@fouadabid
CDI stands for Common-Rail Direct Injection... i think the term CDI is used by Mercedes Motors, Toyota use D4D for common rail engines.
CDI engines are much more efficient than the normal diesel engines + less noise and no heating required before starting... you can search wikipedia.com for further details.
if you are looking for an engine, visit SHOBA Bazar (Peshawar). hopefully you'll get one.