20V Motronic ECU System

1991 200TQ and 1992-95 S4/S6 with 20V Engine:

Coolant pipe O-Rings, seal and Turbo coolant hose

If you have the intake manifold removed to replace the distributor or rotor, I also recommend that you remove the cast aluminum coolant distribution pipe (water manifold) that bolts to the cylinder head and replace the 3 O-Rings (Audi # N 028 203 4) size is 15x2.5mm and the triangular shaped rubber gasket (Audi # 027 121 139A).

The O-Rings appear to be made from silicone rubber to handle the high temperatures. We stock these seals and O rings.

Replace the short piece of turbo coolant hose only with the Genuine High Temp Hose, available from our parts catalog

You may need to move the power steering pump out of the way or remove it completely for access to this hose.

This hose is spec'd to be a 10x3.5 mm size, on the 1991 200TQ 20V spec's the hose to be 130mm long, (5.1 inches), the 1992-95 shows the hose to be 160mm long (6.3 inches)

I don't recommend using fuel line to replace this coolant hose as it won't handle the high temperatures for very long and will get hard as a rock and leak..



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References: [1] Audi of America, Technical service training publication:
"The New 20V Turbo Engine for the Audi 200 Quattro-publication All rights reserved.

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