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TROUBLESHOOTING
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
Cause
*
Check the fuel tank and fuel filter.
*
Remove water, dirt and other
impurities.
Fuel is thick and
*
As all fuel will be filtered by the filter,
doesn't flow.
if there should be water or other
foreign matters on the filter, clean the
filter with kerosene.
*
If air is in the fuel filter or injection
lines, the fuel pump will not work
properly.
*
To attain proper fuel injection
Air or water mixed
pressure, check carefully for
in fuel system
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.
* Adjust valve clearance to 0.145 to
Valve clearance is
0.185 mm (0.0057 to 0.0073 in.)
not as specified.
when the engine is cold.
Leaking valves
* Grind valve.
Fuel injection
timing is not as
* Check injection timing.
specified.
Engine oil
becomes thick in
* Change grade of oil according to the
cold weather and
weather (temperature).
engine cranks
slow.
* Bad valve or excessive wear of rings,
pistons and liners cause insufficient
Low compression
compression. Replace with new
parts.
*
Charge battery.
Battery is
*
In winter, always remove battery from
discharged and the
machine, charge fully and keep
engine will not
indoors. Install in machine at time of
crank.
use.
A If the cause of trouble can not be found, contact your KUBOTA dealer.
Countermeasures
BWhen output is insufficient
Cause
*
Bad valve and excessive wear of rings,
Compression is
pistons and liners cause insufficient
insufficient.
compression. Replace with new parts.
Leaking valves
*
Grind valves.
Fuel is insufficient.
* Check fuel system.
*
Check lubricating oil system.
*
Check to see if lubricating oil filter is
working properly.
*
Filter element deposited with impurities
Overheating of
would cause poor lubrication. Change
moving parts
element.
*
Check the clearance of bearing are
within factory specs.
*
Check injection timing.
*
Adjust timing
Valve clearance
* Adjust to proper valve clearance of
is not as
0.145 to 0.185 mm (0.0057 to 0.0073
specified.
in.) with engine cold.
Air cleaner is
* Clean the element every 100 hours of
dirty
operation.
Fuel injection
* Check injection pressure.
pressure is not
18.6 MPa(190 kgf/cm )
as specified.
*
Do not use poor quality fuel as it will
cause wear of the pump. Only use No.
2-D diesel fuel. (See "FUEL" in
Injection pump
"PERIODIC SERVICE" Section.)
wear
*
Check the fuel injection pump element
and delivery valve assembly and
replace as necessary.
Countermeasures
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