22 TROUBLESHOOTING
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
eng
in
e • When
output
is
insufficient
Cause Countermeasures Cause Countermeasures
*C
heck
the fuel tank
and
fuel filt
er
. *Clean orifi
ce
and needle va
lv
e, being
*Remove wate
r,
dirt
and
other
Impurities. Carbon stuck very careful not
to
damage the nozzle
Fuel
is thick and *As all fuel will be filtered by the filter,
if
around orifice
of
orifice.
doesn't now. there should be
water
or
other foreign nozzle piece "Check nozzle
to
see
if
good.
If
not
matters
on
the filter, clean the filter with replace with new parts.
kerosene.
*If air Is in the fuel filter
or
injection lines,
the fuel pump will
not
work properly.
To
attain proper fuel Injection pressure,
Compression
is
*Bad valve and excessive wear
of
rings.
insufficient.
pistons and liners cause insufficient
Leaking valves
compression. Replace with new parts.
*Grind valves.
Ai
r
or
water mixed check carefully
for
loosened fuel line
in fuel system coupling, loose
cap
nut,
etc
.
Fuel is insufficient. "Check fuel system.
*loosen
air vent screws stop fuel filter
and fuel injection
pump
to
eliminate all
the
air
in the fuel system.
*Check lubricating oil system.
"Check
to
see
if
lubricating oil filter is
working properly.
*This is caused when water
or
dirt is
mixed
In
the fuel. Cl
ean
the nozzle
Thick
carbon injection piece, being careful
not
to
deposits
on
orifice damage the orifice.
of
injection nozzle. *Check
to
see
if
nozzle
is
working
properly
or
nol
If
not. install a
new
nozzle.
*Filter element deposited with impurit
ie
s
Overheating
of
would cause
poor
lubrication. Change
element.
moving parts
*Check the clearance
of
bearing
are
within factory specs.
*Check injection timing.
*Adjust timing 0.366 rad(20°) before top
dead center.
Valve clearance
Is
•Adjust valve clearan
ce
to
0.
145-
0.185mm(0.0057-0.0072in) when the
wrong.
engine is cold.
Valve clearance is
"Adjust
to
proper valve clearance
of
wrong.
0.145 to 0.185 mm(0.0057 to 0.0072 in.)
with engine cold.
Leaking valves "Grind valve.
Fuel
injection timing
•Adjust injection timing
•
The
injection timing Is 0.366 rad(20
")
is wrong.
before top dead center.
Air
cleaner
is
dirty
*Clean the element every 100
hours
of
operation.
Fuel injection •Adjust to proper pressure. 13.
7Mpa
pressure Is wrong. (140 kgf/cm
';
1991 psi)
Engine oll becomes
thick in cold *Ch
ange
grade
of
oil according
to
the
weather
and
engine weather (temperat
ure
.)
cranks slow.
*Do not use poor quality fuel
for
It will
cause wear
of
the pump. Only
use
No.
Injection
pump
2-D
diesel fuel.
wear
*Check the fuel injection pump element
*Bad valve
or
excessive
wear
of
rings,
and delivery valve assembly
and
Low
compression
pis
tons and liners
cause
insufficient
replace
as
necessary.
compression. Replace with new parts.
Battery
is
"Charge battery.
discharged and the *In winter, always remove battery from
engine will not machine, charge fully and keep indoors.
crank. Install
in
machine
at
time
of
use.
NOTE:
• If the cause
of
trouble can
not
be
found, contact your KUBOTA dealer.
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