I can't remembe reading why the Chain failed to know if it was connected with the Oil Pump or not. Or if it was something that could have damaged the Oil Pump.

If you took it apart I don't know if there is any Gasket inside or if that is available if there is one.

Also you would be limited to a visual inspection because I don't believe there wear limit specs in the Manual. But, if the Parts don't show a lot of wear there is no reason why it should not work.

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84 300D, 82 Volvo 244Gl Diesel