TM  10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) b.  Cylinder  Head  and  Valves  (cont). STEP LOCATION ITEM ACTION REMARKS VALVES  AND  VALVE  SEAT  REFACING  (cont) 13 NOTE (cont) After valves and valve seat are ground, valve recession and protrus- ion must be rechecked (step 9a and d, respectively, of inspection and repair). INSTALLATION 14 Cylinder  head, Valves (6 and 7) a. Lubricate Use No. 30 oil (8)  bottom valve  stems b. Install In  proper  bore 15 Cylinder  head, a. Spring seat (4) Install (8)  top b. Valve spring (3) Install With closed damping coil end towards  cylinder  head c. Spring retainer (2) Install d. Valve stem seal (5) Install Use  valve  spring  compressor  tool and compress spring. Install in lower  stem  groove e. Two valve keepers (1) Install On top valve stem groove. Remove valve  spring  compressor  tool  care fully and tap valve stem to seat valve keepers 4-19