16
MAINTENANCE
SYMPTOM
POSSIBLE CAUSE
SOLUTION
Indicator Stays On – Key Switch is Turned from Start to ON (START
→
ON)
Engine oil pressure
indicator stays On
Faulty engine oil pressure
switch
See authorized Yanmar
industrial engine dealer or
distributor
Engine Does Not Start
Starter motor operates
but engine does not
start
No diesel fuel
Refuel fuel system
Improper diesel fuel
Replace with recommended
diesel fuel
Clogged fuel filter
Replace fuel filter
Poor fuel injection
See authorized Yanmar
industrial engine dealer or
distributor
Compressed air leakage from
intake / exhaust valves
Faulty engine stop solenoid (if
equipped)
Engine cannot be
manually turned
Inner parts seized or damaged
See authorized Yanmar
industrial engine dealer or
distributor
White or Black Exhaust Smoke
Black exhaust smoke
Engine overloaded
Reduce load
Clogged air cleaner element
Clean element or replace
Improper diesel fuel
Replace with recommended
diesel fuel
White or Black Exhaust Smoke
Black exhaust smoke
Faulty spraying of fuel
injection
See authorized Yanmar
industrial engine dealer or
distributor
Excessive intake / exhaust
valve clearance
White exhaust smoke
Improper diesel fuel
Replace with recommended
diesel fuel
Faulty spray pattern of fuel
injection
See authorized Yanmar
industrial engine dealer or
distributor
Fuel injection timing delay
Engine burning oil
