A combustion engine comprising a rotational output shaft and a decoupler assembly , wherein the decoupler assembly comprises a pulley that is rotationally attached to an exterior part of the decoupler assembly , wherein an interior part of the decoupler assembly is coupled to the rotational output shaft of the combustion engine for rotation therewith, and wherein the decoupler assembly is arranged to transmit torque from the output shaft to the pulley and via a belt further to at least one input member , the decoupler assembly comprising a torque equaliser and a one-way clutch bearing , the torque equaliser comprises an inner member having a rotational axis (A), an outer member disposed concentrically and surrounding the inner member , and two arcuate spring elements arranged between the inner member and outer member and configured to transmit torque between the inner member and outer member , wherein the one-way clutch bearing is located in the same radial plane as torque equaliser , wherein the one-way clutch bearing comprises an outer race , an inner race , and a plurality of individual wedging locking elements that are disposed between the inner and outer race , and wherein the torque equaliser comprises a spring sealing arrangement for sealingly enveloping the two arcuate spring elements , characterised in that the inner member is rotationally displaceable relative to the outer member at least 30 degrees, specifically at least 45 degrees, and more specifically at least 60 degrees upon compression of the two arcuate spring elements , the one-way clutch bearing is rotationally connected to the outer member of the torque equaliser , and the spring sealing arrangement comprises a pair of annular sealing covers arranged on opposite axial sides of the two arcuate spring elements , wherein at least one of the annular sealing covers is integrally formed with the inner or outer member , wherein at least one of the inner and outer members is split into a first and a second part that are disposed side by side along the rotational axis, and an annular sealing cover is integrally formed with each of the first and second parts and the annular sealing covers jointly form a generally toric interior surface that is adapted to partly enclose the two arcuate spring elements . the inner member is rotationally displaceable relative to the outer member at least 30 degrees, specifically at least 45 degrees, and more specifically at least 60 degrees upon compression of the two arcuate spring elements , the one-way clutch bearing is rotationally connected to the outer member of the torque equaliser , and the spring sealing arrangement comprises a pair of annular sealing covers arranged on opposite axial sides of the two arcuate spring elements , wherein at least one of the annular sealing covers is integrally formed with the inner or outer member , wherein at least one of the inner and outer members is split into a first and a second part that are disposed side by side along the rotational axis, and an annular sealing cover is integrally formed with each of the first and second parts and the annular sealing covers jointly form a generally toric interior surface that is adapted to partly enclose the two arcuate spring elements . <EOS>