Timing Adjustment; Advance Timing Control Checks - Innova 3568 El Manual Del Propietario

6. Adjust the timing light barrel, as needed, to adequately light the timing marks.
7. Note the position of the rotating timing mark
in relation to the reference pointer. See
Figure 4.
■
Compare the readings obtained in step
7 with the manufacturer's specifications
for timing. If the readings are within the
specified tolerance (typically ±2°),
ignition timing is correct.
■
If the readings are not within the
manufacturer's specifications, parts
replacement or timing adjustment MAY
BE necessary.
8. Press the Flash Switch. The timing light will stop flashing.
9. Turn the ignition off and disconnect the timing light from the engine. BE SURE to reconnect any
vacuum hoses, etc., which were disconnected during the timing check.
If the timing light fails to operate or operates erratically, refer to TROUBLESHOOTING to
determine the most likely cause of the problem.

TIMING ADJUSTMENT

Refer to your vehicle's service manual for the proper procedures to adjust engine timing. DO NOT
ATTEMPT TO ADJUST ENGINE TIMING WITHOUT THE MANUFACTURER'S PROCEDURES OR
PECIFICATIONS.

ADVANCE 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
■
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.
Advance timing test procedures vary widely from vehicle to vehicle. The following para-graphs
provide general test procedures for checking mechanical/centrifugal advance and vacuum
advance. ALWAYS make sure initial timing and dwell are correct before checking advance timing.
ALWAYS refer to the service manual for the vehicle under test to obtain the proper timing
procedures and specifications. OBSERVE ALL SAFETY PRECAUTIONS.
Using Your Timing Light
NOTE
NOTE
Fig. 4. Reading Timing Marks
REFERENCE
POINTERS
ROTATING
TIMING MARKS
7