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FIGURE 6.
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.
SMALL ENGINES
The DC power Timing Light can be used on
any combustion engine with impulse ignition,
magneto ignition, such as motorcycles, 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 extemal 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 the proper spark plug.
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 7.)
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 wom out distributor cam or bent distributor
shaft. Repair as required.
E N G L I S H
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