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In theory locking the IP with the about $36 Tool is supposed to keep you from having to retime the Fuel Injection Pump.
If you did need to retime the Fuel Injection Pump it is supposed to be done with the A&B Light or the RIV method. There is no Drip Timing spec for your Fuel Injection Pump.
Likely what is confusing is the Timing and also the installation of the Timing Locking Pin is done at about 15 degrees after top dead center of the compression stroke. (There is a sticker on your Car that has the specs for your specific Enging.)
Below is a pic of the Timing Locking Pin.
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84 300D, 82 Volvo 244Gl Diesel
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