ARMY TM 9-2815-255-24
AIR FORCE TO 38G1-95-2
MARINE CORPS TM 2815-24/4
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.
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.
Inspect cam followers as follows:
Thoroughly clean cam followers in dry cleaning solvent (P-D680) and dry with compressed air.
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.
Measure cam follower bore diameter in block and determine if clearance is within specification, refer to
paragraph 3-47.3.c (4).
Check crown on follower face. If flat or concave, replace follower and check camshaft lobes for wear, refer
to paragraph 3-40.2.
Coat cam followers in general purpose grease (630AA) and install in same bore from which removed.
Inspect valve springs as follows:
Inspect valve springs for alignment, wear, and damage.
Put springs on a flat surface to see that they are square and parallel.
Using spring compression tester, check valve spring tension.
Spring free length is approximately 2.125 inches (54 mm). Free length of springs can differ slightly,
but compressed height must be within specification.
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
Inspect valve rotators as follows:
There is no repair for valve rotators. Whenever valves are replaced or reground, replace the valve
Ensure that valve rotators turn freely in both directions. Replace if defective.
Clean, inspect, and measure valves as follows:
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.
Hold each valve firmly against a soft wire wheel on a bench grinder.
Make sure all carbon is removed from valve head, face, and unplated portion of stem.