Equus 5568 - INNOVA Pro Digital Timing Light (DIS) - Manual (Page 9)

Operation
5568 7
■ Press Function (F) switch as needed to select voltage/rpm mode. The RPM
Indicator will display when voltage/rpm mode is selected. The LCD display
will show engine rpm. Adjust engine rpm as necessary.
b. Adjust timing light barrel, as needed, to ensure proper illumination of timing
marks.
c. Refer to the vehicle's service manual to check and adjust timing. OBSERVE
ALL SAFETY PRECAUTIONS.
d. Press Flash switch. Timing light will stop flashing.
e. Turn ignition off and disconnect timing light from engine.
f. If disconnected, reconnect vacuum line to distributor.
ADVANCE/RETARD TIMING CONTROL CHECKS
Advance and retard timing controls ensure that ignition occurs at the proper time during
the compres-sion stroke. These controls include mechanical advance, vacuum advance,
vacuum retard, electronic advance, electronic retard, and electronic advance/retard.
Depending on make and model, a vehicle may be equipped with a single timing control
device, or two or more devices may be used in combination.
NOTE: Advance and retard timing test procedures vary widely from vehicle to
vehicle. The following paragraphs provide general test procedures for
checking mechanical advance, mechanical/vacuum advance, and vacuum
retard. ALWAYS make sure initial timing and dwell are correct before
checking advance/retard timing. ALWAYS refer to the service manual for
the vehicle under test to obtain the proper timing procedures and
specifications. OBSERVE ALL SAFETY PRECAUTIONS.
Centrifugal/Mechanical Advance
• Make sure timing light is properly connected as described in TIMING LIGHT
CONNECTION.
• Make sure initial timing is correct. If necessary, prepare engine for advance
timing check as directed by manufacturer's instructions.
a. With timing light directed at timing marks, note position of rotating timing mark
in relation to reference pointer. Reading should indicate initial timing in
accordance with manufacturer's specifications.
b. Adjust engine speed to the specified RPM for advance test.
c. Press Function (F) switch as needed to select advance mode. The ADVANCE
indicator and Advance Degree symbol will display when advance mode is
selected. The LCD display will show "0" degrees advance and engine rpm.