I would go by the 603 instructions, but:

in SUB-ZERO temps be CERTAIN before you crank that you have heard the glow relay come on , and come off, then kill the key, and check it again, and the INSTANT after the relay clicks off the second time you crank the key, and hold it until it fires, and be ready to give 1/4 throttle. it's true, if the motor does not catch and run after you let off the key, it's SUPER DIFFICULT to get the motor to start.
this is likely not the manual prescribed procedure, but it's the one best to use in cold weather on an older diesel motor. good glow plugs are very important here.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!