Abstract: The invention relates to a sealing arrangement for an internal combustion engine (11) which includes a reciprocating member (30) which is arranged for reciprocal motion in a complementary cylinder (24, 26) having parallel and opposed side walls (18, 20) and an arcuate end wall (14, 16) extending transversely between them, the reciprocating member (30) having opposite side edges, with an end edge which extends transversely between them. The sealing arrangement includes elongated side and end sealing elements (102, 202) extending respectively along each of the side and end edges of the reciprocating member (30) and respective urging means (106) in engagement with the sealing elements (102, 202) to urge the scaling elements (102, 202) away from the respective reciprocating member edges and into contact with the respective cylinder walls (14, 16, 18, 20), to bridge the clearance gaps and seal off a combustion chamber (34.1, 34.2, 36.1, 36.