Brodie BiRotor BA-89, Installation And Operation Manual

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4.6 Timing Gear Adjustment
1. Loosen the nut (item 7) on the large timing
gear (item 8) and with a feeler gauge,
carefully centralize lobe of the 3T rotor in a
flute of the 4T rotor. This may be done
through the inlet and outlet of the unit.
2. Using a small piece of rubber between the
timing gears, tighten the jam nut (item 7).
Remove the feeler gauge and check for
freeness of operation. If the rotors contact
one another the timing operation must be
repeated. If the rotors were damaged, it will
sometimes be found that all of the high spots
were not removed. In such cases, it is
necessary to find these spots and remove
them.
4.7 Adjusting End Clearance
The following is applicable if clearance between
the rotors and end plate requires adjustment.
1. Loosen the adjustment nuts (item 15) on the
front rotor shaft and tighten the adjustment
screws (item 24) of on the outlet side pushing
the rotors against the front plate
2. Determine the clearance between the rotors
and rear end cover with a feeler gauge. For
example .0008.
3. Adjust the rotors to onehalf the measured
clearance or .0004 of the above example and
adjust nuts (items 15 & 7) and adjustment
screws (item 24) accordingly.
4.8 Completion of Measuring Unit
Reassembly
1. Lower the assembled measuring unit onto the
outlet housing (item 15) and lightly oil the
ORing (item 12).
2. Position ORing (item 12) and inlet housing
(item 3) into place and secure with screws
and nuts (items 10 & 11).
3. Rotate the coupling tube on the pinion shaft
assembly of the counter base plate assembly
(item 4) until the drive pin is positioned the
same as the slot of the coupling jaw on the
driven gear (item 21, Figure 62).
4. Reinstall other accessories.