINE UNDER COVER RH

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14. REMOVE V-BANK COVER SUB-ASSEMBLY

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15. REMOVE COOL AIR INTAKE DUCT SEAL

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

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17. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE

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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).