5 - 28ENGVALVES AND VALVE SPRINGS a. Apply a coarse lapping compound a to thevalve face.CAUTION:_Do not let the lapping compound enter thegap between the valve stem and the valveguide.b. Apply molybdenum disulfide oil onto thevalve stem.c. Install the valve into the cylinder head.d. Turn the valve until the valve face and valveseat are evenly polished, then clean off allof the lapping compound.NOTE:_For the best lapping results, lightly tap thevalve seat while rotating the valve back andforth between your hands.e. Apply a fine lapping compound to the valveface and repeat the above steps.f. After every lapping procedure, be sure toclean off all of the lapping compound fromthe valve face and valve seat.g. Apply Mechanic’s blueing dye (Dykem) ontothe valve face.h. Install the valve into the cylinder head.i. Press the valve through the valve guide andonto the valve seat to make a clear impres-sion.j. Measure the valve seat width a again. Ifthe valve seat width is out of specification,reface and lap the valve seat. EAS00241CHECKING THE VALVE SPRINGSThe following procedure applies to all of thevalve springs.1. Measure:• valve spring free length aOut of specification → Replace the valvespring.Valve spring free lengthIntake valve spring38.9 mm (1.53 in)Exhaust valve spring40.67 mm (1.60 in)
