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Home >> Lexus >> 2019 >> RX 450h Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Intake System / Exhaust System (Service Information) >> Exhaust Manifold >> Removal [10/2015 - ] >> Procedure

Removal [10/2015 - ]: Procedure

  1. REMOVE FRONT WHEEL OPENING EXTENSION PAD LH 

    Refer to PROCEDURE - Step 4 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 4 [08/2016 - 12/2017] , or refer to PROCEDURE - Step 4 [12/2017 - 08/2019] , or refer to PROCEDURE - Step 4 [08/2019 - ]

  2. REMOVE NO. 3 ENGINE UNDER COVER 

    Refer to PROCEDURE - Step 5 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 5 [08/2016 - 12/2017] , or refer to PROCEDURE - Step 5 [12/2017 - 08/2019] , or refer to PROCEDURE - Step 5 [08/2019 - ]

  3. DRAIN ENGINE COOLANT (for Engine) 

    Refer to PROCEDURE - Step 3 [10/2015 - 03/2018] , or refer to PROCEDURE - Step 3 [03/2018 - ]

  4. REMOVE NO. 2 ENGINE UNDER COVER 

    Refer to PROCEDURE - Step 5

  5. REMOVE FRONT WIPER MOTOR AND LINK ASSEMBLY 

    Refer to REMOVAL [10/2015 - ]

  6. REMOVE OUTER COWL TOP PANEL SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 3 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 3 [08/2016 - 08/2019] , or refer to PROCEDURE - Step 3 [08/2019 - ]

  7. REMOVE V-BANK COVER SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 23 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 23 [08/2016 - 12/2017] , or refer to PROCEDURE - Step 23 [12/2017 - 08/2019] , or refer to PROCEDURE - Step 25 [08/2019 - ]

  8. SEPARATE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY 

    See step  [10/2015 - 08/2016], or see step  [08/2016 - 12/2017], or see step  [12/2017 - 08/2019], or see step  [08/2019 - ]

  9. REMOVE RESERVOIR BRACKET 

    Refer to PROCEDURE - Step 13 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 13 [08/2016 - 03/2018] , or refer to PROCEDURE - Step 17 [03/2018 - 08/2018] , or refer to PROCEDURE - Step 17 [08/2018 - 08/2019] , or refer to PROCEDURE - Step 17 [08/2019 - ]

  10. DISCONNECT WIRE HARNESS 

    Refer to PROCEDURE - Step 12

  11. REMOVE NO. 2 EGR PIPE 

    See step  [10/2015 - 08/2016], or see step  [08/2016 - 12/2017], or see step  [12/2017 - 08/2019], or see step  [08/2019 - ]

  12. REMOVE NO. 2 EGR PIPE GASKET 

    See step  [10/2015 - 08/2016], or see step  [08/2016 - 12/2017], or see step  [12/2017 - 08/2019], or see step  [08/2019 - ]

  13. DISCONNECT WATER BY-PASS HOSE ASSEMBLY 

    Refer to PROCEDURE - Step 15

  14. DISCONNECT NO. 6 WATER BY-PASS HOSE 

    Refer to PROCEDURE - Step 16

  15. REMOVE FRONT FLOOR COVER LH 

    Refer to PROCEDURE - Step 1

  16. REMOVE FRONT NO. 3 EXHAUST PIPE SUB-ASSEMBLY 
    WARNING:

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

    1. Disconnect the heated oxygen sensor (for Bank 1) connector.
      GTY642217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage the 2 wire harness clamps.
    3. Remove the 4 bolts, 2 nuts, 2 compression springs and front No. 3 exhaust pipe sub-assembly from the front exhaust pipe assembly and center exhaust pipe sub-assembly (TWC: Rear Catalyst).
      GTY618915Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
    4. Remove the 3 exhaust pipe gaskets from the front No. 3 exhaust pipe sub-assembly.
  17. REMOVE EGR VALVE ASSEMBLY 

