28 TROUBLESHOOTING
ENGLISH
TROUBLESHOOTING
If the engine does not function properly, use the following chart to identify and correct the cause.
BWhen it is difficult to start the engine BWhen output is insufficient
Cause Countermeasures
Fuel is thick and
doesn't flow.
*Check the fuel tank and fuel filter.
*Remove water, dirt and other
impurities.
*As all fuel will be filtered by the filter, if
there should be water or other foreign
matters on the filter, clean the filter
with kerosene.
Air or water mixed
in fuel system
*If air is in the fuel filter or injection lines,
the fuel pump will not work properly.
To attain proper fuel injection
pressure, check carefully for loosened
fuel line coupling, loose cap nut, etc.
*Loosen air vent plug of fuel filter and
air vent cock of fuel injection pump to
eliminate all the air in the fuel system.
Thick carbon
deposits on orifice
of injection nozzle.
*This is caused when water or dirt is
mixed in the fuel. Clean the nozzle
injection piece, being careful not to
damage the orifice.
*Check to see if nozzle is working
properly or not. If not, install a new
nozzle.
Valve clearance is
not as specified.
*Adjust valve clearance when the
engine is cold.
Leaking valves *Grind valve.
Fuel injection
timing is not as
specified.
*Check injection timing.
Engine oil
becomes thick in
cold weather and
engine cranks
slow.
*Change grade of oil according to the
weather (temperature.)
Low compression
*Bad valve or excessive wear of rings,
pistons and liners cause insufficient
compression. Replace with new parts.
Battery is
discharged and the
engine will not
crank.
*Charge battery.
*In winter, always remove battery from
machine, charge fully and keep
indoors. Install in machine at time of
use.
Cause Countermeasures
Carbon stuck
around orifice of
nozzle piece
*Clean orifice and needle valve, being
very careful not to damage the nozzle
orifice.
*Check nozzle to see if good. If not,
replace with new parts.
Compression is
insufficient.
Leaking valves
*Bad valve and excessive wear of rings,
pistons and liners cause insufficient
compression. Replace with new parts.
*Grind valves.
Fuel is
insufficient.
*Check fuel system.
Overheating of
moving parts
*Check lubricating oil system.
*Check to see if lubricating oil filter is
working properly
*Filter element deposited with impurities
would cause poor lubrication. Change
element.
*Check the clearance of bearing are
within factory specs.
*Check injection timing.
Valve clearance
is not as
specified.
*Adjust to proper valve clearance when
the engine is cold.
Air cleaner is
dirty
*Clean the element every 100 hours of
operation.
Fuel injection
pressure is not
as specified.
*Check injection pressure.
Injection pump
wear
*Do not use poor quality fuel as it will
cause wear of the pump. Only use
No. 2-D diesel fuel.
*Check the fuel injection pump element
and delivery valve assembly and replace
as necessary.
A If the cause of trouble can not be found or if you can not adjust by yourself, contact your KUBOTA dealer.
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