Fuel Injectors, Cleaning

Special tools and workshop equipment required

Cleaning

Follow the guidelines for clean working conditions. Refer to GUIDELINES FOR CLEAN WORKING CONDITIONS .

-- Connect the drain valve -arrow- to the Ultrasonic Cleaning Unit: VAS6418 on the right side of the housing.

Fig 1: Drain Valve

Courtesy of AUDI OF AMERICA, LLC

-- Fill the ultrasonic sensor.

Cleaning Fluid Mixture Ratio:

2100 ml settled tap water and 20 ml Cleaning Fluid: VAS6418/2 or commercially available neutral cleaner.

-- Remove the fuel injectors. Refer to FUEL INJECTORS, REMOVING AND INSTALLING .

-- Place the Mounting Plate for Injection Modules VAS6418/1: VAS6418/1 on the cleaning unit.

Fig 2: Identifying Ultrasonic Cleaning

Courtesy of AUDI OF AMERICA, LLC

Pay attention to the safety precautions in the Owner's Manual before operating the Ultrasonic Cleaning Unit: VAS6418 .
The ideal fluid level is reached when the cleaning fluid is approximately 1 to 4 mm above the bottom of the mounting plate. A fluid level which is too low can damage the Ultrasonic Cleaning Unit: VAS6418 .

-- Insert the FSI fuel injectors all the way into the guides on the Mounting Plate for Injection Modules VAS6418/1: VAS6418/1 .

-- Switch on the cleaning unit by pressing the on/off button -C-.

Fig 3: Identifying Ultrasonic Cleaning Unit Controls

Courtesy of AUDI OF AMERICA, LLC

-- Set the cleaning time on the knob -A- to 30 minutes.

-- Set the temperature on the knob -B- to 50 °C (122 °F).

-- Press the → button -D- to start cleaning.

The temperature controlled cleaning is now switched on. During the heating-up phase the ultrasonic switches on the cleaning fluid circulation in intervals. After reaching the pre-selected temperature the ultrasonic is switched on for a long period.
The cleaning must take at least 30 minutes and first begins once a temperature of at least 50 °C (122 °F) is reached.

-- Install the fuel injectors with a new combustion chamber seal. Refer to FUEL INJECTORS, REMOVING AND INSTALLING .