Harbor Freight Tools xenon Advance Timing Light Manual descarregar pdf (Página 7)

Page 7For technical questions, please call 1-800-444-3353.Item 40963

Testing Vacuum Advance

1. Speed the engine up slowly to the

manufacturer’s specied speed

for this test (often 2000 RPM)

and leave the vacuum line

detached from the distributor.

2. Aim the Timing Light at the timing marks

and turn the timing advance knob on the

back of the timing light up slowly until

the timing mark moves to TDC or 0.

3. Connect the vacuum line

to the distributor.

4. If the timing mark stays still, the

trouble could be a plugged line,

a leaky diaphragm, or a frozen

distributor plate. See a certied

mechanic if the mark doesn’t move.

5. Read the amount of vacuum advance

from the timing marks on the engine.

Compare with vehicle service manual.

Checking Distributor

Cam Wear

1. This test is done after the timing

has been set and the timing

light lines up with the reference

pointer for cylinder number 1.

2. Connect the Timing Light to the spark

plug wire directly opposite (180º)

from the number 1 cylinder on the

distributor cap. See Figure 4.

#1 Cylinder

Opposite

Cylinder

8 Cylinder

3 1

6 2

Opposite

Cylinder

#1 Cylinder

6 Cylinder

#1 Cylinder

Opposite

Cylinder

4 Cylinder

Figure 4

Note: The opposite cylinder is opposite

the #1 Cylinder on Distributor Cap.

3. Start the engine and aim the

Timing Light towards the timing mark.

The reading should be the same as

when the Timing Light was connected

to the number 1 cylinder wire.

If not, the probable cause is a worn out

distributor cam, bushing, or bearing,

or bent distributor shaft. Contact a

qualied service technician for repairs.

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