3583605 Volvo.Penta Hexagon screw

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Grounding Stud To Battery Ground ("−")
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Alternate Grounding Stud To Battery Ground ("−")The engine must have a wire ground to the battery.Ground wires or ground straps should be combined at ground studs that are only for ground use. Check that the grounds are tight and grounds are free of corrosion.
When jump starting an engine, the instructions in Operation and Maintenance Manual, "Starting with Jump Start Cables" should be followed in order to properly start the engine.This engine may be equipped with a 12 volt starting system or a 24 volt starting system. Only equal voltage for jump starting should be used. The use of a higher voltage will damage the electrical system.The Electronic Control Module (ECM) must be disconnected at the J1/P1 and J2/P2 locations before welding on the vehicle.
Engine Electrical System
The electrical system has two separate circuits:
Starting circuit
Low amperage circuitSome of the electrical system components are used in more than one circuit. The following components are used in each of the three circuits:
Battery
Circuit breaker
Ammeter
Battery cablesThe charging circuit is in operation when the engine is running. A voltage regulator in the circuit controls the electrical output in order to keep the battery at full charge.
The disconnect switch, if equipped, must be in the ON position in order to let the electrical system function. There will be damage to some of the charging circuit components if the engine is running with the disconnect switch in the OFF position.
If the machine has a disconnect switch, the starting circuit can operate only after the disconnect switch is put in the ON position.The starting circuit is in operation only when the start switch is activated.Both the low amperage circuit and the charging circuit are connected to the same side of the ammeter. The starting circuit is connected to the opposite side of the ammeter.Starting System Components
Starting Solenoid
A solenoid is a magnetic switch that does two basic operations:
The solenoid closes the high current starting motor circuit with a low current start switch circuit.
The solenoid engages the electric starting motor pinion with the ring gear.
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SolenoidThe solenoid has windings (one set or two sets) around a hollow cylinder. The plunger can move forward and backward. When the start switch is closed and electricity is sent through the windings, a magnetic field is created. The magnetic field pulls the plunger forward in the cylinder. Pulling the plunger forward moves the shift lever in order to engage the pinion drive gear with the ring gear. The front end of the plunger then makes contact across the battery and the motor terminals of the solenoid. After the contact is made, the starting motor begins to turn the flywheel of the engine.When the start switch is opened, current no longer flows through the windings. The spring now pushes the plunger back to the original position. At the same time, the spring moves the pinion gear away from the flywheel.When two sets of solenoid windings are used, the windings are called the hold-in winding and the pull-in winding. Both sets of windings have the same number of turns around the cylinder, but the pull-in winding uses a wire with a larger diameter. The wire with a larger diameter produces a greater magnetic field. When the start switch is closed, part of the current flows from the battery through the hold-in windings. The rest of the current flows through the pull-in windings to the motor terminal. The current then flows through the motor to ground. The solenoid is fully activated when the connection across the battery and the motor terminal is complete. When the solenoid is fully activated, the current is shut off through the pull-in windings. Only the smaller hold-in windings are in operation. The hold-in windings operate for the duration of time that is required in order to start the engine. The solenoid will now draw less current from the battery, and the heat generated by the solenoid will be kept at an acceptable level.Starting Motor
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Electric starting motor components (1) Brush assembly (2) Field windings (3) Solenoid (4) Clutch (5) Pinion (6) ArmatureThe starting motor is used to turn the engine flywheel at a rate that will allow the engine to start running.Note: Some starting motors have ground straps that connect the starting motor to the frame. But, many of these starting motors are not grounded to the engine. These starting motors have electrical insulation systems. For this reason, the ground strap that connects the starting motor to the frame may not be an acceptable engine ground. Starting motors that were installed as original equipment are grounded to the engine. These starting motors have a ground wire from the starting motor to the negative terminal of the battery. When a starting motor must be changed, consult an authorized dealer for the proper grounding practices for that starting motor.The starting motor has a solenoid. When the ignition switch is turned to the START position, the starting motor solenoid will be activated electrically. The solenoid plunger will now move a mechanical linkage. The mechanical linkage will push the pinion in order to engage with the flywheel ring gear. The pinion will engage with the ring gear before the electric contacts in the solenoid close the circuit between the battery and the starting motor. When the circuit between the battery and the starting motor is complete, the pinion will turn the engine flywheel. A clutch gives protection for the starting motor so that the engine cannot turn the starting motor too fast.When the ignition switch is released from the START position, the starting motor solenoid is deactivated.