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Home >> Lexus >> 2019 >> RX 350L FWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Intake System / Exhaust System - Service Information >> Exhaust Manifold >> Removal [09/2015 - ] >> Procedure

Removal [09/2015 - ]: Procedure

  1. DRAIN ENGINE COOLANT 

    Refer to PROCEDURE - Step 1 [09/2015 - 12/2017] , or refer to PROCEDURE - Step 1 [12/2017 - ]

  2. REMOVE FRONT WHEEL RH 
  3. REMOVE NO. 2 ENGINE UNDER COVER 

    Refer to PROCEDURE - Step 11 [09/2015 - 08/2016] , or refer to PROCEDURE - Step 11 [08/2016 - 12/2017] , or refer to PROCEDURE - Step 11 [12/2017 - 08/2019] , or refer to PROCEDURE - Step 13 [08/2019 - ]

  4. REMOVE AIR FUEL RATIO SENSOR (for Bank 1) 

    Refer to PROCEDURE - Step 6

  5. REMOVE FRONT FLOOR COVER LH 
    1. Remove the clip (A), 2 screws and 4 bolts from the front floor cover LH.
      GTY672038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for TMC Made
      *B for TMMC Made
      Bolt
      Screw
    2. Disconnect the 2 clips (B) to remove the front floor cover LH.
  6. 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. Disengage the 4 wire harness clamps.
      GTY665651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the heated oxygen sensor (for Bank 1) connector.
    3. Remove the 4 bolts, 2 nuts and 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).
      GTY674294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
    4. Remove the 3 exhaust pipe gaskets from the front No. 3 exhaust pipe sub-assembly, front exhaust pipe assembly and center exhaust pipe sub-assembly (TWC: Rear Catalyst).
  7. REMOVE MANIFOLD STAY 
    WARNING:

    To prevent burns, do not touch the engine, exhaust manifold 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.
      GTY675793Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
  8. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst) 
    WARNING:

    To prevent burns, do not touch the engine, exhaust manifold 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.
      GTY628024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 1) 
    1. Remove the exhaust manifold to head gasket from the cylinder head sub-assembly RH.
      GTY628026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side) 

    See step  7 [09/2015 - 12/2017], or see step  8 [12/2017 - ]

  11. REMOVE FRONT EXHAUST PIPE ASSEMBLY 

    See step  8 [09/2015 - 12/2017], or see step  9 [12/2017 - ]

  12. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE 

    Refer to PROCEDURE - Step 16 [09/2015 - 08/2016] , or refer to PROCEDURE - Step 16 [08/2016 - 12/2017] , or refer to PROCEDURE - Step 16 [12/2017 - 08/2019] , or refer to PROCEDURE - Step 16 [08/2019 - ]

  13. REMOVE V-BANK COVER SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 23 [09/2015 - 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 - ]

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

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

    1. Disconnect the air fuel ratio sensor connector.
      GTY665652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage the wire harness clamp.
    3. Remove the 3 bolts and No. 2 exhaust manifold heat insulator from the exhaust manifold assembly LH (TWC: Front Catalyst).
      GTY628022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE AIR FUEL RATIO SENSOR (for Bank 2) 

    Refer to PROCEDURE - Step 3

  16. REMOVE NO. 2 MANIFOLD STAY 
    WARNING:

    To prevent burns, do not touch the engine, exhaust manifold 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.
      GTY656744Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Bolt
      Nut
  17. REMOVE EXHAUST MANIFOLD ASSEMBLY LH (TWC: Front Catalyst) 
    WARNING:

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

    1. Disconnect the 2 No. 2 cooling fan motor connectors.
      GTY628023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Slide the clip and disconnect the No. 1 radiator hose from the radiator assembly.
      GTY627951Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold assembly LH (TWC: Front Catalyst).
      GTY627950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 2) 
    1. Remove the exhaust manifold to head gasket from the cylinder head sub-assembly.
      GTY675899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE STUD BOLT 

    HINT: 

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

    1. Using an E8 "TORX" socket wrench, remove the 2 stud bolts from the exhaust manifold (TWC: Front Catalyst).
      GTY627952Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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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