Monterey M3 Owner's Manual page 159

Troubleshooting Guide
PROBLEM
PERFORMANCE PROBLEMS
Boat is sluggish and has lost speed & RPM.
The boat vibrates at cruising speeds.
ENGINE PROBLEMS
The engine is running too hot.
The engine alternator is not charging prop-
erly.
160
CAUSE AND SOLUTION
• May need to have marine growth cleaned from hull
and outdrive.
• A Propeller may be damaged & need repair.
• Weeds or line around the propellers. Clean propellers.
• Boat is overloaded. Reduce load.
• Check for excessive water in the bilge. Pump out
bilge, then find & correct the problem.
• The throttle adjustment has changed and the engine
is not getting full throttle.
throttle cable.
• The engine is not producing adequate power. Have
the engine checked by a qualified technician.
• The ballast tank on MSX models is full. Pump out the
ballast tank.
• Propeller may be damaged & need repair.
• A propeller shaft is bent. Repair or replace damaged
components.
• The outdrive is fouled by marine growth or rope.
Clean running gear.
• The outdrive is not trimmed properly.
outdrive.
• The raw water supply line to the pump is kinked.
Replace hose.
• The engine raw water pump belt is loose or worn.
Tighten or replace the belt. (Mercruiser Engines)
• The engine raw water pump impeller is worn or dam-
aged. Repair the pump.
• The engine thermostat is faulty and needs to be re-
placed.
• The freshwater cooling heat exchanger is clogged and
needs to be cleaned.
• The exhaust manifolds or riser water ports are
clogged and need to be cleaned or the manifold or
riser replaced.
• The engine alternator belt is loose or worn. Tighten
or replace the belt.
• The alternator is not charging and must be re-
placed.
• The isolator in the charging system is not working
properly. Replace the isolator.
• A battery is defective and not accepting a charge.
MONTEREY
BOATS
Adjust the throttle or
Trim