V4.0 Diesel and Gasoline Engine Timing Light 8706855
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maximum efficiency from the ignition, while some vehicles equipped with
emission control devices will have a retarded ignition to reduce pollution.
Adjusting the ignition distributor will change the engine timing. Timing marks
may be found on the engine vibration damper or the fan pulley at the lower front
part of the engine. Older style engines the mark is found on the flywheel.
WHEN TO CHECK TIMING
Problems with ignition system’s spark plugs or breaker points on an older
engine can cause a timing misfire. This can occur due normal wear on the
components that will eventually require replacement.
Replacing engine components in the ignition system may also require you to
reset the timing. The new component’s setting or configuration out of the box
may be incorrect for your engine.
GENERAL OPERATING PROCEDURE
WARNING! Keep any part of your body or tools away from moving engine
parts when using this tool. The stroboscopic nature of the timing light will
make parts appear to move slowly or not at all. Amputation or a grevious
injury may result in contacting the engine part.
The tool has multiple functions. Follow the general operating procedure when
performing a task, but use the alternate steps for specific function. See the
specific tasks following this section.
1. Locate the engine timing mark. Clean the area around the mark and pointer
of all grease and dirt. Chalk or white paint added to the marks may make
them easier to see.
a. The timing mark may be a line in older vehicles or a timing tape
displaying the number of degrees on newer vehicles.
2. Check the manufacturer's specifications for the engine being serviced. The
specifications may be found in the vehicle or engine manual, or on a decal
beneath the car hood. This information normally includes the Ignition
Timing, Spark Plug Gap, Dwell and Idle Speed.
a. There may be other instructions on what vehicle systems should be
shut off or turned on during the test. Follow these instructions.
3. Run the engine until the engine’s normal operating temperature is reached,
then stop the engine.