1999 Volvo Penta "WT" Models Workshop Manual, Page 185Get this manual
2Caps and springs
3Valve stem oil seals, valves, and componentsPlace them in rack so they can be returned to their original position at assemblyCleaning, Inspection, and Measurement Refer to General Engine Mechanical section in this manualRocker Arm Stud Replacement Tools Required: 5802-01 Valve Rocker Arm Stud Removal 5715 Reamer 0.003 in(0,0762 mm) oversize) 6036 Reamer 0.013 in(0,3302 mm) oversize) 6880 Valve Rocker Arm Stud Installation Valve rocker arm studs that have damaged threads or are loose in cylinder heads should be replacedNew studs are available in 0.003 in(0,0762 mm) and 0.013 in(0,3302 mm) oversize