You can take out the Delivery Valve but don't remove the 2 each `13mm nuts on each side of the delivery valve to pull out the elements. Turning the element changes the calibrated fuel setting and changing the number of shims under it changes the timing.

Try disconnecting the vacuum line from the Shutoff on the Fuel Injection Pump. The main color or the line is brown or brown with a blue strip; cant remember exactly which one.

When you us the manual shutoff it compresses a spring loaded plunger which telescopes up inside of they. They have been know to get rusty inside and the plunger stick up wards. Make sure the plunger comes all the way out.

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84 300D, 82 Volvo 244Gl Diesel