Mercury 92-813054A2, Manual

Page: 91 / 97

Section 7 - Troubleshooting
90-8M0069748
eng
APRIL 2012 Page 83
Poor Performance
Possible Cause Remedy
Throttle not fully open. Inspect throttle cable and linkages for proper operation.
Damaged or improper propeller. Replace propeller. See a Mercury Diesel authorized repair facility.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or improperly distributed. Reduce load or redistribute more evenly.
Boat bottom fouled or damaged.
Clean or repair as necessary.
Electronic fuel system fault.
Have electronic fuel system checked by a Mercury Diesel authorized repair
facility.
Incorrect Engine Temperature
Possible Cause Remedy
Water inlet or seacock closed. Open.
Drive belt loose or in poor condition. Replace or adjust belt.
Seawater pickups or sea strainer obstructed. Remove obstruction.
Faulty thermostat. Replace. See a Mercury Diesel authorized repair facility.
Coolant level low in closed cooling section.
Check for cause of low coolant level and repair. Fill system with
proper coolant solution.
Heat exchanger cores plugged with foreign material.
Clean heat exchanger. See a Mercury Diesel authorized repair
facility.
Loss of pressure in closed cooling section.
Check for leaks. Clean, inspect, and test pressure cap. See a
Mercury Diesel authorized repair facility.
Faulty seawater pickup pump. Repair. See a Mercury Diesel authorized repair facility.
Seawater discharge restricted or plugged.
Clean exhaust elbows. See a Mercury Diesel authorized repair
facility.
Seawater inlet hose kinked (restricted). Position hose to prevent kinking (restriction).
Use of improperly designed hose on inlet side of
seawater pump allowing it to collapse.
Replace hose with wire reinforced design.
Faulty thermostats. Replace. See a Mercury Diesel authorized repair facility.
Low Engine Oil Pressure
Possible Cause Remedy
Faulty senders. Have system checked by a Mercury Diesel authorized repair facility.
Insufficient oil in crankcase. Check and add oil.
Excessive oil in crankcase (causing it to
become aerated).
Check and remove required amount of oil. Check for cause of excessive oil
(improper filling).
Diluted or improper viscosity oil.
Change oil and oil filter, using correct grade and viscosity oil. Determine cause
for dilution (excessive idling).
Battery Will Not Charge
Possible Cause Remedy
Excessive current draw from battery. Turn off non‑essential accessories.
Loose or dirty electrical connections or damaged wiring.
Check all associated electrical connections and wires (especially
battery cables). Clean and tighten faulty connections. Repair or
replace damaged wiring.
Alternator drive belt loose or in poor condition. Replace or adjust.