Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Repair

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Mechanical) / Cylinder Head / Repair

REPAIR

CAUTION / NOTICE / HINT

HINT:

  • Use the same procedure for bank 1 and bank 2.
  • The following procedure is for bank 2.

PROCEDURE

1. REPAIR INTAKE VALVE SEAT

NOTICE:

  • Repair the intake valve seat while checking the seating position.
  • Release the cutter gradually to make the intake valve seat smooth.

(a) Using a 45° cutter, resurface the intake valve seat so that the intake valve seat width is more than the standard.

(b) Using 30° and 60° cutters, correct the intake valve seat so that the intake valve contacts the entire circumference of the intake valve seat. The contact should be in the center of the intake valve seat, and the intake valve seat width should be as specified around the entire circumference of the intake valve seat.

Standard Width:

1.1 to 1.5 mm (0.0433 to 0.0591 in.)

*a

Width

*b

60°

*c

45°

*d

30°

(c) Hand lap the intake valve and intake valve seat with an abrasive compound.

(d) Check the intake valve seating position.

2. REPAIR EXHAUST VALVE SEAT

NOTICE:

  • Repair the exhaust valve seat while checking the seating position.
  • Release the cutter gradually to make the exhaust valve seat smooth.

(a) Using a 45° cutter, resurface the exhaust valve seat so that the exhaust valve seat width is more than the standard.

(b) Using 30° and 75° cutters, correct the exhaust valve seat so that the exhaust valve contacts the entire circumference of the exhaust valve seat. The contact should be in the center of the exhaust valve seat, and the exhaust valve seat width should be as specified around the entire circumference of the exhaust valve seat.

Standard Width:

1.1 to 1.5 mm (0.0433 to 0.0591 in.)

*a

Width

*b

75°

*c

45°

*d

30°

(c) Hand lap the exhaust valve and exhaust valve seat with an abrasive compound.

(d) Check the exhaust valve seating position.

    Inspection
    INSPECTION CAUTION / NOTICE / HINT HINT: Use the same procedure for bank 1 and bank 2. The following procedure is for bank 2. PROCEDURE 1. INSPECT CYLINDER HEAD LH (a) Using a precision straig ...

    Replacement
    REPLACEMENT CAUTION / NOTICE / HINT HINT: Use the same procedure for bank 1 and bank 2. The following procedure is for bank 2. PROCEDURE 1. REPLACE INTAKE VALVE GUIDE BUSH (a) Heat the cylinde ...

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