TROUBLE SHOOTING
EN / W-SC6/10 for mobile applications / September 2008
31
PROBLEM
CAUSE
SOLUTION
Engine speed drops
Faulty electronic governor
Replace faulty parts. Contact Whisper Power
service department for advice
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).
Generator over energised.
Check that the proper capacitor type is installed
and that it is connected correctly.
Defective generator (windings,
bearings or other)
Generator must be sent to manufacturer for repair
of damaged bearing or winding.
Damaged engine
Repair by Whisper Power 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
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.
Engine stops by itself
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 Whisper Power.
Excessive heat in cooling system
(thermo-switch tripped).
Lack of cooling water (exhaust switch
tripped).
Impeller broken.
Cooling water blocked.
Check cooling water system flow: water pump,
coolant flow.
Air or water in the fuel.
Blocked air or fuel filter.
Check and clean
Loss of compression by wear out or
damage.
Repair by Whisper Power service.
V-belt broken or loose.
Readjust or replace V-belt
Thermostat faulty
Check thermostat and replace
Sooty, black exhaust.
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
