Engine MaintenanceEngine Maintenance

Chapter 8Chapter 8

Marine Engine Controls, Marine Engine Controls, Instruments and AlarmsInstruments and Alarms

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Objectives for the StudentObjectives for the Student

1.Have knowledge of throttle controls used to regulate the speed of the boat

2.Have an understanding of transmission controls used to put the boat into motion

3.Have an understanding of how the various instruments and alarms available at the helm are used to monitor performance of the engine and the various associated systems

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Throttle ControlsThrottle Controls

Lever and RodLever and Rod simplest system simplest system

uses a stiff rod to uses a stiff rod to actuate the actuate the throttlethrottle

Push-Pull Wire Push-Pull Wire and Cableand Cable cable bound in a cable bound in a

flexible sheathflexible sheath can be snaked to can be snaked to

remote locationsremote locations

Fwd Throttle

Rev Throttle

Example of a Push-Example of a Push-Pull Throttle / ShiftPull Throttle / Shift

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Throttle / Transmission Throttle / Transmission ControlsControls

Push-Pull Wire Push-Pull Wire and Cableand Cable

Separate Controls Separate Controls for Throttle and for Throttle and TransmissionTransmission

Hydraulic on Hydraulic on Larger VesselsLarger Vessels

Fwd

RevThrottle

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Engine InstrumentsEngine Instruments

Pressure GaugePressure Gauge Temperature Temperature

GaugeGauge

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Engine InstrumentsEngine Instruments

TachometerTachometer Fuel GaugeFuel Gauge

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Engine InstrumentsEngine Instruments

Charging Indicator Charging Indicator (voltmeter)(voltmeter)

Hour MeterHour Meter

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Engine InstrumentsEngine Instruments

SynchronizerSynchronizer

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Other IndicatorsOther Indicators

Rudder PositionRudder Position used to indicate rudder positionused to indicate rudder position useful when steerageway is limiteduseful when steerageway is limited

Trim Angle IndicatorTrim Angle Indicator used to determine boat’s attitude (pitch)used to determine boat’s attitude (pitch)

Trim Tab Position IndicatorsTrim Tab Position Indicators helps determine tab position, and relative helps determine tab position, and relative

position of port and starboard tabsposition of port and starboard tabs

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AlarmsAlarms

Must be visible and audible to the Must be visible and audible to the operatoroperator

Must work off of available currentMust work off of available current modifications may require help of a service modifications may require help of a service

techniciantechnician Readily available on the aftermarketReadily available on the aftermarket

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AlarmsAlarms

Bilge Flooding AlarmsBilge Flooding Alarms easily hooked into bilge pump circuiteasily hooked into bilge pump circuit

Engine AlarmsEngine Alarms can be used to alert many conditionscan be used to alert many conditions

low oil pressurelow oil pressure high coolant temperaturehigh coolant temperature charging statecharging state

CO DetectorCO Detector Smoke AlarmSmoke Alarm