Low Engine Oil Pressure; Battery Will Not Charge - Mercury MerCruiser Series Manual

Possible Cause
Loss of pressure in closed cooling section
Faulty seawater pickup pump
Seawater discharge restricted or plugged
Seawater inlet hose kinked (restricted)
Use of improperly designed hose on inlet side of
seawater pump allowing it to collapse

Low Engine Oil Pressure

Possible Cause
Faulty senders
Insufficient oil in crankcase
Excessive oil in crankcase (causing it to
become aerated)
Diluted or improper viscosity oil

Battery Will Not Charge

Possible Cause
Excessive current draw from battery
Loose or dirty electrical connections or damaged wiring
Alternator drive belt loose or in poor condition
Unacceptable battery condition
NOTE: Check for faults on the MFD and contact a Mercury Diesel authorized repair facility for assistance.
90-8M0117076 FEBRUARY 2018
eng
Check for leaks. Clean, inspect, and test pressure cap. See a
Mercury Diesel authorized repair facility.
Repair. See a Mercury Diesel authorized repair facility.
See a Mercury Diesel authorized repair facility.
Position hose to prevent kinking (restriction).
Replace hose with wire reinforced design.
Have system checked by a Mercury Diesel authorized repair facility.
Check and add oil.
Check and remove required amount of oil. Check for cause of excessive oil
(improper filling).
Change oil and oil filter, using correct grade and viscosity oil. Determine cause
for dilution (excessive idling).
Turn off nonessential accessories.
Check all associated electrical connections and wires (especially
battery cables). Clean and tighten faulty connections. Repair or
replace damaged wiring.
Replace or adjust.
Test battery.
Section 7 - Troubleshooting
Remedy
Remedy
Remedy
Page 83