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The pic below is supposed to be a Timing Chain Tensioner from a 1968 220D.
The Red Arrow points to the Oil inlet hole.
The Oil for it comes from the Oil Gallery just like it does for the Main Bearings.
While Mercedes does not recommend turning any of the Engines opposite the direction of rotation on Engines that have the type of Tensioner you have it is calimed it is possible for it to jump a tooth if turned backwards.
Apparently the Oil Pressure is mainly responsiable for keeping tension on the Timing Chain Rail.
The Newer Models like mine have a slightly different set up that does not allow the Plunger to be pushed Backwards.
I do not know on your particular Engine but on the later model Engines the Engine Number is about in the Middle of the Engine Block on the Drivers Side (US models). It is right where the Head and the Block come together; not easy to see.
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84 300D, 82 Volvo 244Gl Diesel
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