Plug in the block heater for about thirty minutes prior to attempting to start.

I agree with loosening the hard fuel lines at the injectors, and then crank until you get fuel and tighten them back up. Usually the first injector to get fuel out the line is the one at the rear-most of the engine (#5 in your case).

If it still doesn't want to start, next step is a valve adjustment.

If the car is still stubborn, AND you get some reading of oil pressure on the gauge while cranking, then I recommend pull-starting the car with another vehicle. The procedure is in the owner's manual for how to do this properly.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC