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SECTION 5: TROUBLESHOOTING
ENGINE TROUBLESHOOTING
When Engine is Difficult To Start
Cause Countermeasures
Fuel is thick and doesn’t flow - Check the fuel tank and fuel filter.
- Remove water, dirt and other impurities.
- Check the fuel filter element for water, dirt , or other impurities, and
replace the filter if necessary.
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 cap nut, etc.
- Loosen air vent screw over fuel filter and fuel injection pump to eliminate
all the air in the fuel system.
Thick carbon deposits on orifice of
injection nozzle
- 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. If not, install a new nozzle.
Valve clearance is wrong - Adjust valve clearance:
Intake — 0.0098 in. (0.25mm)
Exhaust — 0.0118 in. (0.3mm)
Leaking valves - Grind valve
Fuel injection timing is wrong - Adjust injection timing.
- The injection timing is 18° before top dead center.
Engine oil becomes thick in cold
weather and engine cranks slowly.
- Change grade of oil according to the weather (ambient 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 the winter, always remove battery from tractor, fully charge, and keep
indoors. Install in tractor at time of use.