No where have the basics been mentoned :

Valve adjust then a Diesel Purge followed by new filters then just for shytes & grins try following the Mercedes cold weather starting drill : throttle to the floor & HOLD IT THERE .

Cycle the glow plugs twice before engauging the starter , do not let off the starter until the engine begins to run on all cylinders , then release the key and ease up on the throttle to keep it runnng , no need to rev it to the moon

This worked to instantly light off the totally worn out engine in my '78 300CD even in 0* F temps . it also works for all my Canadian buddies, the guys in Michigan and Philly , New York , Bostom , Maine and New Hampshire etc. when it's 30* F out so give it a try .

In 50* F weather , the engine isn't supposed to stay running on a cold start all by itself unless the engine is new . give it a little throttle , NEVER pump it

Never forget that this is a 1940's technology machine ,YOU the Operator , must bend to it's needs , not the other way 'round .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better