Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Installation

INSTALLATION

PROCEDURE

1. INSTALL STUD BOLT

HINT:

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

(a) Using an E8 "TORX" socket wrench, install the 2 stud bolts to the exhaust manifold (TWC: Front Catalyst).

Torque:

19.5 N·m {199 kgf·cm, 14 ft·lbf}

(b) Using an E8 "TORX" socket wrench, install the 2 stud bolts to the exhaust manifold assembly LH (TWC: Front Catalyst).

Torque:

19.5 N·m {199 kgf·cm, 14 ft·lbf}

2. INSTALL EXHAUST MANIFOLD TO HEAD GASKET (for Bank 2)

(a) Install a new exhaust manifold to head gasket to the cylinder head sub-assembly.

3. INSTALL EXHAUST MANIFOLD ASSEMBLY LH (TWC: Front Catalyst)

(a) Temporarily install the exhaust manifold assembly LH (TWC: Front Catalyst) with the 4 nuts.

(b) Temporarily install the No. 2 manifold stay to the exhaust manifold assembly LH (TWC: Front Catalyst) and cylinder block sub-assembly with the bolt and nut.

(c) Using a 12 mm deep socket wrench, tighten the 4 nuts in the order shown in the illustration.

Torque:

21 N·m {214 kgf·cm, 15 ft·lbf}

(d) Tighten the bolt and nut in the order shown in the illustration.

Bolt

Nut

Torque:

34 N·m {347 kgf·cm, 25 ft·lbf}

(e) Connect the No. 1 radiator hose to the radiator assembly and slide the clip to secure it.

(f) Connect the 2 No. 2 cooling fan motor connectors.

4. INSTALL AIR FUEL RATIO SENSOR (for Bank 2)

Click here

5. INSTALL NO. 2 EXHAUST MANIFOLD HEAT INSULATOR

(a) Install the No. 2 exhaust manifold heat insulator to the exhaust manifold assembly LH (TWC: Front Catalyst) with the 3 bolts in the order shown in the illustration.

Torque:

8.5 N·m {87 kgf·cm, 75 in·lbf}

(b) Engage the wire harness clamp.

(c) Connect the air fuel ratio sensor connector.

6. INSTALL V-BANK COVER SUB-ASSEMBLY

Click here

7. INSTALL ENGINE OIL LEVEL DIPSTICK GUIDE

Click here

8. INSTALL FRONT EXHAUST PIPE ASSEMBLY

Click here

9. INSTALL NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

Click here

10. INSTALL EXHAUST MANIFOLD TO HEAD GASKET (for Bank 1)

(a) Install a new exhaust manifold to head gasket to the cylinder head sub-assembly RH.

11. INSTALL EXHAUST MANIFOLD (TWC: Front Catalyst)

(a) Temporarily install the exhaust manifold (TWC: Front Catalyst) with the 4 nuts.

(b) Temporarily install the manifold stay to the exhaust manifold (TWC: Front Catalyst) and rear engine mounting bracket with the bolt and nut.

(c) Using a 12 mm deep socket wrench, tighten the 4 nuts in the order shown in the illustration.

Torque:

21 N·m {214 kgf·cm, 15 ft·lbf}

(d) Tighten the bolt and nut in the order shown in the illustration.

Torque:

34 N·m {347 kgf·cm, 25 ft·lbf}

Bolt

Nut

12. INSTALL FRONT NO. 3 EXHAUST PIPE SUB-ASSEMBLY

(a) Using a vernier caliper, measure the free length of the 2 compression springs.

Standard Length

43.0 mm (1.69 in.)

Minimum Free Length

41.5 mm (1.63 in.)

If the free length is less than minimum, replace the compression spring.

(b) Temporarily install a new exhaust pipe gasket to the front No. 3 exhaust pipe sub-assembly (center exhaust pipe assembly (TWC: Rear Catalyst) side).

(c) Using a plastic hammer and wooden block, tap in the exhaust pipe gasket until its surface is flush with the front No. 3 exhaust pipe sub-assembly.

NOTICE:

  • Be careful with the installation direction of the exhaust pipe gasket.
  • Do not reuse the exhaust pipe gasket.
  • Do not damage the exhaust pipe gasket.
  • Do not push in the exhaust pipe gasket by using the exhaust pipes when connecting them.

*1

Front No. 3 Exhaust Pipe Sub-assembly

*2

Exhaust Pipe Gasket

*a

Wooden Block

(d) Install 2 new exhaust pipe gaskets to the front No. 3 exhaust pipe sub-assembly.

(e) Temporarily install the front No. 3 exhaust pipe sub-assembly with the 4 bolts, 2 nuts and 2 compression springs.

(f) Tighten the 2 bolts and 2 nuts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

(g) Tighten the 2 bolts and 2 compression springs.

Torque:

43 N·m {438 kgf·cm, 32 ft·lbf}

HINT:

After installation, check that the space between the flanges of the center exhaust pipe assembly (TWC: Rear Catalyst) and front No. 3 exhaust pipe sub-assembly is consistent front-to-rear and left-to-right.

*1

Center Exhaust Pipe Assembly (TWC: Rear Catalyst)

*2

Front No. 3 Exhaust Pipe Sub-assembly

*3

Exhaust Pipe Gasket

*a

Space between Flanges: 8.5 mm (0.335 in.)

(h) Connect the heated oxygen sensor (for Bank 1) connector.

(i) Engage the 4 wire harness clamps.

13. INSTALL FRONT FLOOR COVER LH

(a) Install the front floor cover LH with the 2 clips (B).

*A

for TMC Made

*B

for TMMC Made

Bolt

Screw

(b) Install the clip (A), 2 screws and 4 bolts to the front floor cover LH.

14. INSTALL AIR FUEL RATIO SENSOR (for Bank 1)

Click here

15. INSTALL NO. 2 ENGINE UNDER COVER

Click here

16. ADD ENGINE COOLANT

Click here

17. INSPECT FOR COOLANT LEAK

Click here

18. INSPECT FOR EXHAUST GAS LEAK

Click here

    Components
    COMPONENTS ILLUSTRATION *A for TMC Made - - *1 NO. 2 ENGINE UNDER COVER *2 FRONT FLOOR COVER LH ILLUSTRATION *A for TMMC Made - - *1 NO. 2 ENGINE UNDER COVER * ...

    Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during exha ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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