Figure 1-13. Diagram C

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Figure 1-9. Operation of fuel pump

TM-5-2805-261-13 Outboard Motor Gasoline Powered OMC Model AM-40A NSN 2805-01-105-1680 Manual

Figure 1-17. Diagram G

TM 5-2805-261-13

The fuel tank has a capacity of six gallons and

is portable. Attached to the tank is a bulb

primer for priming the fuel pump, fuel hose and

connector, a bracket arrangement to hold the

fuel line when it is not in use, a handle, and a

vent assembly in the filler cap. It also has a

gage to show amount of fuel in the tank.

Figure 1-11. Diagram A

The coil of insulated wire wound around the middle leg of the

laminations is affected by this fluctuating magnetism. This

results in an electric current being set up in the coil.

Because the magnetism is alternating between North and South

polarity, the current is also alternating between positive and

negative. Diagram B illustrates the alternating current (AC).

Figure 1-10. Fuel tank

C. IGNITION SYSTEM. The ignition system provides the

spark needed to ignite the air/ fuel mixture in the

Figure 1-12. Diagram B

cylinders. It is a capacitor discharge system which

means the charge of electricity is generated by

This coil current is routed through wires into the power pack

magnets in the flywheel rotating past the charge coil.

where it will be stored temporarily in a capacitor. A capacitor,

The initial electrical charge is generated by the

however, will not store alternating current. Inside the power

operator using the manual starter.

pack is a diode which is an electronic device that allows current

to flow in only one direction. In other words, it only allows the

The magnets have North and South magnetic

positive current to pass. Diagram C illustrates what happens

poles and the charge coil laminations have three

when the AC is passed through a diode. Only the positive

legs. Each time one of the magnetic poles

portion of the current remains. The capacitor will accept this.

passes one of the legs of the charge coil, the

laminations become magnetized. When the

opposite pole of the magnet passes the same

leg, the magnetism in the laminator collapses

and reverses polarity. As you can see from

diagram A, the magnets keep on rotating past

all three legs of the ignition coil. Therefore, this

changing magnetism in the coil laminations

Figure 1-13. Diagram C

reverses three times in one pass of a magnet.

The capacitor in the power pack will hold this charge until it's

released. Here's how that takes place:

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