ENGINE & STERN DRIVE
DIAGNOSTIC CHART
Problem Possible Cause
Engine Overheating Water pick-up feeds are blocked by
debris
Cooling system drain plugs not installed
Cooling system leak
Impeller is damaged or blocked by debris
Propeller is over propped for the
circumstances, causing the engine to
work extra hard
Debris in oil is holding heat more than
normal - bad oil fi lter
Bad thermostat or gauge
Raw water cooling system has corroded
from raw water left in the system
Low Oil Pressure High oil level
Low oil level
Oil system leak
Drive oil sensor not reset at last oil
change
Increased engine temperature (see engine
overheating)
Engine Will Not Crank Binnacle control lever not in neutral
Emergency stop switch activated
8-2
Chapter 8
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