15-50 ELECTRICAL SYSTEM
Electric Starter System
Commutator Cleaning and Inspection
Smooth the commutator surface [A] if necessary with fine
emery cloth (#400 ∼ 500) [B], and clean out the grooves.
Measure the diameter [A] of the commutator [B].
Replace the starter motor with a new one if the commu-
tator diameter is less than the service limit.
28 mm (1.10 in.)
27 mm (1.06 in.)
Using the × 1 Ω hand tester range, measure the resis-
tance between any two commutator segments [A].
If there is a high resistance or no reading (∞) between any
two segments, a winding is open and the starter motor
must be replaced.
Using the highest hand tester range, measure the resis-
tance between the segments and the shaft [B].
If there is any reading at all, the armature has a short and
the starter motor must be replaced.
Even if the foregoing checks show the armature to be
good, it may be defective in some manner not readily
detectable with the hand tester. If all other starter motor
and starter motor circuit components check good, but
the starter motor still does not turn over or only turns
over weakly, replace the starter motor with a new one.