Initial Timing Check (Using No. 1 Cylinder); Advance/Retard Timing Control Checks - Innova 5568 Manual Del Propietário

Operation

INITIAL TIMING CHECK (USING NO. 1 CYLINDER)

•
ALWAYS refer to the manufacturer's test procedures and specifications when performing timing
check. Timing procedures vary from vehicle to vehicle. Refer to the Vehicle Emission Control
Label or service manual for the vehicle under test.
NOTE: Some vehicles equipped with computerized engine control systems may be
designated as "NON-ADJUSTABLE".
•
Make sure timing light is properly connected as described in TIMING LIGHT CONNECTION.
•
MAKE SURE the proper operating mode is selected (2- cycle (DIS) or 4-cycle).
•
If vehicle is equipped with distributor points, check dwell as described in CHECKING DWELL
ANGLE, and adjust if necessary BEFORE performing timing check.
a. Start and run engine until it reaches normal operating temperature.
■
The Flash Indicator will blink to indicate the timing light is operating.
■
Press both ignition system selection switches SIMULTANEOUSLY to select either 2-cycle
(DIS) or 4-cycle mode. The Ignition Mode Symbol will display the selected mode.
■
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 compression
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.
6