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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Engine Mechanical - 1.8L (Lay)) >> Repair Instructions - Off Vehicle >> Valve Guide Reaming, and Valve and Seat Grinding >> Intake and Exhaust Valves

Intake and Exhaust Valves

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Valve Seat Repair
    GM2017242Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Repair the seat while checking the seating position.
    • Keep the lip free of foreign matter.
  1. Using a 45 degree cutter, resurface the valve seat so that the valve seat width is more than the specification.
    2. Fig 2: Identifying Valve Face Angles
    GM2017244Courtesy of GENERAL MOTORS CORP.
  2. Using 30 degree and 75 degree 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.
  3. Handrub the valve and valve seat with an abrasive compound.
  4. Check the valve seating position.
Select A New Guide Bush (STD or O/S 0.05)

Bush Size Bush Bore Diameter
STD 10.285 to 10.306 mm (0.4049 to 0.4057 in)
O/S 0.05 10.335 to 10.356 mm (0.4069 to 0.4077 in)
Valve Seat Width

Item Specified Condition
Intake Side 1.0 to 1.4 mm (0.039 to 0.055 in)
Exhaust Side 1.0 to 1.4 mm (0.039 to 0.055 in)
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