LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 995 (Engine Mechanical - 8.1L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Valve Guide Reaming/Valve and Seat Grinding >> Valve Seat Reconditioning Procedure

Valve Seat Reconditioning Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: Several different types of equipment are available for reconditioning valve seats. Use the manufacturers recommendations of equipment to attain the proper results.
    IMPORTANT: Always recondition the valve seat after reaming the valve guide bores or installing new valves.
  1. Recondition the valve seats.
  2. The valves must seat perfectly for the engine to deliver optimum power and performance.
  3. Correct contact (1) between each valve and its seat in the cylinder head is also essential to ensure that the heat in the valve head is properly carried away.
    4. Fig 1: View Of Valve Contact Face Measurements
    GM53234Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Regardless of what type of equipment is used, it is essential that the valve guide bores are free from carbon or dirt to ensure the proper centering of the pilot in the guide.
  4. The valve seats should be concentric to within 0.050 mm (0.002 in) total indicator runout.
scientia non olet · About LEMON Manuals