I.c. engine cooling fan drive train

An engine assembly comprises an internal combustion engine 2, a fan 3 for pulling air through a heat exchanging radiator, and a fan drive train arrangement 5-10 for effecting rotation of the fan 3 indirectly from the crankshaft of the engine. Intermediate in the fan drive train 5-10 is a first pulley 7 which is coaxial with the fan 3 and which is rotatably mounted on a support 11, 12, 14, 16 fixed relative to the engine 2. The support may include a bridging plate 14 which spans across one end of the crankshaft. The fan drive train may include pulleys 5, 6, 7, drive belts S, 9 and a viscous coupling 10. The drive train arrangement 5-10 is adapted to rotate the first pulley 7 at higher rotational speed than the crankshaft and therefore provide for increased cooling duty.