    Refer to PROCEDURE - Step 17

  18. REMOVE EGR INLET GASKET 

    Refer to PROCEDURE - Step 18

  19. REMOVE MANIFOLD STAY 
    WARNING:

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

    1. Remove the bolt and nut to remove the manifold stay from the exhaust manifold (TWC: Front Catalyst) and rear engine mounting bracket.
      GTY623834Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
  20. REMOVE AIR FUEL RATIO SENSOR (for Bank 1) 

    Refer to PROCEDURE - Step 9

  21. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst) 
    WARNING:

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

    1. Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold (TWC: Front Catalyst) from the cylinder head sub-assembly RH.
      GTY650215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  22. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 1) 
    1. Remove the exhaust manifold to head gasket (for Bank 1) from the cylinder head sub-assembly RH.
      GTY650216Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  23. REMOVE FRONT EXHAUST PIPE ASSEMBLY 
    WARNING:

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

    1. Disengage the wire harness clamp.
      GTY650212Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the heated oxygen sensor connector.
    3. Loosen the bolt (A).
      GTY671320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
    4. Remove the 2 bolts (B) and exhaust pipe support bracket from the front exhaust pipe assembly.
    5. Remove the 2 nuts and front exhaust pipe assembly from the exhaust manifold (TWC: Front Catalyst).
    6. Remove the exhaust pipe gasket from the front exhaust pipe assembly.
  24. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE 

    Refer to PROCEDURE - Step 2 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 2 [08/2016 - 08/2019] , or refer to PROCEDURE - Step 2 [08/2019 - ]

  25. DISCONNECT NO. 1 RADIATOR HOSE 
    1. Slide the clip and disconnect the No. 1 radiator hose from the radiator assembly.
      GTY679433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  26. REMOVE COOL AIR INTAKE DUCT SEAL 

    Refer to PROCEDURE - Step 1 [10/2015 - 08/2016] , or refer to PROCEDURE - Step 1 [08/2016 - 08/2019] , or refer to PROCEDURE - Step 1 [08/2019 - ]

  27. REMOVE INLET AIR CLEANER ASSEMBLY 

    Refer to PROCEDURE - Step 5

  28. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR 
    WARNING:

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

    1. Disengage the wire harness clamp.
      GTY684226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the air fuel ratio sensor connector.
    3. Remove the 3 bolts and No. 2 exhaust manifold heat insulator from the exhaust manifold assembly LH (TWC: Front Catalyst).
      GTY650239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  29. REMOVE NO. 1 ENGINE COVER 
    1. Disengage the wire harness clamp.
      GTY680824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the No. 1 engine cover.
      GTY650237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  30. REMOVE AIR FUEL RATIO SENSOR (for Bank 2) 

    Refer to PROCEDURE - Step 5

  31. REMOVE NO. 2 MANIFOLD STAY 
    WARNING:

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

    1. Remove the bolt and nut and No. 2 manifold stay from the exhaust manifold assembly LH (TWC: Front Catalyst) and cylinder block sub-assembly.
      GTY656737Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
  32. REMOVE EXHAUST MANIFOLD ASSEMBLY LH (TWC: Front Catalyst) 
    WARNING:

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

    1. Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold assembly LH (TWC: Front Catalyst) from the cylinder head sub-assembly LH.
      GTY627950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  33. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 2) 
    1. Remove the exhaust manifold to head gasket (for Bank 2) from the cylinder head sub-assembly LH.
      GTY675899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  34. REMOVE STUD BOLT 

    HINT: 

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

    1. Using an E8 "TORX" socket wrench, remove the 2 stud bolts (A) from the exhaust manifold (TWC: Front Catalyst).
      GTY671582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using an E6 "TORX" socket wrench, remove the 2 stud bolts (B) from the exhaust manifold (TWC: Front Catalyst).
    3. Using an E8 "TORX" socket wrench, remove the 2 stud bolts from the exhaust manifold assembly LH (TWC: Front Catalyst).
      GTY627947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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