Yanmar BY series, Service Manual

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TROUBLESHOOTING
13-6
BY Service Manual
Troubleshooting Chart
TROUBLESHOOTING CHART
Starting Trouble
Exhaust Color
Problem / Symptom Cause Action
Engine Will Not Crank
Discharged battery Charge / replace battery
Blown fuse Replace fuse
Defective starter motor Replace starter motor
Loose wiring connections Tighten connections
Electrical panel power circuit breaker
tripped
Reset circuit breaker
Engine Cranks but Will Not Start
No fuel to engine
Check fuel level in tank
Ensure all valves are on
No fuel to cylinders
Clean or replace clogged pre-filter (if
equipped)
Clean or replace fuel filter / water
separator
Replace clogged fine filter
Bleed fuel system
Blown fuse - F3, F4, F5
ECU / software problem
Low ambient temperature
Install optional glow plug control
Install block heater
Oil viscosity too high
Replace with correct viscosity oil for
operating conditions
Problem / Symptom Cause Action
White Smoke
Cold engine
Allow engine to warm to operating
temperature
Defective thermostat
Incorrect fuel Replace fuel with correct type
Defective (leaking) fuel injector Test / replace fuel injector
Injection timing is incorrect ECU / software problem
White Smoke with Water Vapor
Leaking cylinder head gasket Repair
Leaking charge air cooler
Repair as necessary Cracked cylinder head
Cracked cylinder
Blue Smoke
Worn piston rings / cylinders
Repair as necessary
Oil leak in turbocharger (oil present in
intake manifold)
Damaged piston cooling nozzles