The invention relates to a hydraulic tensioning device for tensioning a flexible drive means of a camshaft of an internal combustion engine, the tensioning device arranged on an end face of an engine housing consisting of a cylinder head housing and a crankcase, which can be displaced in a cylinder bore of a hydraulic housing and acted upon by the lubricating oil pressure from the lubricating oil circuit of the internal combustion engine Compression ram and a tensioning rail and wherein the hydraulic housing also covers an outlet opening of an oil channel connected to the lubricating oil circuit. In order to design and arrange a hydraulic tensioning device for tensioning a flexible drive means in such a way that its oil supply is guaranteed directly by an oil channel provided in the engine housing, the invention proposes that the oil channel extend from a main oil channel in the crankcase in the direction of a longitudinal axis of the internal combustion engine to supply lubricating oil at least the main crankshaft bearing is formed. IMAGE
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