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Fig. 368.-Wiring Diagram Showing Relation of Parts of 1916 Oakland-Delco Starting, Lighting
and Ignition System.
is a very heavy current and it would be impossible to conduct this heavy current through the ammeter and still have an ammeter that is sensitive enough to indicate accurately the charging current and the current for lights and ignition. As soon as the engine fires the starting pedal should be released immediately, as the overrunning motor clutch is operating from the time the engine fires until the starting gears are out of mesh. Since they operate at a very high speed, if they held in mesh for any length of time, there is enough friction in this clutch to cause it to heat and burn out the lubricant. There is no necessity for holding the gears in mesh.
Q. What is the “Delco” motor clutch for and how is it lubricated?
A. The motor clutch operates between the flywheel and the armature pinion for the purpose of getting a suitable gear reduction between the motor generator and the flywheel. It also prevents the armature from being driven at an excessively high speed during the short time the gears are meshed after the engine is running on its own power. This clutch is lubricated by the grease cup A, shown in view 1, Fig. 366. This forces grease through the hollow shaft to the inside of the clutch. This cup should be given a turn or two every week.
Q. How does the “Delco” machine deliver electric energy?
A. When the cranking operation is finished the motor brush switch is raised off the commutator by the pin P when the starting pedal is released. This throws the starting motor out of action. As the motor brush is raised off the commutator the generator switch makes contact and completes the charging circuit. The armature is then driven by the extension of the pump shaft and the charging begins. At speeds above approximately 7 miles per hour the generator voltage is higher than the voltage of the storage battery which causes current to flow from the generator winding through the armature in the proper direction to charge the storage battery. As the speed increases up to approximately 20 miles per hour this charging current increases, but at the higher speeds
the charging current decreases. The curve, Fig. 369, shows approximately the charging current that should be received for different speeds of the car. There will be slight variations from this due to temperature changes and conditions of the battery which will amount to as much as from 2 to 3 amperes.
Fig. 370.-Non-Technical Wiring Diagram Showing Parts of the 1916
Delco-Hudson Ignition Starting and Lighting Systems.
Q. What points need lubrication on the “Delco" motorgenerator?
A. There are five places to lubricate this Delco System. No. 1 - The grease cup for lubricating the motor clutch (D, view 1, Fig. 366). No. 2-Oiler for lubricating the gencrator clutch and forward armature bearing (B). No. 3—The oil hole (C) for lubricating the bearings on the rear armature shaft. This is exposed when the rear end cover is removed. This should re