Section 6 - Troubleshooting
Page 72
90-8M0114081
eng
DECEMBER 2015
Troubleshooting
The broad network of Mercury Diesel service partners with trained professionals, modern equipment, and all of the required
special tools is available to you for the care and service of your Mercury Diesel engine. If repairs must be made, the engine
should be brought to an authorized Mercury Diesel repair facility. However, if you experience starting or running problems while
on the water, the following troubleshooting charts can help you remedy some simple problems.
Troubleshooting Charts
Starter Motor Will Not Crank Engine, or Cranks Slow
Possible Cause
Remedy
Battery switch turned off.
Turn switch on.
Remote control not in neutral position.
Position control lever in neutral.
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 battery.
Test and replace if bad.
Engine Will Not Start, or Is Hard to Start
Possible Cause
Remedy
Lanyard stop switch activated.
Check lanyard stop switch.
Improper starting procedure.
Read starting procedure.
Empty fuel tank or fuel shut off valve closed.
Fill tank or open valve.
Faulty mechanical fuel delivery pump.
Have pump replaced by a Mercury Diesel–authorized repair facility if
fuel is present.
Throttle not operating properly.
Check the throttle for freedom of movement.
Faulty electrical stop‑circuit.
Have a Mercury Diesel–authorized repair facility service the electrical
stop circuit.
Clogged fuel filters.
Replace the filters.
Stale or contaminated fuel.
Drain tank. Fill with fresh fuel.
Fuel line or tank vent line kinked or clogged.
Replace kinked lines or blow out the lines with compressed air to
remove obstruction.
Air in fuel injection system.
Purge fuel injection system.
Faulty wire connections.
Check wire connections.
Glow plugs or glow plug system inoperative, if
equipped.
Have a Mercury Diesel–authorized repair facility service the glow plug
system.
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
Throttle not operating properly.
Check the throttle for binding or an obstruction.
Idle speed too low.
Check idle speed and adjust, if necessary.
Clogged fuel or air filters.
Replace the filters.
Stale or contaminated fuel.
Drain tank and fill with fresh fuel.
Kinked or clogged fuel line or fuel tank vent line. Replace kinked lines or blow out lines with compressed air to remove
obstruction.
Air in fuel system.
Purge fuel injection system.
Electronic fuel system faulty.
Have electronic system checked by a Mercury Diesel–authorized repair
facility.
Summary of Contents for TDI 4.2L
Page 6: ...Page iv 90 8M0114081 eng DECEMBER 2015...
Page 34: ...Section 2 On The Water Notes Page 28 90 8M0114081 eng DECEMBER 2015...
Page 72: ...Section 4 Maintenance Notes Page 66 90 8M0114081 eng DECEMBER 2015...
Page 82: ...Section 6 Troubleshooting Notes Page 76 90 8M0114081 eng DECEMBER 2015...
