Jegs 555-40750 User manual
Digital Inductive Timing Light
User Guide
555-40750
9-16 Volt
Technical Terms
•
Timing is given in “linear measurement” or
“degrees” relative to the “Top Dead Center”
(T.D.C.) of the movement of the piston.
(See Figure 1)
• B.T.D.C. (Before Top Dead Center):When the
timing is “advanced”, the spark will occur
before the piston reaches the top of the
engine cylinder ensuring that the full power of
the explosion is obtained.
•
T.D.C. (Top Dead Center):The piston is at its
highest point in the cylinder.
• A.T.D.C. (After Top Dead Center): When the
timing is “retarded”, the spark occurs after the
piston has started to go down in the cylinder.
1
T.D.C.T.D.C.T.D.C.
Pulley
Timing Marks
Pointer
Before Top
Dead Center
B.T.D.C
Figure 01
T.D.C A.D.C
Top
Dead Center
After
Dead Center
Introduction:
Contents
1.
For checking and setting ignition timing on
automotive, agricultural and marine engines.
2. For use on 9-16 volt systems.
3. Reverse polarity protected.
4. Accurate to 8,000rpm.
5. 20 in. long durable power leads.
6. Impact resistant housing.
7. On/off trigger switch.
8.
Bright linear Xenon ash tube for daylight use.
9. Focused lens provides concentrated light.
Figure 02
2
Introduction:
Operation Buttons
1. R/A Button:
Switch speed and ignition advance angle
to be displayed.
2. 4/2 Button:
Switch from 4-stroke and 2-stroke.
3. + Button:
Short press to increase the ignition
advance angle by 0.1 and long press to
increase it by 1.
4. Button:
Short press to reduce the ignition
advance angle by 0.1 and a long press to
reduce it by 1.
Figure 03
A
B
C
A. Display Area: Display ignition advance
angle or engine speed.
B. Indicator Area: Indicates that the product is
in a certain functional state.
C. Operation Buttons (See below descriptions)
1. Clamp the inductive pick-up around the No.1
Spark Plug wire. Make sure the arrow on
it is facing towards the spark plug. Do not
allow the inductive pick-up to touch the exhaust
manifold or surrounding parts as these areas
become extremely hot and will damage the
inductive pick-up.
2.
Connect the RED clamp to the positive(+)
battery terminal.
3. Connect the BLACK clamp to a secure engine
ground such as the alternator bracket or the
engine block. For safety reasons, do not use
the negative(-) battery terminal or fuel system
components as a ground connection point.
Black
Red
Battery
+
Distributor
No.1 Spark Plug
Lead Connections Engine Block
or Chassis
Induction
Pick-Up
Arrow Toward
Spark Plug
Figure 04
Operating Instuctions
Troubleshooting
Fault Possible Causes Solution
No Flash 1. Battery clamps are reversed.
2. Poor connection of battery clamps.
1. Swap the clamps over.
2. Make sure the clamp connections are clean
1. Inductive pick-up wire lying too
close to the other spark plug wires.
1. Move the pick-up wire away from the
other wires.
Light Flashes
Intermittently
Timing Adjustment
PLEASE NOTE: Before adjusting the timing, the
“dwell angle” or “gap” should be adjusted on
vehicles tted with contact breaker points.
1.
Check manufacturers specications for correct-
timing for engine being serviced.
2. Loosen the distributor clamp bolt so that the-
distributor can be rotated in either direction.
3.
Locate engine timing mark and use a rag to-
clean all grease and dirt from the mark and
the pointer. It may help to use chalk or white
paint on the mark to make it more easily seen.
4. Start and run the engine until normal operat-
ing temperature is reached. Approximately 15
minutes and then stop engine.
5.
Start the engine and operate at normal idle
speed, aiming the timing light towards the
timing mark.
6.
Trigger the timing light and observe the
reading from the timing mark.
7.
Compare the reading obtained with the
manufacturers specications. If the timing is
not as specied, slowly rotate the distributor
slightly to obtain a correct reading.
8. Stop the engine.
9. Tighten the distributor clamp bolt.
10.Restart and check the timing.
11. If it is the correct reading, stop the engine and
reconnect the vacuum hose.
3
Safety Information
1.
If your are uncomfortable using this timing light
contact a qualied auto technician.
2.
Always wear safety goggles to protect your
eyes from battery acid, fuel, dust and dirt ying
off moving engine parts.
3. Always wear protective gloves when working
with engine components.
4.
Always ensure that hands, hair, clothing or
cables are clear of any moving or hot parts.
5.
Always follow the vehicle manufacturer’s
recommendation and procedures.
6.
Always turn off the ignition of the vehicle
before connecting the clamps to the battery
and disconnecting the timing light.
7. Always ensure that the hand brake is on and
the vehicle transmission is in Neutral (manual)
or Park (automatic).
8.
Always keep children and unauthorized
persons away from the working area.
9.
Always store the timing light in a safe, dry and
child proof location when not in use.
10.
Always run the engine in well ventilated areas.
11. Always remember that a ashing timing light
“freezes” rotating components. Do not be
tempted to touch an apparently stationary
component which is, in fact, rotating.
12.
Never use the timing light if it is damaged in
any way.
13.
Never smoke, create sparks or use a naked
ame near batteries.
14.
Never rest tools or metallic items on top of the
battery.
15.
Never touch any ignition components when the
ignition is on as very high voltages are present.
16.
Never pull the cables or clamps from the
battery terminals.
17.
Never operate in the vicinity of ammable
liquids or gases.
18.
Never place the timing light on the hot
engine surface.
19.
Never modify the timing light in any way or use
it for a task for which it is not designed.
4
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