Cylinder Head Disassembly

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Uz-Fe Engine Mechanical. Lexus Gs430, Gs300. Uzs190 Grs190

  1. REMOVE VALVE LIFTER

  2. REMOVE INTAKE VALVE

  3. REMOVE EXHAUST VALVE

  4. REMOVE VALVE STEM OIL SEAL

  5. REMOVE CAMSHAFT TIMING TUBE ASSEMBLY

  6. REMOVE CAMSHAFT SUB GEAR

Cylinder Head -- Disassembly



1. REMOVE VALVE LIFTER
  1. Remove the valve lifter and adjusting shim.

    HINT:
    Arrange the valve lifters and shims in the correct order.


2. REMOVE INTAKE VALVE


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using SST, compress the compression spring and remove the 2 keepers.

    SST
    09202-70020(09202-00010)
  1. Remove the spring retainer, compression spring, valve and spring seat.

    HINT:
    Arrange the valves, compression springs, spring seats and spring retainers in the correct order.


3. REMOVE EXHAUST VALVE


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using SST, compress the compression spring and remove the 2 keepers.

    SST
    09202-70020(09202-00010)
  1. Remove the spring retainer, compression spring, valve and spring seat.

    HINT:
    Arrange the valves, compression springs, spring seats and spring retainers in the correct order.


4. REMOVE VALVE STEM OIL SEAL


    Lexus Gs430, Gs300. Uzs190 Grs190
  1. Using needle nose pliers, remove the oil seal.



5. REMOVE CAMSHAFT TIMING TUBE ASSEMBLY


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Mount the hexagon head portion of the camshaft in a vise.

    NOTICE:
    1. Be careful not to damage the camshaft.
    2. Do not remove the 4 bolts shown in the illustration. The bolts determine the backlash of the gear in the timing tube. If any of the bolts are removed, install a new timing tube assembly.
  1. Remove the screw plug and seal washer.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using a 10 mm hexagon wrench, remove the bolt.

  1. Pull out the timing tube and drive gear from the camshaft.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using SST and a 5 mm hexagon wrench, remove the 4 bolts, drive gear and oil seal.

    SST
    09960-10010(09962-01000,09963-00500)
    NOTICE:
    Be careful not to damage the timing tube.


6. REMOVE CAMSHAFT SUB GEAR


    Lexus Gs430, Gs300. Uzs190 Grs190
  1. Mount the hexagon head portion of the camshaft in a vise.

    NOTICE:
    Be careful not to damage the camshaft.


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using SST, turn the sub gear clockwise and remove the service bolt.

    SST
    09960-10010(09962-01000,09963-00500)


    Lexus Gs430, Gs300. Uzs190 Grs190
  1. Using snap ring pliers, remove the snap ring.

  1. Remove the wave washer, sub gear and bolt washer.

    HINT:
    Arrange the driven sub gears and bolt washers (RH and LH sides).


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Engine Mechanical.Engine.Cylinder Head  Disassembly
  1. Using a vernier caliper, measure the free distance between the washer ends.

    Free distance:
    18.2 to 18.8 mm (0.712 to 0.740 in.)
    If the free distance is not as specified, replace the washer.