Engine Maintenance Chapter 8 Marine Engine Controls, Instruments and Alarms

2 Objectives 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

3 Throttle Controls Lever and Rod Lever and Rod simplest system uses a stiff rod to actuate the throttle simplest system uses a stiff rod to actuate the throttle Push-Pull Wire and Cable Push-Pull Wire and Cable cable bound in a flexible sheath cable bound in a flexible sheath can be snaked to remote locations can be snaked to remote locations Fwd Throttle Rev Throttle Example of a Push- Pull Throttle / Shift Example of a Push- Pull Throttle / Shift

4 Throttle / Transmission Controls Push-Pull Wire and Cable Push-Pull Wire and Cable Separate Controls for Throttle and Transmission Separate Controls for Throttle and Transmission Hydraulic on Larger Vessels Hydraulic on Larger Vessels Fwd Rev Throttle

5 Engine Instruments Pressure Gauge Pressure Gauge Temperature Gauge Temperature Gauge

6 Engine Instruments Tachometer Tachometer Fuel Gauge Fuel Gauge

7 Engine Instruments Charging Indicator (voltmeter) Charging Indicator (voltmeter) Hour Meter Hour Meter

8 Engine Instruments Synchronizer Synchronizer

9 Other Indicators Rudder Position Rudder Position used to indicate rudder position used to indicate rudder position useful when steerageway is limited useful when steerageway is limited Trim Angle Indicator Trim Angle Indicator used to determine boat’s attitude (pitch) used to determine boat’s attitude (pitch) Trim Tab Position Indicators Trim Tab Position Indicators helps determine tab position, and relative position of port and starboard tabs helps determine tab position, and relative position of port and starboard tabs

10 Alarms Must be visible and audible to the operator Must be visible and audible to the operator Must work off of available current Must work off of available current modifications may require help of a service technician modifications may require help of a service technician Readily available on the aftermarket Readily available on the aftermarket

11 Alarms Bilge Flooding Alarms Bilge Flooding Alarms easily hooked into bilge pump circuit easily hooked into bilge pump circuit Engine Alarms Engine Alarms can be used to alert many conditions can be used to alert many conditions low oil pressure low oil pressure high coolant temperature high coolant temperature charging state charging state CO Detector CO Detector Smoke Alarm Smoke Alarm