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Two versions of externally controlled com-
pressors are used in the Audi A4:
– the 6-piston compressor, which you have
already studied in detail in SSP 240,
– the 7-piston compressor, which differs in
the number of pistons and the resulting
increased displacement.
Depending on the country-specific vehicle
version, the 7-piston compressor with its
higher total output is used (e.g. in hot coun-
tries).
Based on the engine version installed, a dis-
tinction is made between the following com-
pressor
types:
– 6 and 7 pistons for compressor fitted on
right side of engine,
– 6 and 7 pistons for compressor fitted on
left side of engine,
– 6 pistons for 6-cylinder TDI Diesel mechani-
cal units.
Vehicles equipped with a 7-piston
compressor, are fitted with a radiator fan
which has a higher output.
Distinguishing features to identify the com-
pressor fitted are:
– Lettering on the compressor identification
plate is 6SEU for the 6-cylinder or 7SEU for
the 7-cylinder compressor.
– the greater outer diameter of the
7-cylinder compressor (approx. 122 mm)
compared to the smaller outer diameter of
the 6-cylinder compressor
(approx. 113 mm)
7-piston compressor
SSP254_033
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