Maintenance

The injection pump and fuel transfer pump are relatively trouble-free and if properly maintained will usually not require major service repairs between engine overhauls.

Contamination is the most common cause of fuel system problems. Therefore, to ensure best operating results, the fuel must be clean and fuel tanks must be free of contaminants. Change the fuel filter/water separator regularly, inspect/clean the fuel pre-strainer, and clean the inlet strainer on the inlet side of the fuel transfer pump.

Important Do not open the fuel system unless required.
Note The injection nozzles must be cleaned and tested (and repaired if necessary) at least every 9,000 hours. Normal conditions are considered to be the use of clean high quality fuel, blended oils are not recommended, and regular maintenance of the fuel system according to the Maintenance Inspection Schedule. Refer to the Engine Overhaul Manual TK 50136 for injection nozzle testing and repair procedures.
Note Use only diesel fuel that conforms to EN590 standard.

Whenever the fuel system is opened, take the following precautions to prevent dirt from entering the system:

  • Cap all fuel lines.

  • Work in a relatively clean area whenever possible.

  • Complete the work in the shortest possible time.

Any major injection pump or nozzle repairs should be done by a quality diesel injection service shop. The necessary service equipment and facilities are not found in most engine rebuild shops because of the large investment required.

The following procedures can be accomplished under field conditions:

  • Bleeding air from the fuel system.

  • Fuel tank and filter system maintenance.

  • Priming pump (hand) replacement or repair.

  • Fuel transfer pump replacement or repair.

  • Injection line replacement.

  • Engine speed adjustments.

  • Injection pump timing.

  • Nozzle spray pattern testing and adjustment.

  • Injection nozzle testing, adjustment, and minor repair.

  • Trochoid feed pump replacement.

Parent topic: Engine Fuel System