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VALVE SEATS CAUTION: Do not un-shroud valves during valve 1. When refacing valve seats, it is important that the correct size valve guide pilot be used for reseating 2. Measure the concentricity of valve seat using a dial indicator. Total runout should not exceed 0.051 mm 3. Inspect the valve seat with Prussian blue to deter- mine where the valve contacts the seat. To do this, NOTE: Valve seats which are worn or burned can be reworked, provided that correct angle and seat width 4. When seat is properly positioned the width of both seats should be 1.02 - 1.52 mm (0.040 - 0.060 in.). INSPECTION Valve 1. Clean valves thoroughly and discard any burned, bent, warped, and cracked valves. 2. Measure valve stems for wear (Refer to 9 - ENGINE - SPECIFICATIONS). NOTE: Valve stems are chrome plated and should 9 - 2474 ENGINE - 8.3L - SERVICE INFORMATION DR/DH |