3. Checking and Securing Flats and Screws
The HQ Sixteen has been designed using flats and special screws so that loop lift timing cannot slip.
Tools required: (2.0 and 2.5mm handle allen)
Pitman
Pitman Crank
Check the following locations, making sure that the first
screw of a timed component has been fixed firmly on the
respective flats on shafts.
Note: The screws are generally positioned 120 degrees
apart. When the first screw (Position 1) has been located
and tightened on a flat, the second screw is then tightened,
compounding the tightness of the first screw, thus securing
and assuring that timing will not change. (see figure 3.1)
Note: See torque specifications chart in the specification
section for torque values.
Figure 3.1
Thrust Collar
NOTE: The thrust collar flat is inclined. The first screw
(shown in Figure 3.2) must be provisionally tightened. The
second screw is then fully tightened. The first screw is then
fully tightened. It is important to check that this collar
tightening procedure did not create a tight arm shaft
condition. If so, readjust the collar again.
Figure 3.2
Main Timing Pulley
FIRST SCREW, FIRST POSITION RULE
:
The first screw or first position is ALWAYS located
120° apart in the direction of rotation from the second
screw or second position.
Figure 3.3
Figure 3.4
Transmission shaft and Gear
3.0
