Troubleshooting Charts
Starter Motor Will Not Crank Engine, or Cranks Slow
Possible Cause Remedy
Battery switch turned off Turn switch on.
Open circuit breaker or blown fuse Check and reset circuit breaker or replace fuse.
Loose or dirty electrical connections or damaged wiring
Check all electrical connections and wires (especially battery cables).
Clean and tighten faulty connection.
Bad or discharged battery Test, charge, or replace if bad.
Lanyard stop switch or E‑stop switch activated Check lanyard stop switch, or E‑stop switch.
Engine Will Not Start, or Is Hard to Start
Possible Cause
Remedy
Improper starting procedure Read starting procedure. Be sure to allow preheat time in cold weather.
Empty fuel tank or fuel shut‑off valve closed Fill tank or open valve.
Clogged fuel filters Replace fuel filters.
Stale or contaminated fuel Drain tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged Remove obstructions from lines.
Air in fuel system Prime fuel system.
Faulty wire connections Check wire connections.
Electronic fuel system fault
Have the electronic fuel system checked by a Mercury Diesel authorized repair
facility.
Engine Runs Rough, Misses, or Backfires
Possible Cause
Remedy
Clogged fuel or air filters Replace fuel or air filters.
Stale or contaminated fuel If fuel is contaminated, drain tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged Remove obstructions from lines.
Air in fuel system Prime fuel system.
Electronic fuel system faulty Have electronic system checked by a Mercury Diesel authorized repair facility.
Poor Performance
Possible Cause
Remedy
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 Clean strainer or 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.
Section 7 - Troubleshooting
Page 82 90-8M0117076 eng FEBRUARY 2018
To Next Page
Loading...
Need help?
General