TM 10-3930-638-24&P 4-2.   ENGINE   MAINTENANCE   (cont) b. CyIinder Head and Valves (cont). STEP LOCATION ITEM ACTION REMARKS INSPECTION AND REPAIR (cont) 7 (cont) NOTE If valve guides (9 and 10) require replacement, perform c below; otherwise proceed to d. c. Valve guides a. Remove Use hydraulic press and press guides from (9 and 10) top,  through  cylinder  head b.  Position On top of cylinder head, Use hydraulic and  install press and push into head until valve guide protrudes 0,875 inch above top of head c. Ream Use A43112 reamer. Ream to 0.3429- 0.3439 inch d. Plugs Inspect Check for damage and looseness. If plugs (11 and 12) are damaged or loose, replace NOTE If plugs (11 and 12) require replacement, perform e, f, and g below; otherwise proceed to h. e. Plugs Remove Drill and pry out (11 and 12) f. Plug (11) Install Until seated, then strike with hammer to expand g. Plug (12) Install To 0.370 inch depth 4-12