57 4. Idling is rough. (1) Movement of central rack is defective. 1) Stiff plunger movement or sticking. Repair or replace 2) Rack and pinion fitting is defective. Repair 3) Movement of governor is improper. Repair 4) Delivery holder is too tight. Inspect and adjust (2) Uneven injection volume. Adjust (3) Injection timing adjustment failure. Adjust (4) Plunger is worn and fuel injection adjustment is difficult. Replace (5) Governor spring is too weak. Replace (6) Feed pump can't feed oil at low speeds. Repair or replace (7) Fuel supply is insufficient at low speeds due to clogging of fuel filter. Disassemble and clean, or replace element (8) Weight abnormality. Replace (9) Shifter is worn.
Replace governor. (10) Air sucking. Check piping. (11) Torochid pump is defective. Replace (12) Governor is worn. Replace or adjust. 5. Engine runs at high speeds, but cuts out at low Speeds. (1) The wire or rod of the accel is caught. Inspect and repair (2) Control rack is caught and can't be moved. Inspect and repair (3) Low idling stopper bolt is abnormal. Replace or adjust. 6. Engine doesn't reach max, rpm. (1) Governor spring is broken or excessively worn. Replace (2) Injection performance of nozzle is poor. Repair or replace (3) Trochiod pump is defective. Replace (4) Accumulator is abnormal. Replace (5) Filter and pipe are clogged. Check piping. (6) Governor is abnormal. Replace 7.
Loud knocking. (1) Injection timing is too fast or too slow. Adjust (2) Injection from nozzle is improper fuel drips after each infection. Adjust (3) Injection nozzle starting pressure is too high. Adjust (4) Uneven injection. Adjust (5) Engine overheats, or insufficient compression. Repair 8.Engine exhausts too much smoke. When exhaust smoke is black: (1) Injection timing is too fast. Adjust (2) Air volume intake is insufficient. Inspect and repair (3) The amount of injection is uneven. Adjust (4) Injection from nozzle is improper. Repair or replace When exhaust smoke is white: (1) Injection timing is too slow. Adjust (2) Water is mixed in fuel.
Inspect fuel system, and clean (3) Shortage of lube oil m the engine. Repair (4) Engine is over-cooled. Inspect