Engine Runs Rough
If At Slow Speed – Check:
•
Ignition system secondary circuit; spark plug wires,
spark plugs.
•
Fuel quality; octane too low, ethanol percentage too
high, water in fuel, old fuel.
•
Fuel filters; water or debris.
If At High Speed – Check:
•
Air leak on suction side of fuel system.
•
Ignition system secondary circuit; spark plug wires,
spark plugs.
•
Fuel quality; octane too low, ethanol percentage too
high, water in fuel, old fuel.
•
Fuel filters; water or debris.
Engine Temperature Too High
Check:
•
Water intakes on drive blocked. Tilt the drive up and
look for obstructions to the water intakes (e.g., sea-
weed, plastic bags, etc.).
•
Check cap on running engine flush port to ensure it
is securely in place. See
•
Seawater pump impeller damaged or blocked. For
additional information see
Maintenance: Impeller:
Checking & Replacing
. Must have tools and parts
on hand.
•
Seawater pump, circulating pump, and belts.
•
Coolant level in expansion tank. See
•
Water supply hoses; loose clamps, holes in hoses,
collapsed or restricted hoses.
•
Air leaks on suction side of seawater pump; loose
clamps, cap on flush fitting.
•
Water leaks on pressure side of seawater pump.
•
Heat exchanger; water passages blocked with
grass, sand, mud, or other debris.
Troubleshooting
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