Kioti DK451, Owner'S Manual

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8-2 DK451/501/551
WHEN ENGINE IS DIFFICULT TO START
ENGINE TROUBLESHOOTING
Fuel is thick and doesn’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 discharged and the engine will
not crank
Cause Countermeasures
- 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 (when the engine is cold)
inlet N/A: 0.25 mm (0.0098 in.), Turbo: 0.2 mm (0.0079 in.)
exhaust N/A: 0.3 mm (0.0118 in.), Turbo: 0.2 mm (0.0079 in.)
- Grind valve
- Adjust injection timing.
- The injection timing (before top dead center)
DK451: 18° (0.3 rad), DK501/551: 12° (0.21 rad)
- Change grade of oil according to the weather (temperature).
- Bad valve or excessive wear of rings, pistons and liners cause insuffi
cient compression. Replace with new parts.
- Charge battery.
- Use decompression device.
- In winter, always remove battery from tractor, charge fully and keep
indoors. Install in tractor at time of use.