Marine Propulsion Systems

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EM 101 Overview

• Marine Propulsion Systems
• Marine Engine Principles
• Marine Engine Components
• Marine Engine Controls, Instruments and Alarms
• Marine Engine Maintenance
• Marine Engine Winter Storage
• and Spring Service
• Marine Steering Systems

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Marine Propulsion Systems

• Outboard Systems
• Portable Outboard Motors
• Fixed Outboard Engines
• Auxiliary Outboard Motors
• Inboard Systems
• Straight Drive
• Vee Drive
• Stern Drives
• Water-Jet Drives
• Other

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Portable Outboard Motors

• Usually less than 30 HP
• Man portable
• Components
• Power Head
• Intermediate Housing
• Lower Unit
• Attached to boat
• Trim adjustment
• Normally Mechanical

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Fixed Outboard Engines

• Usually over 30 HP
• Require special lift
• Similar to Portable
• Same components
• Except for size
• Trim adjustment
• Normally Hydraulic

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Auxiliary Outboard Motors

• Usually under 20 HP
• On Sailboats
• Similar to Portable
• Same components
• Longer intermediate housing
• Not for speed
• Trim adjustment
• Normally Mechanical

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Straight Drive

• aka Conventional Inboard System
• Components
• Engine
• Transmission
• Stuffing Box and Strut (with Cutless Bearing)

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Vee Drive

• Transmission forward of engine
• Same Components
• Engine
• Transmission
• Stuffing Box and Strut (with Cutless Bearing)

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Stern Drive

• aka Inboard / Outboard
• Advantages of Inboard Engine
• Maneuverability of Outboard Propeller

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Water-Jet Drive

• Propeller and shaft replaced by water-jet pump
• Excellent for shallow-water
• Note Reverse Gate

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Other

• Electric Trolling Motors
• Side Thrusters
• Sail Drive
• Surface-piercing Drive

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Summary

• Outboard Systems
• Portable, Fixed and Auxiliary
• Power Head, Intermediate Housing and Lower Unit
• Inboard Systems
• Straight and Vee Drives
• Engine, Transmission and Stuffing Box
• Stern Drive
• aka Inboard / Outboard
• Water-Jet Drive
• Propeller and shaft replaced by water-jet pump