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The TU family of small inline-four piston engines by PSA Peugeot Citroën were introduced in 1986 and used in the Peugeot and Citroën range of cars. It was first installed in the Citroën AX in October 1986, replacing the X family, although it shared many components with its predecessor. The TU was available in either petrol or a naturally aspirated diesel variant, the latter called TUD.
The TU engine was distantly related to the older X-Type engine – sharing a similar overhead camshaft architecture, but the key differences are the belt driven camshaft , and that the TU is mounted in a conventional upright position with a separate, end-on mounted transmission and unequal length drive shafts. The X engine, by comparison, had an integral transmission mounted on the side of the crankcase , sharing a common oil supply and was mounted almost lying flat on its side within the car....