Bell System Practices Plant Series Adjustments page 4

SECTION 573-127-700
2. REQUIREMENTS AND ADJUSTMENTS
2. 01 Cam Shafts (28B Unit)
NOTE 1: THE FOLLOWING REQUIREMENTS APPLY TO BOTH THE DISTRIBUTOR AND SENSING CAM SLEEVES.
THESE MECHANISMS SHOULD NOT BE DISTURBED UNLESS THERE IS REASON TO BELIEVE THE REQUIREMENTS
ARE NOT MET.
CAM-SLEEVE ENDPLAY
NOTE 2: THE ADJUSTMENT IS TO BE MADE
PRIOR TO ASSEMBLY OF DRIVE GEAR TO
CLUTCH DRUM.
REQUIREMENT
MIN. SOME
MAX. 0.010 INCH
PLAY BETWEEN CAM SLEEVES AND SPACERS.
TO ADJUST
REMOVE CLUTCH DRUM DRIVE GEAR
AND LOOSEN DRUM MOUNTING SCREW.
RELEASE CLUTCH AND POSITION CAM
SLEEVE. TIGHTEN DRUM MOUNTING
SCREW AND REINSTALL DRIVE GEAR.
BALL BEARING
Page 4
DRUM MOUNTING
SCREW
BEARING
RETAINER
BEARING RETAINER
MOUNTING SCREW
DRUM MOUNTING
SCREW
CAM SLEEVE
(C) IDLER GEAR ASSEMBLY
REQUIREMENT
CLEARANCE BETWEEN IDLER
GEAR AND SENSING SHAFT
GEAR,AND BETWEEN IDLER GEAR
AND DISTRIBUTOR SHAFT GEAR
AT POINT WHERE BACKLASH IS
MINIMUM:
MIN. SOME
MAX. 0.003 INCH.
TO ADJUST
POSITION IDLER GEAR ASSEMBLY
WITH LOCKNUT LOOSENED.
RECHECK GEAR PLAY THROUGH
ONE REVOLUTION OF GEARS.
(B) CAM-SHAFT BEARING RETAINER
REQUIREMENT
WHEN MOUNTING SHAFT ASSEMBLY, BEARING
SHALL SEAT PROPERLY. (NO CLEARANCE PER­
MISSIBLE BETWEEN BEARING AND MOUNTING
SURFACE.)
TO ADJUST
ROTATE BEARING RETAINER 180 DEGREES AND
POSITION BY PUSHING DOWNWARD FIRMLY.
DRIVE
DRUM
GEAR