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Naut Air Sec 9_2008.qxd:Naut Air Sec 9.qxd
Section 9
Trouble Check Chart
Performance
Symptom
Starter motor will not operate
Engine will not start
Poor boat performance
Poor gas mileage
Excessive vibration
Engine runs but boat
makes little or no
progress
Steering problem
Throttle/shifting problems
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4:10 PM
Page 9-2
Possible Cause
• Shift handle not in NEUTRAL
• Battery Selector switch OFF
• Battery and electrical connection
loose or corroded
• Emergency stop switch not in
place
• Starting procedure not followed
• Fuel tank empty
• Contaminated fuel
• Clogged fuel filter
• Uneven load distribution
• Improper propeller selection
• Marine growth on hull
• Engine problem
• Marine growth on hull
• Engine problem
• Damaged or fouled propeller
• Misaligned propeller shaft
coupling
• Bent propeller shaft
• Engine problem
• Fouled or damaged propeller
• Engine problem
• Corroded steering cable
• Rudder worn
• Corroded cables
• Defective throttle return spring
• Low transmission fluid level
• Sticking transmission shift lever
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