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INSTRUCTIONS CONT.
Rotary Engine
The timing Light can be used on rotary engines. Follow the manufacture’s specific instructions and
specifications. Below is a typical procedure for the Mazda twin rotor engine.
1. Connect the Red and Black power leads clamps to the battery. Connect wire with the spark
plug adaptor to the leading spark plug on the front rotor housing.
2. Start the engine and run at idle speed.
3. Aim the timing light at the timing indicator pin on the front cover
4. Loosen the distributor locking nuts and rotate the leading side distributor body until the timing
mark on the eccentric shaft pulley are in line with the timing indicator pin.
5. Tighten the locking nuts and recheck the timing.
6. Repeat the above step for setting the trailing side distributor timing with the timing light
connected to the trailing spark plug.
Ail timing lights are tested 100% before they are shipped from the factory and improper operation is
usually caused by incorrect hook‐up. Please observe the above trouble shooting procedure if the
timing light fails to perform satisfactorily.
INSTRUCTIONS CONT.
Testing Centrifugal Advance
1. With the timing light still connected and with the vacuum line disconnected:
2. Speed the engine up slowly and watch the timing mark.
3. The timing mark should remain stationary until the engine reaches the manufactures specified
speed. The timing mark should then move steadily and without jerking.
4. If the mark does not move, or if it moves erratically, the centrifugal (automatic) advance should
be serviced as necessary.
5. To check the maximum advance stop the engine.
6. It’s necessary to mark the harmonic balance with the maximum degree per manufacturer’s
specifications and follow manufacture’ procedures.
Testing Vacuum Advance
1. The vacuum line to the distributor must be connected to make this test.
2. Set engine speed to 800 R.P.M or speed necessary to apply vacuum to distributor.
3. Aim the timing light and note position of the timing Mark.
4. Disconnect vacuum line.
5. If the timing mark does not move, the trouble could be a plugged line. A leaky diaphragm or a
frozen distributor Plate, and the distributor should be serviced as required.
Checking Distributor Cam Wear
1. This check is done after the timing has been set and the timing mark lines up with the
reference pointer for #1 cylinder.
2. Connect the timing light to the wire directly opposite (180) #1 cylinder on the distributor cap,
see figure 5.
3. Start engine and aim the timing light towards the timing mark. The reading should be the same
as when connected to #1 cylinder.
4. If reading is not the same, probable cause is worm out distributor cam or bent distributor shaft.
Repair as required.
4-Cyl move from #1 to #4 6-Cyl move from #1 to #4 8-Cyl move from #1 to #6
Small Engines
The DC power Timing Light can be used on any combustion engine with impulse ignition, magneto
ignition, such as motorcycle, lawn mowers, outboard motors, or any time there is a high voltage
spark used for ignition.
When 12 Volt DC voltage is not available from the engine being tested, an external battery of 12V
must be used. Connect a ground from the negative post of the external battery to the engine.
Connect the red clip to the (+) positive terminal and the black clip to the (‐) negative terminal of the
battery. Connect the adaptor lead of the timing light to proper spark plug.
TROUBLE SHOOTING
SYMPTOM PROBABLE CAUSE SOLUTION
No Flash Switch in “OFF” position.
Move switch to “ON” position.
Battery clips connected Reverse the battery clip
backwards. connection.
Poor connection of clips. Make sure the clip is
connected to a clean
battery post.
No Flash but double Wrong direction of Toward the arrow on
check indictor is “ON” inductive clamp. clamp to #1 plug.
Weak ignition or spark plug. Connect to other plugs or
The gap is too close. spark plug wires. If ashes
then repair the plug gap.
Fault Lamp Replace it.
Light Flashes Intermittently Timing light high-tension Place the high tension wire
wire lying on or too close in good order so it is routed
to the other spark plug wires.
away from the other spark
plug wires.
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