25
TROUBLESHOOTING
ENGLISH
TROUBLESHOOTING
If the engine does not function properly, use the following chart to identify and correct the cause.
B
When it is difficult to start the engine
B
When 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 joint bolt stop fuel filter and air
vent screws 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
wrong.
*Adjust valve clearance to 0.18 to
0.22mm(0.007 to 0.0087 in.) when the
engine is cold.
Leaking valves
*Grind valve.
Fuel injection timing
is wrong.
*Adjust injection timing
*The injection timing 0.31 rad(18 )
before top dead center.
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.
*Adjust timing 0.31 rad(18 ) before top
dead center.
Valve clearance is
wrong.
*Adjust to proper valve clearance of
0.18 to 0.22 mm(0.007 to 0.0087 in.)
with engine cold.
Air cleaner is dirty
*Clean the element every 100 hours of
operation.
Fuel injection
pressure is wrong.
*Adjust to proper pressure. 13.7Mpa
(140 kgf/cm ; 1991 psi)
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, contact your KUBOTA dealer.
1ABK0000132.book 25 ページ ２００４年２月１９日 木曜日 午前１０時３０分
