7-5
PROBLEM CAUSE SOLUTION
Rough running (con’t)
Engine overheating
Sludge in oil
Poor Performance
Vibration
6. Kinked or clogged fuel lines, or fuel tank
vent line
7. Air intake obstructed
1. Bad sending or receiving unit
2. Loose wiring connections at sending or
receiving unit
3. Worn or broken impeller in sea
water pump
4. Clogged oil cooler
5. Exhaust lines plugged
6. Ignition timing late
7. Restricted water intake
1. Infrequent oil changes
2. Dirty oil filter
1. Damaged or improper propeller
2. Excessive water in bilge area
3. Boat overloaded or improper distribution
of load
4. Fouled or damaged hull bottom
1. Loose engine mounting bolts
2. Damaged propeller shaft
3. Propeller bent or pitch out of true
6. Use compressed air, at not more than
20 psi, to blow-out obstruction. Replace
line if kinked.
7. Check air intake.
1. Replace unit(s).
2. Tighten all connections.
3. Replace impeller.
4. Remove obstruction.
5. Remove obstruction.
6. Time engine.
7. Clean water intake.
1. Drain and refill with proper grade and
viscosity oil.
2. Replace oil filter.
1. Inspect propeller and replace if required.
2. Pump out bilge area. Inspect for causes
related to excess water.
3. Reduce load or redistribute load.
4. Inspect, clean, or repair as required.
1. Inspect and tighten as required.
2. Replace shaft.
3. Inspect propeller and replace as
required.
WARNING: Wear protective eye wear
when performing compressed air cleaning.
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