TROUBLE SHOOTING
34 Copyright © 2008 Mastervolt / December 2008 / Whisper 12 Ultra - Three phase for mobile applications/ EN
PROBLEM CAUSE SOLUTION
• Faulty electronic governor
Replace faulty parts.
• Too much oil.
Drain oil to proper level
• Lack of fuel.
Check fuel supply system: fuel pump and filter.
• Lack of intake air.
Check air intake.
• Choked exhaust system, exhaust
blocked.
Check the exhaust piping; inspect manifold inside
• Generator overloaded
Reduce the electrical load (switch off some
consumers).
• Defective generator (windings,
bearings or other)
Generator must be sent to manufacturer for repair
of damaged bearing or winding.
Engine speed drops
• Damaged engine
Repair by Mastervolt service
Engine does not stop on
command
• Fuel solenoid is not switching off •
• Loss of control
Faulty Digital Diesel Control unit. Stop the engine
manually by the stop handle.
Check wire connections to stop solenoid. Check
solenoid valve function. Replace if necessary
• 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.
Engine exhaust smokes
• Black smoke –incomplete combustion
caused by: Overload, choked air filter
element, inlet temperature too high,
unsuitable fuel or water in fuel.
Check the fuel .
Check for overload.
Check the air intake
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. 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.
Check cooling liquid level in expansion tank;
check coolant flow, coolant pump,.
Check if the radiator fan works properly and
switch to higher speed. Air piping system might
block circulation. Almost all problems of
overheating are caused by faulty installation:
bents in the routing of cooling pipes that capture
air bubbles (air locks) or hot air circulating bacj
into the radiators. Refer to installation manual.
• Air or water in the fuel.
• Blocked air or fuel filter.
Check and clean
• 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 element.
Check intake air paths and filter, clean and
replace if necessary.
• Fuel injector faulty.
Replace injector.
Sooty, black exhaust.
• Valve clearance incorrect.
Readjust valve clearance
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