Possible Cause Remedy
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 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.
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 nonessential 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.
Unacceptable battery condition Test battery.
NOTE: Check for faults on the MFD and contact a Mercury Diesel authorized repair facility for assistance.
Section 7 - Troubleshooting
90-8M0117076 eng FEBRUARY 2018 Page 83
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