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SPRINGS/SEALS-VALVE DIAGNOSIS AND TESTING VALVE SPRING TESTING The valve springs should be tested whenever removed for inspection, reconditioning, or replace- 1. Obtain specifications for spring tension at specified spring length (Refer to 9 - ENGINE - SPECIFICA- 2. Turn table of Special Tool C-647 (2) until the sur- face is in line with the spring length specification 3. Place spring over stud on the table and lift com- pressing lever to set tone device. 4. Pull on torque wrench (beam or dial type) until ping is heard. Take reading on torque wrench at this 5. Compare reading to the specification. Discard the springs that do not meet specifications. STANDARD PROCEDURE - VALVE SPRING/SEAL SERVICE IN-CAR 1. Disconnect negative battery cable. 2. Disconnect secondary ignition wires and remove spark plugs. 3. Remove cylinder head cover(s) (Refer to 9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD COVER(S) - REMOVAL). 4. Rotate crankshaft until No. 1 piston is at TDC on compression stroke. 5. Remove rocker arms with pivots. The rocker arms should not be disturbed and remain on pivot block. 6. With air hose attached to spark plug adapter installed in No. 1 spark plug hole, apply 620.5 - CAUTION: Place a suitable shop towel around the 7. Using valve spring compressor MD998772-A with insert 6716-A (1), compress valve spring (2) and 8. Release valve spring compressor (1). 9. Remove valve spring and retainer. 10. Remove valve seal. NOTE: Black valve seals are intake. Brown valve seals are exhaust. 9 - 2470 ENGINE - 8.3L - SERVICE INFORMATION DR/DH |