Yanmar L48N Operation Manual page 92

TROUBLESHOOTING
SYMPTOM
Indicator Stays On - Key Switch is Turned from Start to ON (START → ON)
• Battery indicator stays On
• Engine oil pressure indicator
stays On
Engine Does Not Start
• Starter motor operates but
engine does not start
• Starter motor does not
operate or rotates too slowly
(engine can be turned
manually)
• Engine cannot be manually
turned
White or Black Exhaust Smoke
• Black exhaust smoke
80
PROBABLE CAUSE
• Faulty alternator
• Faulty engine oil pressure
switch
• No diesel fuel
• Improper diesel fuel
• Clogged fuel filter
• Poor fuel injection
• Compressed air leakage from
intake / exhaust valves
• Faulty engine stop solenoid (if
equipped)
• Battery needs charging
• Faulty cable connection at
• battery terminals
• Faulty starter switch
• Faulty starter motor
• Inner parts seized or damaged
• Engine overloaded
• Clogged air cleaner element
• Improper diesel fuel
• Faulty spraying of fuel
injection
• Excessive intake / exhaust
valve clearance
ACTION
• See authorized Yanmar
industrial engine dealer or
distributor
• Refuel fuel system
• Replace with recommended
diesel fuel
• Replace fuel filter
• See authorized Yanmar
industrial engine dealer or
distributor
• Check electrolyte, recharge
• Clean terminals, retighten
• See authorized Yanmar
industrial engine dealer or
distributor
• Reduce load
• Clean element or replace
• Replace with recommended
diesel fuel
• See authorized Yanmar
industrial engine dealer or
distributor
L-N Operation Manual
REFER TO
—
—
Filling the Fuel
Tank on page 25
Diesel Fuel
Specifications on
page 24
Drain the Fuel Tank
and Replace Outlet
Fuel Filter on page 73
—
—
—
Check Battery (If
Equipped) on page 61
—
—
—
—
—
Clean Air Cleaner
Element on page 71
Diesel Fuel
Specifications on
page 24
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