Possible Cause Remedy
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.
Insufficient Engine Temperature
Possible Cause Remedy
Faulty thermostats. Replace. See a Mercury Diesel–authorized repair facility.
Low Engine Oil Pressure
Possible Cause
Remedy
Faulty senders. Have the system checked by a Mercury Diesel–authorized repair facility.
Insufficient amount of oil in the crankcase. Check and add oil as required.
Excessive oil in crankcase (causing it to
become aerated).
Check and remove the required amount of oil. Check for cause of excessive oil
(improper filling).
Diluted or improper viscosity oil.
Change oil and oil filter. Use the correct grade and viscosity oil. Determine the
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.
Remote Control Operates Hard, Binds, Has Excessive Free‑play, or Makes Unusual Sounds
Possible Cause
Remedy
Insufficient lubrication on shift and throttle linkage
fasteners.
Lubricate.
Obstruction in the shift or throttle linkages. Remove the obstruction.
Loose or missing shift and throttle linkages.
Check all throttle and shift linkages. If any are loose or missing, see a
Mercury Diesel–authorized repair facility immediately.
Shift or throttle cable kinked.
Straighten cable or have a Mercury Diesel–authorized repair facility
replace cable if damaged beyond repair.
Improper shift cable adjustment. Have adjustment checked by a Mercury Diesel–authorized repair facility.
Steering Wheel Turns Hard or Jerky
Possible Cause
Remedy
Low power steering pump fluid level. Check for leak. Refill the system with fluid.
Drive belt loose or in poor condition. Replace and/or adjust.
Insufficient lubrication on the steering components. Lubricate.
Loose or missing steering fasteners or parts.
Check all parts and fasteners; if any are loose or missing, see a Mercury
Diesel–authorized repair facility immediately.
Contaminated power steering fluid. See a Mercury Diesel–authorized repair facility.
Section 6 - Troubleshooting
Page 96 90-8M0145546 eng MAY 2018
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