Installation [07/2020 - ]: Procedure

1. Install the No. 2 exhaust manifold heat insulator to the exhaust manifold (TWC: Front Catalyst) with the 3 bolts.

   Torque: 11 N*m (112 kgf*cm, 8 ft.*lbf) 

1. Install a new exhaust manifold to head gasket to the cylinder head sub-assembly.
2. Temporarily install the exhaust manifold (TWC: Front Catalyst), No. 1 exhaust manifold heat insulator and No. 1 front floor heat insulator.

   HINT: 

   At this time, do not install the parts with bolts or nuts.

3. Fig 1: Exhaust Manifold (TWC: Front Catalyst) Tightening Sequence

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Temporarily install the exhaust manifold (TWC: Front Catalyst) to the cylinder head sub-assembly with 7 new nuts.

4. Tighten the 7 nuts in the order shown in the illustration.

   Torque: 26 N*m (265 kgf*cm, 19 ft.*lbf) 

1. Connect the flow shutting valve (water by-pass hose assembly) with the bolt.

   Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf) 

2. Connect the flow shutting valve (water by-pass hose assembly) connector.
3. Connect the No. 2 water by-pass pipe sub-assembly with the bolt.

   Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf) 

1. Temporarily install the manifold stay to the exhaust manifold (TWC: Front Catalyst) and cylinder block sub-assembly with the bolt and nut.
   Fig 2: Manifold Stay Tightening Sequence

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Tighten the bolt and nut in the order shown in the illustration.

   Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) 

1. Install the No. 1 front floor heat insulator to the vehicle body with the 2 nuts.

   Torque: 4.9 N*m (50 kgf*cm, 43 in.*lbf) 

1. Install the No. 1 exhaust manifold heat insulator to the exhaust manifold (TWC: Front Catalyst) with the 3 bolts.

   Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) 

1. Install the wiring harness clamp bracket with the bolt.

   Torque: 13 N*m (133 kgf*cm, 10 ft.*lbf) 

Refer to INSTALLATION [07/2020 - ]

Refer to PROCEDURE - Step 15

Refer to PROCEDURE - Step 16

Refer to INSTALLATION [07/2020 - ]

1. Install 2 new gaskets to the front exhaust pipe assembly (TWC: Rear Catalyst).
2. Connect the front exhaust pipe assembly (TWC: Rear Catalyst) to the 2 exhaust pipe supports.
3. Install the front exhaust pipe assembly (TWC: Rear Catalyst) to the exhaust manifold (TWC: Front Catalyst) and tail exhaust pipe assembly with 2 bolts and 2 nuts.

   Torque: 43 N*m (438 kgf*cm, 32 ft.*lbf) 

4. Connect the air fuel ratio sensor (for sensor 2) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Tube
   *b	Wire Harness Clamp

5. Engage the 2 wire harness clamps so that the tube is positioned as shown in the illustration.

See step  5

Refer to PROCEDURE - Step 14

Refer to PROCEDURE - Step 6