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Page 5
SKU 03343
Operation (continued)
7. Squeeze the trigger on the timing light and direct the flash onto the engine timing marks to
obtain a reading. Compare the reading from the timing mark to the reading in the
manufacturer’s specifications. If the timing does not match with the timing listed in the
manufacturer’s specifications, adjust the timing.
Adjusting the timing.
1. Loosen the bolt that locks down the distributor, but do not fully remove it. It should be loose
enough so that you can rotate the distributor back and forth. Do not over-loosen the bolt
allowing the distributor to move on its own.
2. Start and run the engine up to temperature.
3. Direct the beam from the Timing Light at the timing marks and slowly rotate the distributor
in very small increments. Rotate the distributor either right or left until the timing lines are
lined up (in line with the pointer). See FIGURE 2. Stop the engine.
4. Tighten the distributor lock down bolt using care not to change the position of the
distributor.
5. Start the engine and recheck the timing. If the timing is not right, you probably moved the
distributor while bolting it back down. Reset the timing.
FIGURE 2
FIGURE 3
Note: In some cases, the ignition spark may jump to the baffle or the engine block. This
usually occurs on late model 8 cylinders (Ford) because the timing light adaptor spring is too
close to metal engine parts. To solve the problem, follow the wire from the spark to the
distributor cap. Disconnect the wire at the cap and install an adapter spring (not included) as
shown in FIGURE 3.
6. If you have no other tests to perform with the Timing Light, turn off the engine and
reconnect the vacuum line. If you have further tests, first check to see if the vacuum line
needs to be connected for those tests.
Adapter
Spring
Max.
Advance
To No.1 Spark Plug
Max.
retard
Pointer
Rotation
Pulley
Belt
Timing Marks