24 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 air vent screws stop fuel filter
and fuel injection pump to eliminate all
the air in the fuel system.
Valve clearance is
wrong.
* Adjust valve clearance to 0.145 to
0.185 mm (0.0057 to 0.0072 in.) when
the engine is cold.
Leaking valves * Grind valve.
Fuel injection timing
is wrong.
* 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
wrong.
* Adjust to proper valve clearance of
0.145 to 0.185 mm (0.0057 to 0.0072
in.) with engine cold.
Air cleaner is dirty
* Clean the element every 100 hours of
operation.
Fuel injection
pressure is wrong.
* Check injection pressure.
13.7 Mpa (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. (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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