Nozzles — removal, inspection and installation

Nozzle

Check on the engine

1. Make sure that the engine is working properly and the compression level is the same in all cylinders.

2. Start the engine and warm it up to operating temperature.

3. Loosen the fuel line union nut on the injector to be checked. Note if the engine speed has changed. Carry out the same test at fast idle.

4. With a working nozzle, there will be a clear decrease in engine speed, accompanied by its uneven operation. If the injector being checked is faulty, the change in engine speed will be insignificant and, if present earlier, an extraneous knock will disappear.

Withdrawal

1. Remove air filter.

2. Clean the high pressure fuel lines, unscrew the union nuts on the fuel pump and protect them from contamination.

3. Unscrew the fuel lines from the injectors and close them.

4. Unscrew the nozzles with a socket wrench and remove the copper sealing rings and heat-insulating washers from the holes.

5. Clamp the atomizer body in a vice with soft jaws, disassemble the nozzle, and using a wooden tool clean all the nozzle parts.


6. The nozzle needle under its own weight must slide tightly into the nozzle seat.

Installation

1. Install new heat-insulating washers in the cylinder head with the convex upwards.

2. Install copper o-rings.