Here is a pics of the timing locking pin; see the thread.

http://www.peachparts.com/shopforum/diesel-discussion/369233-ip-install-locking-tool-weird-teeth-off-mark.html

Also you should have a sticker under the hood that tells you what the timing is.

Also the Timing Locking Pin does not come with instructions.

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84 300D, 82 Volvo 244Gl Diesel