Installation [08/2020 - ]: Procedure

1. Install the No. 2 exhaust manifold heat insulator to the exhaust manifold (TWC: Front Catalyst) with the 6 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 upper front floor heat insulator and No. 1 exhaust manifold heat insulator.

   HINT: 

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

3. Fig 1: Nut 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. Using a 12 mm deep socket wrench, tighten the 7 nuts in the order shown in the illustration.

   Torque: 26 N*m (265 kgf*cm, 19 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: Bolt and Nut 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. Using a 10 mm union nut wrench, install the No. 1 exhaust manifold heat insulator to the exhaust manifold (TWC: Front Catalyst) with the 5 bolts.

   Specified tightening torque 

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

   HINT: 

   • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

     Refer to PRECAUTION [04/2018 - ]

   • When using a 10 mm union nut wrench (fulcrum length of 22 mm (0.866 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 8.8 N*m (90 kgf*cm, 78 in.*lbf)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Torque Wrench Fulcrum Length

1. Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Torque Wrench Fulcrum Length

   Using a 10 mm union nut wrench, install the No. 1 upper front floor heat insulator to the vehicle body with the 3 nuts.

   Specified tightening torque 

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

   HINT: 

   • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

     Refer to PRECAUTION [04/2018 - ]

   • When using a 10 mm union nut wrench (fulcrum length of 22 mm (0.866 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)): 4.3 N*m (44 kgf*cm, 38 in.*lbf)

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

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

Refer to INSTALLATION [08/2020 - ]

Refer to PROCEDURE - Step 5 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 5 [08/2021 -]

Refer to PROCEDURE - Step 3

Refer to PROCEDURE - Step 4

Refer to INSTALLATION [08/2020 - ]

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 center exhaust pipe assembly with 2 new bolts and 2 new nuts.

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

4. Connect the air fuel ratio sensor (for sensor 2) connector.
5. Engage the 2 wire harness clamps.

See step  6

See step  7

See step  8

See step  9

See step  10

Refer to PROCEDURE - Step 70

Refer to PROCEDURE - Step 71

Refer to PROCEDURE - Step 72

Refer to PROCEDURE - Step 73