EN / WHISPER 6 /12 Mobile / November 2004 27
• Fuel lift pump is not working. Check fuel filter and fuel lift pump: clean or
• Fuel filter is blocked. replace if necessary.
• Air in fuel lines. Bleed air from fuel system (refer to maintenance
section).
• Wrong valve clearance. Adjust valve clearance.
• Low compression because of dirty valves. Clean valves. Take off the injection bent and
inspect the outlet port. When little carbon is in the
port one can clean the valve by taking of the valve
spring and rotate the valve. When the outlet port
is strongly affected by carbon, the generator
system is not properly used. and is running for
long periods at too low load.
• Blocked injector. Have the injector tested and cleaned if necessary.
• Loss of compression by wear out Repair by Mastervolt service.
or damage
Engine runs irregularly. • Unsuitable contaminated fuel Fill up with fuel or replace by better quality.
• Lack of fuel.
• Choked fuel filter. Check fuel filter and fuel lift pump: clean or
replace if necessary.
• Faulty fuel lift pump. Check and repair.
• Choked air filter. Check the air intake.
• Lack of air.
• Choked exhaust system, exhaust blocked, Check the exhaust piping; inspect manifold inside.
• Air in the fuel pipes. Bleed air from fuel system (refer to maintenance
section).
• Blocked injector. Have the injector tested and cleaned if necessary.
• Wrong valve clearance. Adjust valve clearance.
• Temporarily hunting (this will disappear when engine has run in).
Engine speed drops. • 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 the manifold
and mufflers inside.
• Generator overloaded. Reduce the electrical load (switch off some
consumers).
• Generator over energised. Check that the proper capacitors type are
installed and that they are connected correctly.
• Defective generator (windings, bearings, Generator must be sent to manufacturer for repair
or other). of damaged bearing or winding.
• Damaged engine. Repair by Mastervolt service.
Engine does not stop • Fuel solenoid is not switching off. Stop the engine manually by the stop handle.
on command. • Loss of control Check wire connections to solenoid.
Replace if necessary faulty solenoid or DDC unit.
Engine exhaust smokes • Faint blue smoke - Increase load.
generally the result of light load
• Heavy blue smoke - Check the oil level.
caused by lubricating oil: Check the compression.
Overfull oil sump or worn cylinder bore,
stuck broken or worn rings.
• Black smoke - Check the fuel .
incomplete combustion caused by: Check for overload.
Overload, choked air filter, inlet temperature
too high, unsuitable fuel or water in fuel.
MAINTENANCE
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