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Questions and Answers
What is the Powerhead?
Oil seal is designed to keep ___ in and prevent _____ or dust from coming in from outside.
oil/water
What is the function of the bracket in motors?
Attaches the motor to the boat, allows for trim and tilt movements, allows motors to pivot for steering, acts as a shock absorber.
Install a circle with the ___________ side opposite the direction of force.
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Mechanical ignition spark advance timing is changed by physically moving the pulsar coil.
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The motor may stall, make poor power, or even be damaged if ignition timing is incorrect.
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What information does the pulsar coil supply for the ignition system?
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Which AC system uses a capacitor?
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Which system type would use AC based on ignition system?
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Ethanol is used to raise the octane rating of gasoline and attracts water molecules. Select all that apply.
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Match the following components with their functions:
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What is a carbureted motor?
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What adjusts the airflow rate for engine starting?
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When assembling the lower unit, _____ gear oil, grease, and sealant to the specified areas.
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When assembling the lower unit to measure the backlash after selecting the pinion shims, ____________ gear oil, grease, or sealant to the parts.
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The relief valve opens when the PT/T reaches the limit of its travel.
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What is the function of the PT/T motor?
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The ignition system needs to produce high voltage to ignite the air-fuel mixture.
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If a spark plug gap becomes damaged, it may cause an ignition misfire.
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Study Notes
Outboard Motor Essentials
- The powerhead houses the motor which is crucial for propulsion.
- Outboard motors integrate motor and drive into one unit, simplifying installation and maintenance.
- Steering can be handled through remote or direct control mechanisms, enhancing maneuverability.
- Inboard motors are often utilized in larger vessels for stability and power.
Oil System Components
- The oil seal's purpose is to retain oil and prevent water or dust ingress, maintaining system integrity.
- Ensuring the correct oil level is vital; check the dipstick accurately to avoid operational issues.
Motor Assembly and Functionality
- The bracket serves multiple purposes: attaching the motor to the boat, allowing for trim and tilt, enabling steering pivot, and acting as a shock absorber against underwater impacts.
- Installation direction of circlips must consider mechanical force, placing the sharp edge opposite the applied force.
Ignition System Insights
- Mechanical ignition spark advance alters timing by moving the pulsar coil; older technology prior to the introduction of electrical advancements.
- Incorrect ignition timing can cause motor stalling or damage, highlighting the need for precision in timing settings.
- The pulsar coil is integral as it provides the crankshaft position to the ignition system.
Fuel and Maintenance Factors
- CDI (Capacitor Discharge Ignition) utilizes a capacitor for ignition, while TDI (Transistorized Direct Ignition) employs transistors.
- Ethanol is commonly mixed with gasoline to enhance the octane rating but is known to attract water, posing storage concerns.
- Regular maintenance prevents emissions contamination, filter clogging, and corrosion in fuel systems.
Propeller Dynamics
- Propeller pitch influences performance: lower pitch offers better acceleration but limits top speed; higher pitch enhances speed but reduces acceleration.
- Propeller dimensions include diameter, pitch (distance traveled per revolution), rake (blade angle), and cup (curved blade tip edge).
- More blades on a propeller increase surface area and decrease vibrations, improving overall performance.
Fuel and Oil Systems
- The order of oil flow ensures proper lubrication: from the oil pan to the pump, through the filter, and to the necessary components.
- Oil levels must be monitored especially in oil-injected two-stroke motors, as running out of oil can lead to severe damage.
Ignition Coil and Spark Plug Mechanics
- Spark plugs are critical components that must endure harsh conditions and require regular replacement for optimal engine performance.
- High voltages generated by ignition coils (often exceeding 10,000 VDC) ignite the air-fuel mixture necessary for combustion.
- The spark plug gap, if incorrect, can lead to misfires and affect overall engine performance.
Mechanical and Electrical Considerations
- Mutual induction is utilized in ignition coils to generate voltage, reinforcing the electrical nature of ignition systems.
- Different ignition control methods include fixed, electronic, and mechanical systems, each suited to specific motor designs.
- DC-based ignition systems are prevalent in larger engines, as they offer stable performance across various RPMs.
Component Assembly and Design
- Correct assembly of gears is essential; excess backlash can impair performance and should be monitored.
- Each component within an outboard motor, such as the cylinder head and crankshaft, plays a significant role in engine function and efficiency.
- Regular checks of mechanical points in ignition systems ensure reliability and address potential ignition issues proactively.
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Description
Test your knowledge on outboard motor components and functionality. This quiz covers powerheads, oil systems, motor assembly, and ignition systems. Dive into the details and ensure you understand the essentials of outboard motors.
