Opel 1900 1973, Service Manual

Page: 53 / 625

1 32 1973 OPEL SERVICE MANUAL
12. Unsolder brushes, if they are worn to a length of
inch or less. Solder new brushes in place. To do
this, hold connecting wire in flat-nosed pliers to
vent
solder
from flowing between wire strands, oth-
erwise the wire strands will become rigid and the
brushes unserviceable. See Figure
Figure 1D-12 Disconnecting Connector
Figure 1 D-l 5 Soldering New Brushes
Note brush wire installation of correct assembly. See
16.
Figure Removing
9. Unsolder diode connections and winding
ends. Clamp pliers on wire to transfer heat away
from diodes. Unsolder quickly using a very hot sol-
dering iron, as the diodes are very sensitive to heat.
See Figure
Figure D-l 6 Brush Wire Installation
Figure 1 D-l 4 Unsoldering Connections
10. Remove assembly from housing.
Remove two screws and negative diode support.
13. Test rotor windings and slip rings for a ground,
using a test light or an ohmmeter. Test light should
not light; ohmmeter should read near infinite resist-
ance end of scale. See Figure
14. Test rotor windings for a short by connecting an
ohmmeter between the two slip rings. Ohmmeter
should read between 4.0 and 4.4 ohms. See Figure
18.
15.
Test
windings for a ground, using a test
light or an ohmmeter. Test light should not light;
ohmmeter should read near infinite resistance end of
scale. See Figure