ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 WARNING Cleaning solvent is flammable and toxic to eyes, skin, and respiratory tract. Skin/eye protection required.  Avoid repeated/prolonged contact.  Good general ventilation Is normally adequate. WARNING Compressed air used for cleaning can create airborne particles that may enter the eyes.  Pressure will not exceed 30 psig (207 kPa).  Eye protection required. a. Inspect cam followers as follows: (1) Thoroughly clean cam followers in dry cleaning solvent (P-D680) and dry with compressed air. (2) Measure  cam  follower  OD.    New  follower  OD  is  1.245  to  1.246  inches  (31.62  to  31.65  mm).    If  cam follower OD is less than specified, install a new follower. (3) Measure  cam  follower  bore  diameter  in  block  and  determine  if  clearance  is  within  specification,  refer  to paragraph 3-47.3.c (4). (4) Check crown on follower face.  If flat or concave, replace follower and check camshaft lobes for wear, refer to paragraph 3-40.2. (5) Coat cam followers in general purpose grease (630AA) and install in same bore from which removed. b. Inspect valve springs as follows: (1) Inspect valve springs for alignment, wear, and damage. (2) Put springs on a flat surface to see that they are square and parallel. (3) Using spring compression tester, check valve spring tension. (a) Spring free length is approximately 2.125 inches (54 mm).  Free length of springs can differ slightly, but compressed height must be within specification. (b) With a compression of 54 to 62 pounds (240 to 280 N), spring height should be 1.81 inches (46 mm). With a compression of 133 to 135 pounds (590 to 680 N), spring height should be 1.36 inches (34.5 mm). c. Inspect valve rotators as follows: (1) There  is  no  repair  for  valve  rotators.    Whenever  valves  are  replaced  or  reground,  replace  the  valve rotators also. (2) Ensure that valve rotators turn freely in both directions.  Replace if defective. d. Clean, inspect, and measure valves as follows: (1) Thoroughly clean and inspect valves to help determine if they can be restored to a serviceable condition. Replace valves that are burned, cracked, eroded, or chipped. (2) Hold each valve firmly against a soft wire wheel on a bench grinder. (3) Make sure all carbon is removed from valve head, face, and unplated portion of stem. 3-140