Chevrolet 70 1969 Series, Shop Manual

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ENGINE ELECTRICAL 6Y-17
Slip Ring End Frame Bearing Replacement
The roller bearing assembly in slip ring end frame
should be replaced if its grease supply is exhausted. No
attem pt should be made to re-lubricate and re-use the
bearing.
1. To remove bearing assembly from slip ring end frame
use arbor press and a tube or shaft which just fits ins­
ide bore without interference. Support end frame as­
sembly and press from outer side toward inner side of
end frame.
2. Use a flat plate to press new bearing into end frame
(fig. 9). Press from outer side of end frame while sup­
porting end frame assembly. Use extreme care to
avoid cocking the bearing or otherwise placing undue
stress on bearing. Rear (outer) end of bearing must be
pressed in flush with outer surface of end frame as­
sembly.
3. Saturate felt seal with S.A.E. No. 20 engine oil, and
install seal and steel retainer at inner end of bearing
assembly.
Heat Sink Replacement
H eat sink and positive diodes can be replaced as an as­
sembly after generator is separated into major com po­
nents as previously directed in “ Generator Disassembly."
The following procedure covers replacing heat sink assem ­
bly on slip ring end frame. Refer to exploded view of
components in figure 10.
1. If brush holder has not been removed from end
frame, loosen screw which holds strap (fig. 14) at
brush holder so lower end of strap can be disengaged
from junction terminal without bending strap. Also
disengage negative diode leads from the three junction
terminals if not previously done.
2. Remove “ BAT” and “ G R D " terminals and respective
washers and insulators from end frame and heat sink.
3. Remove heat sink from end frame and the three insu­
lating washers shown in Figure 10.
4. With diodes and junction terminals installed in heat
F ig u re 1 0 — H e a t S in k a n d R e la te d P arts D is a s s e m b le d
F ig u re 9 — In s ta llin g B e a r in g in S lip R in g E n d F ra m e
1. Remove three screws which attach retainer and seal
assembly (2) to end frame (7). Remove retainer and
gasket (3), then press bearing assembly (4) out of end
frame. Remove bearing shield (5) from bearing recess
in end frame.
2. Inspect bearing assembly. If bearing is in good condi­
tion it may be re-used, otherwise install new bearing
assembly.
3. Use Delco-Remy lubricant (No. 1948791) or equiv­
alent to lubricate bearing. Place shield (5) in recess in
drive end frame (7) and press bearing (4) into place in
recess. Lubricate cavity in bearing and recess must
not be packed solid with lubricant, but should be only
one-quarter filled.
C A U T IO N : Overfilling b e a rin g recess m a y cause
b e a rin g to overheat. U se only lubricant of the
type specified above.
4. Install bearing retainer and seal assembly and gasket
(2 and 3).
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L