Troubleshooting
108
VPA 7743722 English 10-2004
Engine Noises and
Vibrations (Cont.)
Cooling System
Supply pump.
Loose belts and/or pulleys.
See
Cooling System
on page 84.
Mountings
Loose, broken, or worn engine mounts.
Loose lag screws holding mounts to stringer.
Crankshaft Balancer or Flywheel
Loose bolt(s).
Alternator
Loose pulley and/or worn bearings.
Loose mounting bolts.
Sterndrive
Failed U–joints or gimbal bearing.
Damaged internal drive components.
Worn, bent, or broken propeller hub or blades.
Loose, worn, or damaged engine coupler.
Engine Overheats
Check:
Actual engine temperature by verifying with an accurate thermome-
ter.
Gauge operation and wiring circuit.
Sending unit operation and wiring circuit.
Supply pump, circulating pump, and belt(s).
Water intake screens–for blockage.
Thermostat.
Water supply hoses.
Engine timing.
Water leaks on pressure side of supply pump.
Air leaks on suction side of supply pump.
Engine compression.
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