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TM 5-2420-222-34
7-2. ENGINE STARTER REPAIR (Con’t).
b.
CLEANING AND INSPECTION
WARNING
Cleaning compound, trichlorotrifluoroethane, for electrical parts is toxic and
flammable, and reacts violently with aluminum, titanium, barium, lithium,
samarium, sodium, and potassium. Always wear protective goggles and rubber
gloves, and use only in a well-ventilated area. DO NOT wear Jewelry while using
cleaning compound. Avoid contact with skin, eyes, and clothes, and DO NOT
breathe vapors. Cleaning compound fumes or vapors can take the place of air and
may become a cancer producing agent. DO NOT use near open flame or excessive
heat. The compound’s boiling point is 114F (46C). If you become dizzy while
using cleaning compound, immediately get fresh air and medical help. If
compound contacts eyes, immediately wash your eyes with water and get medical
aid.
1.
Clean all metal and nonmetallic parts except ball bearings with trichlorotrifluoroethane and clean rags. Dry parts
thoroughly with clean dry rags.
WARNING
Compressed air used for cleaning or drying purposes or for clearing restrictions,
should never exceed 30 psi (207 kPa). Wear protective clothing (goggles/shield,
gloves, etc.) and use caution to avoid injury.
2.
Using fine abrasive paper, clean surface of commutator on armature. Remove loose particles with compressed
air.
3.
Inspect all metal parts for cracks, breaks, burns, wear, and abnormal bends. Replace defective parts.
4.
Inspect all threaded parts for damaged threads.
5.
Check wicks for fraying or wear.
6.
Inspect two brush springs for discoloration. Using portable spring resiliency tester, check spring for weakness.
Spring tension must be at least 35 oz (9.7 N). Replace both brush springs if either spring does not meet
specification.
7.
Inspect four brushes for cracks and breaks. Measure length of brushes. Brushes must be at least Y6 in. long.
8.
Inspect drive housing sleeve bushing for looseness in bore, wear, scoring, and grooves. Using telescoping gages,
measure inside diameter of sleeve bushing in three places. Correct inside diameter is 0.499-0.511 in. (12.675-
12.979 mm).
9.
Inspect electrical end bell sleeve bushing for looseness in bore, wear, scoring, and grooves. Using telescoping
gages, measure inside diameter of sleeve bushing. Correct inside diameter is 0.563-0.573 in. (14.300-14.554
mm).
10.
Using outside micrometer caliper, measure armature end bushing contact area in three places. Difference
between largest armature end bushing inside diameter and smallest armature end shaft outside diameter must not
exceed 0.017 in. (0.432 mm) oil clearance.
11.
Using outside micrometer caliper, measure electrical end bell bushing contact area in three places. Difference
between largest electrical end bell bushing inside diameter and smallest electrical end bell shaft outside diameter
must not exceed 0.016 in. (0.406 mm) oil clearance.
7-20
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