TROUBLE SHOOTING
US / WHISPER 15 ULTRA - Three Phase / December 2008 / Copyright © 2008 Mastervolt 33
PROBLEM CAUSE SOLUTION
Engine exhaust smokes
• Faint blue smoke - generally the result
of light load
Increase load.
• Heavy blue smoke - caused by
lubricating oil: Overfull oil sump or worn
cylinder bore, stuck broken or worn
rings.
Check the oil level.
Check the compression.
• Black smoke –incomplete combustion
caused by: Overload, choked air filter,
inlet temperature too high, unsuitable
fuel or water in fuel.
Check the fuel .
Check for overload.
Engine starts, but stops after 10
up to 30 seconds
• Protection system stops the engine;
this can be caused by oil pressure
failure, lack of cooling water (exhaust
temperature alarm). Overload, loose
wire or faulty alarm switch. Digital
Diesel Control will help to indicate
failure.
Refer to paragraph 2.5.5. and 3.2.2 for
information on the alarm system. Bypassing the
switches can help to confirm the failure.
• Overload or short circuit.
Switch off the consumers and test for short circuit.
• Lack of fuel.
Check fuel supply system: fuel lines, pump, filter,
valves, tank level, etc.
• Oil pressure low. (oil pressure switch
tripped).
Check oil level.
Check engine’s oil pressure and have it repaired
by Mastervolt.
• Excessive heat in cooling system
(thermo-switch tripped).
• Lack of cooling water (exhaust switch
tripped).
• Impeller broken.
• Cooling water blocked.
• Water strainer blocked.
• Air or water in the fuel.
• Blocked air or fuel filter.
Check cooling water system flow: water pump,
inlet water filter, coolant flow.
• Loss of compression by wear out or
damage.
Repair by Mastervolt service.
• V-belt broken or loose.
Readjust or replace V-belt
Engine stops by itself
• Thermostat faulty
Check thermostat and replace
• Generator is being overloaded. Digital
Diesel Control will indicate “
HIGH
CURRENT
”.
Check electrical load and switch off some
consumers
• Insufficient intake air.
• Choked air filter.
Check intake air paths and filter, clean and
replace if necessary.
• Fuel injector faulty.
Replace injector.
• Valve clearance incorrect.
Readjust valve clearance
• Poor fuel quality.
Use better quality diesel.
• Poor quality lubricating oil.
Use better quality oil.
Sooty, black exhaust.
• Continuous running with very low load.
Increase load and have the engine run for a few
hours
● Wrong measurement. Check if the load is measured correctly. Does the Amp meter show
the correct value? When calculating the load by multiplying voltage and amps this should be
done by using the exact values, taking into account the power factor of the consumers. When
any doubt, measure the power directly with an appropriate instrument.
• Overfull oil sump.
Bring the oil to the correct level
• Choked fuel filter.
Replace the fuel filter.
• Choked air filter.
Check air inlet openings; clean air filter.
• Exhaust blocked.
Check the exhaust system.
• Injector blocked.
Have the injector checked.
• Loss of compression, sticking or
damaged piston ring.
Have the compression measured.
Clean or replace the rings.
Loss of power
• Wear out of cylinder.
Have the compression measured and have the
engine overhauled.
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