37- 1- 613 Page 49
BEARING PRESS PLATE
JACK SCREWS
FIGURE 7- 24
tight against the rotor. Bend the ear of the
lockwasher (27) into the slot of the nut (26) holding
the pinion. Oil the bearings generously.
The final check to be made for running clearances
is dividing the interlobe clearance of the rotors to
prevent metal- to- metal contact. This is referred to as
“TIMING OF ROTORS”
and is accomplished in the
following five steps.
27. Install the gear on the hub (FIGURE 7 - 28), which
is a slip fit. If gear teeth were marked at
disassembly, line up these marks. New gears
are not marked and should be positioned so
tapped holes
in the hub are centered with holes in the gear to
allow radial movement of the gear for timing.
Tighten the
“Nylok” screws (41) against the flat
washers (42) (always use new washers) just tight
enough to allow the gear to slip radially on the hub.
Mount an indicator and button bracket as shown
in FIGURE 28, page 36. In order to accurately
follow the next four steps in timing, the indicator
must be mounted in a clockwise position from the
bracket. The gear has a 3/8- 16 tapped hole for
indicator support. When the indicator is mounted,
hold the gear from rotating and with a wrench in
one of the hub retainer screws, move the shaft in
a clockwise direction until all slack is taken out of
the gears and rotors to give a metal -
-
- to -
-
- metal
contact. To prepare for the first reading, set the
indicator at zero.
28.
FINDING SMALLEST MINUS READING
--
FIGURE 7-29, page 4 7. Hold the gear under
clockwise pressure to maintain metal -
-
- to -
-
- metal
contact. Rotate the shaft counterclockwise t
wo
complete revolutions
with a wrench. (Do not
rotate by moving the gear.) If at any time the
indicator hand moves to the plus side, reset at
zero, and again rotate two complete revolutions.
Notice the place of the smallest reading (this is the
smallest number of thousandths from zero, not
the smallest figure on the indicator dial). Continue
rotation until the smallest reading is again reached
and reset the indicator at zero. This is the closest
clearance of rotors in this direction of rotation. If
the indicator pointer flutters at any time during
rotation, check for burrs or dirt on the rotors or
gear teeth.
HOLD
BUTTON BRACKET
FIGURE 7- 25
FIGURE 7- 26
