2002 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Partial Engine: Replacement

  1. INSTALL ENGINE STAND

    REMOVE THROTTLE BODY ASSEMBLY, see REMOVAL (GS430, LS430 & SC430) .

  2. REMOVE INTAKE MANIFOLD ASSEMBLY
    1. Disconnect the VSV connector for EVAP.
    2. Disconnect the EVAP hose from the VSV for EVAP.
    3. Remove the bolt, disconnect the VSV for EVAP from the upper intake manifold.
    4. Remove the bolt and V-bank cover bracket No. 2.
    5. Remove the bolt and V-bank cover bracket No. 3.
    6. Disconnect the VSV connector for ACIS.
    7. Remove the bolt and V-bank cover bracket No. 1.
    8. Remove the bolt and V-bank cover fastener.
    9. Remove the 4 bolts, and disconnect the engine wire protector (LH side) from upper intake manifold and camshaft bearing cap.
    10. Disconnect the 2 wire clamps on the engine wire (RH side) from the brackets on the RH delivery pipe.
    11. Remove the 2 bolts, and disconnect the engine wire protector (rear side) from the rear water bypass joint and RH cylinder head.
    12. Disconnect the 8 injector connectors.
    13. Remove the 6 bolts, 4 nuts, the intake manifold assembly and 2 gaskets.
  3. REMOVE STARTER ASSEMBLY, see REMOVAL & INSTALLATION .
  4. REMOVE GENERATOR ASSEMBLY, see REPLACEMENT .

    REMOVE TIMING BELT COVER SUB-ASSEMBLY N0. 3 LH, see REPLACEMENT .

    1. Remove the cap nut and disconnect the water by-pass pipe No. 3 from the timing belt cover.
    2. Disconnect the 2 water by-pass hoses from the water by-pass pipe No. 3.
    3. Disconnect the engine wire from the 2 wire clamps.
    4. Disconnect the camshaft position sensor connector.
    5. Disconnect the camshaft position sensor wire from the wire clamp on the timing belt cover.
    6. Remove the wire grommet from the timing belt cover.
    7. Remove the 4 bolts.
    8. Disconnect the timing belt cover from the timing plate and camshaft bearing cap.
    9. Disconnect the wire clamp for the sensor from the timing belt cover.
    10. Remove the connector holder from the sensor connector.
    11. Remove the timing belt cover.
  5. REMOVE TIMING CHAIN OR BELT COVER NO. 2
    1. Disconnect the 2 PS air hoses from the clamp on the timing belt cover No. 2.
    2. Remove the cap nut, 3 bolts, timing belt cover No. 2 and gasket.
  6. REMOVE WATER INLET HOUSING, see REPLACEMENT .
  7. REMOVE WATER BY-PASS JOINT FR
    1. Disconnect the ECT sensor connector.
    2. Remove the 4 nuts, water by-pass joint and 2 gaskets.
  8. REMOVE WATER BY-PASS JOINT RR
    1. Disconnect the heater inlet hose from the water by-pass joint.
    2. Remove the 4 nuts, water by-pass joint and 2 gaskets.
  9. REMOVE WATER BY-PASS PIPE SUB-ASSEMBLY
    1. Disconnect the heater outlet hose from the water by-pass pipe.
    2. Disconnect the wire clamp (for knock sensor 1, 2) from bracket of the water by-pass pipe.
    3. Remove the bolt.
    4. Pull out the water by-pass pipe from the water pump.
    5. Remove the O-ring from the water by-pass pipe.
  10. REMOVE OIL LEVEL GAGE GUIDE
  11. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
  12. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
  13. REMOVE CAM POSITION SENSOR ASSEMBLY
  14. REMOVE VVT SENSOR
  15. REMOVE KNOCK CONTROL SENSOR
  16. REMOVE ENGINE HANGER NO. 1
  17. REMOVE ENGINE HANGER NO. 2
  18. REMOVE IGNITION COIL ASSEMBLY
  19. REMOVE OIL FILTER BRACKET SUB-ASSEMBLY
    1. Disconnect the oil pressure switch connector.
    2. Remove the stud bolt, 2 nuts and oil filter bracket with gasket.
  20. REMOVE CRANK POSITION SENSOR
  21. REMOVE ENGINE OIL LEVEL SENSOR
  22. REMOVE ENGINE WIRE
  23. REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO. 1
  24. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY RH
  25. REMOVE EXHAUST MANIFOLD HEAT INSULATOR NO. 2
  26. REMOVE EXHAUST MANIFOLD SUB-ASSEMBLY LH
  27. REMOVE WIRING HARNESS HEAT INSULATOR NO. 2
  28. REMOVE ENGINE MOUNTING BRACKET FRONT NO. 1 RH
  29. REMOVE ENGINE MOUNTING BRACKET FRONT NO. 1 LH
  30. INSTALL ENGINE MOUNTING BRACKET FRONT NO. 1 LH
    1. Install the mounting bracket with the 4 bolts
      Fig 1: Installing Engine Mounting Bracket Front No. 1 (LH)
      G03387247Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 36 N.m (370 kgf.cm, 27 ft.lbf) 

    NOTE: The LH mounting bracket is marked with "L".
  31. INSTALL ENGINE MOUNTING BRACKET FRONT NO. 1 RH
    1. Install the mounting bracket with the 4 bolts

      Torque: 36 N.m (370 kgf.cm, 27 ft.lbf) 

    NOTE: The RH mounting bracket is marked with "R".
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.