Equus 3551 - INNOVA Inductive Timing Light (DIS) - Manual (Page 8)

6
INITIAL (BASE) TIMING CHECK
1. MAKE SURE the timing light is properly
connected as described in TIMING LIGHT
CONNECTION.
2. MAKE SURE the engine has been
properly prepared for the timing check as
described in ENGINE PREPARATION
BEFORE TIMING.
3. Start and run the engine until it reaches its
normal operating temperature.
4. Adjust the engine's idle speed, if
necessary, to conform to manufacturer's
specifications:
5. If using the Model 3555 Advance Timing
Light, MAKE SURE the Advance Control
Knob is rotated fully counterclockwise to
"0".
6. Adjust the Timing Light barrel, as needed,
to adequately light the timing marks.
7. Press the On/Off switch. The Timing Light
will begin flashing. Note the position of the
rotating timing mark in relation to the
reference pointer. See Figure 6.
■ 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 On/Off 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.
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 SPECIFICATIONS.
ADVANCE TIMING CONTROL
CHECKS
The following tests apply to Advance
Timing Light Model 3555 ONLY
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
NOTE
Some ignition systems require that certain
components be disconnected, jumped or
grounded BEFORE ignition timing can be
checked or adjusted to specifications. If
these procedures are not followed, the
checked or adjusted timing will not be
correct. You MUST consult your vehicle's
service manual for the proper procedures
and specifications.
ROTATING
TIMING MARKS
REFERENCE
POINTERS
Fig. 6. Reading Timing Marks
NOTE
If the Timing Light fails to operate or
operates erratically, refer to TROUBLE-
SHOOTING to determine the most likely
cause of the problem.