Of course ream out or other wise clean the Glow Plug Holes after the Plugs are out.

When the Glow Plugs go back in the head use a Neverseeze type compound on the threads or Beru Glow Plug Grease
http://www.peachparts.com/shopforum/showthread.php?t=221211

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84 300D, 82 Volvo 244Gl Diesel