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Home >> Lexus >> 2008 >> GS 350 AWD V6-3.5L (2GR-FSE) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Service and Repair >> Procedures
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Procedures









2GR-FSE ENGINE MECHANICAL: ENGINE UNIT: REPAIR

1. REPAIR INTAKE VALVE SEAT
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 more than the specification.






(b) Using 30° and 60° cutters, correct the valve seat so that the valve contacts the entire circumference of the seat. The contact should be in the center of the valve seat, and the valve seat width should be maintained within the specified range around the entire circumference of the seat.
Standard width:
1.1 to 1.5 mm (0.043 to 0.059 in.)
(c) Hand-lap the valve and valve seat with an abrasive compound.
(d) Check the valve seating position.
2. REPAIR EXHAUST VALVE SEAT
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 more than the specification.






(b) Using 30° and 75° cutters, correct the valve seat so that the valve contacts the entire circumference of the seat. The contact should be in the center of the valve seat, and the valve seat width should be maintained within the specified range around the entire circumference of the seat.
Standard width:
1.3 to 1.7 mm (0.051 to 0.067 in.)
(c) Hand-lap the valve and valve seat with an abrasive compound.
(d) Check the valve seating position.
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