TM 10-3930-660-34 3-7. CYLINDER HEAD ASSEMBLY - REPLACE/REPAIR (Cont’d) 3. REMOVE INTAKE AND EXHAUST VALVES (8 AND 9) AND DISCARD COLLETS (11). NOTE The following valve removal procedure is applicable to all 12 valves. a. Compress valve spring (10) using a valve spring compressor. b. Remove and discard collet (11). c. Release spring pressure and remove compressor. d. Remove spring retainer (12) and spring (10). e. Remove intake and exhaust valves (8 and 9). f. Remove and discard valve stem seals (13). CLEANING NOTE If cylinder head and valve components are not to be assembled right away, lightly oil and wrap the parts after inspection and before storing. 1. SEE CLEANING INSTRUCTIONS, PARA. 2. POLISH CYLINDER HEAD GASKET SURFACES WITH SCOTCH-BRITE R PADS. 3. CLEAN CARBON FROM VALVES AND REMARK ACCORDING TO LOCATION IN HEAD. a. Clean valve heads with a soft wire wheel. b. Clean valve stems with crocus cloth. c. Wash valves with fuel oil and wipe dry with d. Remark valves according to their location in the cyclinder head. WARNING P-D-680 (Type II) is a flammable solvent that is potentially dangerous to personnel. Keep away from heat, sparks or open flame. Flashpoint of solvent is 138°F. Use only in a well ventilated area .Inhaling vapors over a period of time can cause headache and drowsiness. Use gloves to prevent irritation or inflammation of the skin. Solvent absorbed through the skin can result in internal disorders. If contact occurs, wash the affected area with water for 15 minutes For eyes, flush with water and then seek immediate medical attention. WARNING Eye shields must be worn when cleaning with a wire brush. Flying rust and metal particles may cause injury to personnel. 4. CLEAN VALVE SPRINGS WITH DRY CLEANING SOLVENT AND DRY THOROUGHLY WITH COMPRESSED AIR. INSPECTION 1. INSPECT CYLINDER HEAD ASSEMBLY. a. Check for uneven surfaces and warpage of cylinder head. b. Place a straightedge along length of cylinder head mating surface and check for distortion. c. Measure gap under straightedge in areas indicated in chart on page 3-39. clean lint free wiping rag. 3-38