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PETROL TIMING LIGHT This Timing Light works on most 12V petrol engine vehicles.
Inductive
Pick Up Lead
No. 1 Spark Plug
Connection of the Timing Light with a petrol vehicle:
1. Connect the Inductive pick-up lead with the Main cable.
2. Connect Battery Clips to the vehicle battery, Red to Positive terminal and Black to Negative
terminal. The vehicle chassis must be connected to the battery Negative terminal.
3. Connect the Inductive pick-up to No.1 SPARK PLUG
What is Timing?
1. The timing light is used to check the timing on spark ignition engines. Correct timing has a positive
influence on the performance and life time of an engine.
2. At the firing point the spark plug ignites the fuel-air mixture forced into the cylinder by the piston.
The flame spreads from the point of ignition throughout the entire combustion chamber. This is the
time when the greatest combustion pressure is exerted on the piston and therefore also the
greatest force is acting on the piston. As a certain time elapses between ignition and the flame
spreading over the entire combustion chamber, ignition must occur before reach the top dead
centre. The correct firing point is specified by the vehicle manufacturer. Incorrect adjustment of
ignition timing can damage the vehicle.
In the owner's manual, and do-it-yourself reference books and data sheets you will find much helpful
information on testing and tuning your vehicle.
Important: Always switch off the ignition before doing the followings:
connecting motor testing instruments
replacing ignition system components
While working on an electronic ignition system, be sure DO NOT touch any live parts once the ignition
is on and the engine is running. With an electronic ignition system dangerous voltages can occur
throughout the system, not only at an individual unit such as the coil or distributor, but also at the
cable harness, on pin-and-socket connectors, or connections to testing instruments etc. When testing
and tuning with the timing light, be sure DO NOT touch any leads between the instrument and the
vehicle.
Preparations for Adjusting the Timing
If the position of the injection pump has been modified or if timing is suspected to be incorrect.
After connect the Timing Light with a petrol engine (as shown in Page 2), run the engine to operating
temperature, and make certain that the contact breaker points or the dwell angle are correctly
adjusted.
1. Use your owner's manual to determine the pertinent technical data of your vehicle (e.g. rpm, dwell
angle).
2. Two marks are needed for adjusting the timing:
a. A fixed mark on the engine housing, usually a pin, arrow or graduated scale
b. A rotating mark on the flywheel or on the crankshaft pulley, mostly in the form of a notch, a steel
ball or a graduated scale
SW-Stahl und Werkzeugvertriebs GmbH
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