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INSPECTION Measure valve stems for wear. If wear exceeds 0.051 mm (0.002 in.), replace the valve. Measure valve stem guide clearance as follows: valve stem and install valve (Fig. 17). The special (2) Attach dial indicator Tool C-3339 to cylinder head and set it at right angles to valve stem being (3) Move valve to and from the indicator. The total dial indicator reading should not exceed 0.432 mm INSTALLATION (1) Clean valves thoroughly. Discard burned, warped and cracked valves. (2) Remove carbon and varnish deposits from inside of valve guides with a reliable guide cleaner. (3) Measure valve stems for wear. If wear exceeds 0.051 mm (0.002 inch), replace the valve. (4) Coat valve stems with lubrication oil and insert them in cylinder head. (5) If valves or seats are reground, check valve stem height. If valve is too long, replace cylinder (6) Install new seals on all valve guides. Install valve springs and valve retainers. (7) Compress valve springs with Valve Spring Compressor Tool MD-998772A and adapter 6716A, (8) Install cylinder head (Refer to 9 - ENGINE/ CYLINDER HEAD - INSTALLATION). Fig. 16 Testing Valve Spring for Compressed Length 1 - TORQUE WRENCH Fig. 17 Positioning Valve with Tool C-3973 1 - VALVE Fig. 18 Measuring Valve Guide Wear 1 - VALVE 9 - 88 ENGINE 3.9L AN INTAKE/EXHAUST VALVES & SEATS (Continued) |