Harbor Freight Tools xenon Advance Timing Light Manual descargar pdf (Pagina 4)

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Operation Tips

Timing Light Basics

Automobile engines work by mixing air, fuel

and a spark to ignite the fuel/air mixture,

creating an explosion, that powers the vehicle.

Maximum power from the explosion must be

delivered to the engine at a precise instant.

Attaining that precise instant is called “Timing”.

Timing is essential for fuel economy and power.

Automobile engine manufacturers determine

the exact timing necessary for every engine

they build. Normal engine and ignition

system wear causes the timing to change,

reducing both fuel efciency and power.

Engine manufacturers use two terms when

describing timing, “advanced” and “retarded”.

Timing is advanced when the spark occurs before

the piston reaches the top of a cylinder. Timing

is retarded when the spark occurs after the

piston has started down in the cylinder. Timing

is changed by adjusting the ignition distributor.

To set timing, the engine manufacturer provides

“timing marks” on the engine’s vibration damper.

Read the vehicle’s manual or contact the

manufacturer for the location of timing marks

on the engine. Also, refer to the vehicle service

manual or contact the manufacturer for the

timing specications for the particular engine.

When to Check Timing

The instant that the spark plug res is

determined by the opening of the distributor

ignition breaker points and will change any

time the point gap or dwell angle is changed.

Normal wear on the breaker point rubbing block

will change the dwell and effect the timing.

Most late model vehicles are equipped with

“breakerless electronic ignition systems” and

will not allow a change in timing, because

there are no breaker points. The Timing Light

can still be used to note changes in the timing

caused by problems in the ignition system or

for resetting the timing when components are

changed (i.e. removed and/or replaced).

Figure 1

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Harbor Freight Tools xenon Advance Timing Light Manual Pagina 4

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