TROUBLESHOOTING
TESTING AND ADJUSTMENT
Problem
Cause
Correction
2. MISFIRING OR
RUNNING
Leak or Break in Fuel Line Between
Install a new fuel line.
ROUGH (CONT.)
Injection Pump and Injection Valve
Wrong Valve Clearance
Make adjustment according to Specifications.
Defect in Fuel Injection Nozzle
Run engine at rpm that gives maximum misfiring or rough running. Then loosen a
fuel line nut on the injection line for each cylinder, one at a time. Find the cylinder
where loosening the fuel line nut does not change the way the engine runs. Test the
fuel injection nozzle for that cylinder. Install new parts where needed.
Wrong Fuel Injection Timing
Make adjustment to timing.
3.
STALL AT LOW RPM
Fuel Pressure is Low
Make sure there is enough fuel in the fuel tank. Look for leaks or bad bends in the
fuel line between fuel tank and fuel transfer pump. Look for air in the fuel system.
Check fuel pressure. The outlet pressure of the fuel transfer pump at full load speed
is 30 5 psi (2.1 0.4 kg/cm2).
If fuel pressure is lower than above pressure, install a new fuel filter element.
Inspect the bypass valve for free movement. Install a new bypass valve if
necessary.
Idle rpm Too Low
Make adjustment to governor so idle rpm is the same as given in the RACK
SETTING INFORMATION.
Defect in Fuel Injection Nozzle
Install a new fuel injection nozzle.
Wrong Valve Clearance
Make adjustment according to Specifications.
Spring for Dashpot
Governor
Install spring correctly.
Installed Wrong
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