ARMY   TM   9-2815-254-24 AIR  FORCE  TO  35G1-94-2 j. Disconnect rectifier (26) wiring from stator using a soldering gun. Melt the solder (SN60WRAP2) quickly and use long-nosed pliers or equivalent to allow for heat dissipation. k. Disconnect rectifier (26) from brush assembly (28) using a soldering gun. Melt the solder quickly and use long nosed pliers or equivalent to allow for heat dissipation. I. Remove bolts (27) from brush assembly (28). m. Disconnect brush assembly (28) from regulator (29) using a soldering gun. Melt the solder quickly and use long nosed pliers or equivalent to allow for heat dissipation. 3-24.4.     Inspection/Testing, a. Inspect pulley for cracks and wear. b. Inspect fan for wear and damaged vanes. c. Inspect brushes for wear. Normal length is 0.630 in. (16 mm), wear limit is 0.276 in. (7 mm). If below wear limit, replace brush assembly. d. Check brush spring tension. Ensure they hold brush tight against slip ring. If weak, replace brush assembly. e. Inspect/check rotor assembly as follows: (1) (2) (3) (4) Measure OD of slip rings. Standard OD is 1.245 in. (31.6 mm) and useable limit is 1.205 in. (30.6 mm). If OD is less than limit, replace rotor. Check  slip  ring  surface  for  roughness,  oil  stain,  etc.  When  surface  is  rough,  use  abrasive paper  (#400)  to  smooth  roughness.  If  dirty  or  oil  stained,  wipe  clean  with  alcohol  soaked cloth. Set multimeter for ohms and connect to each slip, ring and check for continuity. Standard rotor coil resistance is 12.72 ohms. If there is no continuity, rotor coil is open and rotor must be replaced. Connect multimeter from one slip ring to shaft.    If there is continuity, rotor coil is shorted to ground and rotor must be replaced. Change  2  3-95