Peugeot 2.0, 2.1, 2.3 and 2.5 litre Diesel Engines (74 - 90) up to H
2.0 (engine code XD88)
2.2 (engine code XD90)
2.3 (engine code XD2 / XD2S)
2.5 (engine code XD3 / XD3T)
Should be used in conjunction with the appropriately numbered Haynes Manual:
Peugeot 505 (Manual No. 0762)
Also covers most features of engine fitted to Peugeot 504 and 604