56 Nozzle doesn't work. (1) Nozzle valve doesn't open or close normally. Repair or replace (2) Nozzle seat is defective. Repair or replace (3) Case nut is loose. Inspect and tighten (4) Injection nozzle starting pressure is too low. Adjust (5) Nozzle spring is broken. Replace (6) Fuel oil filter is clogged. Repair or replace (7) Excessive oil leaks from the nozzle sliding area. Replace the nozzle assembly (8) Deformation due to excessive tightening of nozzle retaining bolt. Replace or adjust. (9) Strainer is clogged. Replace or clean Injection timing is defective. (1) Injection timing is retarded due to failure of the coupling. Adjust (2) Camshaft is excessively worn.
Replace camshaft (3) Roller tappet incorrectly adjusted or excessively worn. Adjust or replace (4) Plunger is excessively worn. Replace plunger assembly (5) Bad installation of injection pump. Adjust. (6) Air sucking. Bleed air. (7) Delivery valve is defective. Replace. 2. Engine starts, but immediately stops. (1) Fuel pipe is cogged. Clean (2) Fuel filter is clogged. Disassemble and clean, or replace the element. (3) Improper air-tightness of the fuel pipe connection, or pipe is broken and air is being sucked in. Replace packing; repair pipe (4) Insufficient fuel delivery from the feed pump. Repair or replace. (5) Trochoid pump is defective. Replace. (6) Air sucking.
Bleed air or hose check. (7) Electromagnetic feed pump is clogged. Replace. (8) Out of fuel. Fill the fuel. (9) Stop solenoid is defective. Replace. (10) Accumulator is abnormal. Replace. 3.Engine's output is insufficient. Defective injection timing, and other failures. (1) Knocking sounds caused by improper (too fast) injection timing. Inspect and adjust (2) Engine overheats or emits large amount of smoke due to improper (too slow) injection timing. Inspect and adjust (3) Insufficient fuel delivery from feed pump. Repair or replace (4) Torochoid pump is defective. Replace. (5) Type of fuel is incorrect. Check and refill proper fuel. (6) Fuel tempererture is high. Cool.
Nozzle movements is defective (1) Case nut loose. Inspect and retighten (2) Defective injection nozzle performance. Repair or replace nozzle (3) Nozzle spring is broken. Replace (4) Excessive oil leaks from nozzle. Replace nozzle assembly Injection pump is defective. (1) Max. delivery limit bolt is screwed in too far. Adjust (2) Plunger is worn. Replace (3) Injection amount is not uniform. Adjust (4) Injection timings are not even. Adjust (5) The 1st and 2nd levers of the governor and the control rack of the injection pump are improperly lined up. Repair (6) Delivery holderr is loose Inspect and retighten (7) Delivery packing is defective.
Replace packing (8) Delivery valve seat is defective. Repair or replace (9) Delivery spring is broken. Replace (10) Carbon deposit is adhered. Clean (11) Spray pattern is abnormal. Replace (12) Nozzle crack. Replace (13) Plunger barrel crack. Replace fuel injection pump.