- When engine is difficult to start - When output is insufficient
11.1 Engine troubleshooting
Cause Countermeasures
Fuel is thick and
dosen’t flow
Air or water
mixed in fuel
system
Thick carbon
deposits on
orifice of
injection nozzle.
Valve clearance
is wrong
Leaking valves
Fuel injection
timing is wrong
Engine oil
become thick in
cold weather
and engine
cranks slow.
Low
compression
Battery is
discharge and
the engine will
not crank.
* 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 of other foreign
matters on the filter, replace the filter.
* 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 cap nut, etc.
* Loosen air vent screw over fuel filter
and fuel injection pump to eliminate all
the air in the fuel system.
* 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.
* Adjust valve clearance inlet 0.0098
in.(0.25 mm), exhaust 0.0118 in. (0.3
mm) when the engine is cold.
* Grind valve
* Adjust injection timing.
* The injection timing (before top dead
c e n t e r )
DK45 : 18
o
(0.3 rad)
DK50 : 20
o
(0.35 rad)
* Change grade of oil according to the
weather (temperature).
* Bad valve or excessive wear of rings,
pistons and liners cause insufficient
compression. Replace with new parts
.
* Charge battery.
* Use decompression device.
* In winter, always remove battery from
tractor, charge fully and keep i n d o o r s .
Install in tractor at time of use.
Cause Countmeasures
Carbon struck
around orifice of
nozzle piece
Compression is
insufficient leaking
v a l v e s
Overheating of
moving parts
Valve out of
a d j u s t m e n t
Air cleaner is dirty
Fuel injection
pressure is wrong
Injection pump
w e a r
* Clean orifice and needle valve, being
very careful not to damage the
nozzle orifice.
* Check nozzle.
If defective, replace with new parts.
* Band valve and excessive wear of
rings, pistons and liners cause
insufficient compression. Replace
with new parts.
* Grind valves.
* Check lube oil system.
* Check to see if lube oil filter is
working properly.
* Filter screens or elements deposited
with impurities would cause poor
lubrication Clean screens.
* Check to see if bearing clearance
are within factory specs.
* Check engine timing.
*
Adjusting timing (before top dead center)
DK45 : 18
o
(0.3 rad)
DK50 : 20
o
(0.35 rad)
* Adjust to proper valve clearance of
inlet 0.0098 in. (0.25 mm), exhaust
0.0118 in. (0.3 mm) with engine cold.
* Clean the element every 100-200
hours of operation.
* Adjust to proper pressure of 2000
psi(140 kgf/cm
2
, 13.7MPa)
* Do not use poor quality fuel for it will
cause wear of the pump. Only use
No. 2 diesel fuel.
* Check the fuel injection pump
element and delivery valve assembly
and replace as necessary.
11. Troubleshooting
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