Equus 3551 - INNOVA Inductive Timing Light (DIS) - Manual (Page 6)

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1. Xenon Bulb — Used to illuminate timing
marks for checking timing.
2. Swiveling Head — Contains the xenon
bulb. Rotates over approximately 90
° to
allow for easy illumination of timing marks in
hard to reach locations.
3. Control Panel — Contains the controls
necessary to operate the Timing Light.
Specific controls vary between models.
Refer to the appropriate paragraph for a
description of control panel functions.
4. Inductive Pickup Leads — Detachable
leads assembly connects timing light to
battery and ignition system:
■ Red Battery Clip — Connects to
battery positive (+) terminal.
■ Black Battery Clip — Connects to
battery negative (-) terminal or bare
metal chassis ground.
■ Inductive Pickup Clip — Clamps
around No. 1 spark plug cable.
Operating controls for the Model 3551 Timing
Light are shown in Figure 2.
1. On/Off Switch — Press to turn timing
light on. Press again to turn timing light
off.
Operating controls for the Model 3555 Timing
Light are shown in Figure 3.
1. On/Off Switch — Press to turn timing
light on. Press again to turn timing light
off.
2. Advance Control Knob — Selects timing
light advance setting from 0
° to 60 ° .
TIMING
LIGHT
DIS • CONVENTIONAL
1
Fig. 2 Model 3551 Controls
0
5
10
15
20
25
30
35
40
45
50
55
60
TIMING
LIGHT
A D V A N C E
1
2
Fig. 3 Model 3555 Controls
BEFORE YOU BEGIN
Make a thorough check before starting any test
procedure and fix any known mechanical
problems before performing any test. Loose or
damaged hoses, wiring, or electrical connectors
are often responsible for poor engine performance.
Refer to your vehicle’s service manual for
proper connection of vacuum hoses, electrical
wiring, and wiring harness connectors. Check
the following areas:
■ All fluid levels
■ Spark plugs and spark plug wires
■ Air cleaner
■ Vacuum hoses
■ Belts
■ Electrical wiring
■ Electrical connectors
USING YOUR TIMING LIGHT