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Home >> Lexus >> 2012 >> IS 250C V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Cylinder Head Assembly >> Service and Repair >> Procedures >> Repair
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Repair





4GR-FSE ENGINE MECHANICAL: CYLINDER HEAD: REPAIR

1. REPAIR INTAKE VALVE SEATS

NOTICE:
* Repair the intake valve seat while checking the seating position.
* Keep the lip free of foreign matter.

(a) Using a 45° cutter, resurface the valve seat so that the valve seat width is greater than the specification.





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





Standard width:

1.0 to 1.4 mm (0.0394 to 0.0551 in.)

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

(d) Check the intake valve seating position.

2. REPAIR EXHAUST VALVE SEATS

NOTICE:
* Repair the seat while checking the seating position.
* Keep the lip free of foreign matter.

(a) Using a 45° cutter, resurface the valve seat so that the valve seat width is greater than the specification.





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





Standard width:

1.2 to 1.6 mm (0.0472 to 0.0630 in.)

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

(d) Check the exhaust valve seating position.
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