2) Electric Starter Single Parts Check - Rotax 912 Series Maintenance Manual

14.1.2)
Effectivity: 912 Series
AIRCRAFT ENGINES
MAINTENANCE MANUAL II
Electric starter single parts check
See fig. 114, 115 and 116.
After disassembly of starter, check the following parts:
Armature
Clean commutator, check for straightness, check visually, and if need be,
slightly machine and undercut segments U (see fig. 131). The insulation
should start 0,5 mm (0,02 in.) below face of segments.
WARNING: During this machining process material particles are set
free and could possibly be inhaled.
Check armature at 12 or 24 Volt with test lamp between commutator I and
iron core O for connection to ground. If the lamp lights up, renew armature.
Check windings for interruption, utilizing 2
or 4 Volt supply and interconnected
amperemeter (measuring range 60 A) (see
fig. 116). The armature has to be
renewed if the ampere readings
differ esentially between single
segments. If the armature shows
heavy signs of overheating, re-
new it.
Check ball bearing P 6002 Z. At
renewal, fit it with closed side towards armature (open side { facing
outward). Inspect teeth } and radial clearance of armature shaft in rotor
support E.
Bearings
Check bearing sleeve q, renew rotor support as necessary.
Carbon brushes
Carbon brushes w must be freely
moving in their respective guides
e. Renew brushes that are too
short (minimum 8 mm (0,32 in)).
Check spring pressure and re-
new any brush spring r which
shows evidence of heat dam-
age. Check isolating sleeves t
of the plus-pole carbon brush y,
renew as required.
O-rings
-rings u and oil seal i at overhaul of electric starter.
Renew all
O
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Initial issue, Jan. 01/2002
7
fig. 115
8
fig. 116
page 81