A drilling unit, comprising a chassis (3, 4) and a drilling machine (1, 2) arranged in front of the same, the chassis encasing an engine-house (8), in which an engine (9) is arranged as well as at least one cooler (14) and at least one fan (15), the drilling unit comprising at least one partition wall (17) that divides the engine house (8) into a first part (18), which accommodates the engine (9), and a second part, which accommodates said cooler (14) and fan (15), and that the partition wall (17) extends transverse to the longitudinal direction of the chassis and divides the engine house (8) into a front part (18) and a rear part (19). The first part (18) of the engine house (8) forms the front part and the second part (19) of the engine house (8) forms the rear part.