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Installation [11/2021 - 03/2022]: Procedure

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSTALL NO. 2 EXHAUST MANIFOLD HEAT INSULATOR 

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

  2. INSTALL EXHAUST MANIFOLD TO HEAD GASKET 
  3. INSTALL EXHAUST MANIFOLD (TWC: Front Catalyst) 
    1. Fig 1: Exhaust Manifold Nuts Tightening Sequence (TWC: Front Catalyst)
      GTY1079095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Exhaust Manifold (TWC: Front Catalyst) *2 No. 1 Exhaust Manifold Heat Insulator
      *3 No. 1 Front Floor Heat Insulator - -
      1. 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.

      2. Temporarily install the exhaust manifold (TWC: Front Catalyst) to the cylinder head sub-assembly with 7 new nuts.
      3. Tighten the 7 nuts in the order shown in the illustration.

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

  4. INSTALL FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY) 

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

  5. INSTALL NO. 2 WATER BY-PASS PIPE SUB-ASSEMBLY 

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

  6. INSTALL MANIFOLD STAY 
    1. Fig 2: Manifold Stay Bolt And Nut Tightening Sequence (TWC: Front Catalyst)
      GTY1080077Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Temporarily install the manifold stay to the exhaust manifold (TWC: Front Catalyst) and cylinder block sub-assembly with the bolt and nut.
      2. Tighten the bolt and nut in the order shown in the illustration.

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

  7. INSTALL NO. 1 FRONT FLOOR HEAT INSULATOR 

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

  8. INSTALL NO. 1 EXHAUST MANIFOLD HEAT INSULATOR 

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

  9. INSTALL WIRING HARNESS CLAMP BRACKET 

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

  10. INSTALL AIR FUEL RATIO SENSOR (for Sensor 1) 
    Refer to INSTALLATION [11/2021 - ]
  11. INSTALL COWL VENTILATOR PANEL SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 17

  12. INSTALL COWL VENTILATOR SPLASH SHIELD LH 
  13. INSTALL WINDSHIELD WIPER MOTOR AND LINK ASSEMBLY 

    Refer to INSTALLATION [11/2021 - ]

  14. INSTALL HOOD TO FRONT FENDER SEAL RH 
  15. INSTALL HOOD TO FRONT FENDER SEAL LH 
  16. INSTALL FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst) 

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

  17. INSPECT FOR EXHAUST GAS LEAK 

    Refer to INITIALIZATION [11/2021 - ]

  18. INSTALL ENGINE UNDER COVER HEAT INSULATOR 
  19. INSTALL NO. 2 ENGINE UNDER COVER ASSEMBLY 

    Torque: 7.5 N.m (76 kgf/cm, 66 in.lbf) 

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