ST–7 STARTING SYSTEM – STARTER Ohmmeter No Continuity P10585 2. INSPECT COMMUTATOR FOR GROUND Using an ohmmeter, check that there is no continuity between the commutator and armature coil core. If there is continuity, replace the armature. Commutator 1. INSPECT COMMUTATOR FOR DIRTY AND BURNT SURFACE If the surface is dirty or burnt, correct it with sandpaper (No.400) or on a lathe. P10586 2. INSPECT COMMUTATOR CIRCLE RUNOUT (a) Place the commutator on V–blocks. (b) Using a dial gauge, measure the circle runout. Maximum circle runout: 0.05 mm (0.0020 in.) If the circle runout is greater than maximum, correct it on a lathe. P10587 3. INSPECT COMMUTATOR DIAMETER Using a vernier caliper, measure the commutator diameter. Standard diameter: 30.0 mm (1.181 in.) Minimum diameter: 29.0 mm (1.412 in.) If the diameter is less than minimum, replace the armature. ST0040 4. INSPECT UNDERCUT DEPTH Check that the undercut depth is clean and free of foreign materials. Smooth out the edge. Standard undercut depth: 0.6 mm (0.024 in.) Minimum undercut depth: 0.2 mm (0.008 in.) If the undercut depth is less than minimum, correct it with a hacksaw blade.