39TROUBLESHOOTING
ENGLISH
TROUBLESHOOTING
If the engine does not function properly, use the following chart to identify and correct the cause.
When it is difficult to start the engine 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.
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
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
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. (See "FUEL" in
"PERIODIC SERVICE" Section.)
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.
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