Armature - Mazda 121 Workshop Manual

STARTING SYSTE I
Armatur€
1. Use an ohmmeter to check continuity between the com-
mutator and the core. Beplacethe armature itthere is con-
tinurty.
2. Use an ohmmeter to check continuity between the com-
mutator and the shaft. ReDlacethe armature ilthere iscon-
tinuity.
3. Place the armature on V-blocks, and measure the runout
with a dial indicator.
lfthe runout is not within specification, repair it with a lathe
or replace the armature.
Runout: 0.05mm (0.002 in)
4. Replace the armature it the outel diamele' of lhe comrru'
tator is almos( at or less than the rnlnlmum
5. lt the commutator surface is dirty, wipe it with a cloth; if it
is rough, repair it with a lathe or tine sandpaper'
Gdnd llmlt: 31.4mm (1.23 in)
6. ll the depth of the mold between segments is almost at or
less than the minimum, undercut the grooves to the stan-
dard depth.
Depth : 0.5-0.8mm (0.02-0.03 in)
Minimum: 0.2mm (0.008 in)
G-31