Rotor; Brush Holder; Replacing The Rectifier Diodes - Volvo 164 1969 Service Manual

Rotor
Check that the sli p rings are not dirty or burnt.
Check the winding for breakage or damaged in-
sulation .
Measure the resistance between the slip rings, see
Fig. 3-13. At 25° C
(7r
F) the resistance shou ld be
5.2
±
0.2 o h ms.
If the sli p ringiS are dirty, dean them carefully with
a cloth miOistened' in trich loroethylene. The slip rings
can a lso be po li shed dean with fine sandpaper.
If the wind ing is damaged, the entire rotor must be
rep laced.
Check the bearing,s (the bearing,s should always be
replaced when the a lternator is dismantled ).
Fig. 3-14. Checking the brush holder
Brush Holder
Connect the test lamp between the brushes. The lamp
must not light.
Connect the test lamp between the DF-connection and
u
+"
brush. The lamp should g:ive a steady light even
if the brush or the connecting, lead is moved, see
Fig. 3-14. Connect the testlamp between the brush
holder frame and U _ " brush. The lamp should give
a steady light even if the brush or the connecting
lead is moved.
If the brush holder does not fulfil the above require-
ments, or if the brush length is less tha.n 5 mm {3/16"},
the holder should be replaced.
Replacing the rectifier diodes
Mark the cables connecting the stator to the diodes.
Solder loose the cables.
Place the new diode holder exactly in the same po-
sition occupied by the old one.
Hold the outgoing cable of the diode with a pair of
flat pliers. (This is to conduct heat from the soldering
point in order not to damage the new diode.)
3 :6
Solder on the diodes, see Fig. 3-15.
N.B. The entire
u
+"
or
U _"
diode holder must be
rep laced even if only one diode is faulty.
Use a well-heated so ldering iron of minimum
100 W when soldering.
Never change the location of the fwo diode
holders.
The positive diode holder is insulated from the
material by means of insulating washers and
sleeves and its diodes are marked with red ink.
The negative diode holder is not insulated and
its d iodes are marked with black ink.
Fig. 3·1 5. Soldering on the diodes
REPLACING THE BEARINGS
Drive end bea,ring
REMOVING
VOLVO
103016
Place the rotor in a vice provided w ith soft jaws.
Pull the bearing off with a daw puller, Fig. 3-l6.
FITTING
Place the support plate on the rotor shaft with the
three elevations facing the rotor winding.
Press on the bearing. with the help of a tubular
sleeve which presses on the inner ring of the bearing,
see Fig. 3-17.
Slip end bearing
REMO VING
Place the rotor in a vice provided with soft jaws..