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4.3
Operating temperature range is −40°F to 158°F (−40°C to 70°C). Humid-
ity specification is 0-95%, non-condensing. Housed in an aluminum
weatherproof enclosure, the CPU-95 Display Module is splash resis-
tant; however, the mounting site should provide as much protection
from inclement weather as is practical. Avoid mounting the LCD
display and keypad in direct sunlight.
5.0 MOUNTING FLYWHEEL GEAR/DRILLING FLYWHEEL
HOLES
5.1
The Altronic CPU-95 system requires a source of angular position
pulses from the engine crankshaft. This can be a flywheel ring gear,
a separately provided gear mounted on the crankshaft or specially
drilled holes in the flywheel. The source of position pulses must
meet the following requirements:
●
Must be ferrous material
●
Diameter of 18" or greater
●
No. of teeth or holes of 180 or greater
●
Maximum run-out referenced to the pickup of .007"
REFER TO FIGURE 2
6.0 MOUNTING THE MAGNETIC PICKUPS
6.1
The system requires two magnetic pickup signals; the angular posi-
tion pulses from the gear or drilled holes and a reset pulse six (6)
degrees ahead of the most advanced firing position desired for no.
1 cylinder
(SEE SECTION
brackets to maintain an air gap of .015" ± .005" with respect to the
rotating gear or flywheel. It is also important for maximum signal
efficiency that the centerline of the rotating part pass through the
center of the pickup -
16
for magnetic pickup dimensions.
7.0 MOUNTING THE FLYWHEEL RESET PIN
7.1
Set the engine with no. 1 cylinder six (6) degrees ahead of the most ad-
vanced firing point. Mark a point on the flywheel directly opposite
the pole piece of the reset magnetic pickup; then rotate the engine
to a position convenient for drilling and tapping the flywheel at
the point marked above. The reset pin should be made from a steel
(magnetic) ¼"-20 bolt or stud.
7.2
Rotate the engine so that the reset pin and magnetic pickup are in-
line and adjust the air gap between the end of the reset pin and the
magnetic pickup at .010" using a feeler gauge.
INSTALLATION INSTRUCTIONS
FIGURE 3
and
for further details.
7.0). The pickups must be mounted to rigid
SEE FIGURE 2
for mounting details and
SEE FIGURE 2
www.altronicinc.com
FIGURE
for details.
3
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