3 Remove the nozzle nut NOTE: Use a special box spanner for the hole type (the thickness of the two nozzle nuts is 15mm(0.5906in.)). (4) Remove the inner parts NOTE: Be careful not to loosen the spring seat, adjusting shims or other small parts. 5.4. Fuel injection nozzle inspection 5.4.1. Washing 1 Make sure to use new diesel oil to wash the fuel injection nozzle parts. 2 Wash the nozzle in clean diesel 0il with the nozzle cleaning kit. (3) Clean off the carbon on the outside of the nozzle body with a brass brush. (4) Clean the nozzle seat with cleaning spray. (5)Clean off the carbon on the tip of nozzle with a piece of wood. 51