TM 10-3930-664-24 10.  Remove retainer (26), five rollers (27),  starter pinion (28) and washer (29) from magnetic switch (23). 11.  Remove spring (30).  Remove and discard seal (31). B. CLEANTNG Clean starter motor components in accordance with paragraph 1-24. C. INSPECTION 1. Inspect  starter motor components in accordance with paragraph 1-24. 2. Inspect armature commutator surface for burned spots.  Burning indicates an open circuit.  Replace armature if surface is damaged. 3. Using dial indicator, check commutator run-out as shown in figure.  Service limit is 0.4 mm. 4. Using caliper, measure O.D.  of armature commutator surface.  Service limit is 35 mm. 5. Measure armature segment commutator undercut depth.  Service limit is 0.2 mm. 3-98