The first test we carried out on the starter motor was a visual test to check for any burning, overheating, poling and physical damage. There was none of this except for very minor scratching.
Testing if there is a short circuit between the commutator segments and the armature core. I placed the multimeter set to Ohms on the two. The reading was infinite telling me there is no short circuit and that is what it was supposed to be.
Checking continuity between the comutator segments. Place one probe one of the segments and with the other move it around the others checking if there is a break on any of them. There was continuity in all of the segments.
Measuring the commutator I should have gotten in the range of 26.8 and 31mm. I got 31mm. The mica undercut should have been between 0.7 and 1mm. I got a measurement of 1mm.
Testing for runout on the armature shaft I placed the armature between two 'V' blocks. I rotated the armature 360 degrees while reading the dial test indicator (it is set up on the armature core). The runout should be no more than 0.2mm. I got a maximum reading of 0.1mm.
We also tested continuity and grounding in the field coils.
The brushes should be no less than 5mm. All of the brushes were greater than the specified length.
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