Hi all ,
again I just have a question regarding my old 67 MBZ 200D diesel. Things I've installed recently: new timing chain , camshaft, new fast glow plugs , new starter wires , new battery , new fuel hoses , e.t.c. Cold start of my 200D became not a problem ... until now ... winter .. well, temperature dropped down and I started to experience the same old problem. I've gotten myself a harbor freight compression tester. did compression test on warm engine yesterday:
300 , 290 , 310 , 295 psi. 1 to 4 cylinder respectively.
so my question is:
Are these compression numbers low enough to make winter cold start impossible ?
maybe somebody knows what are they supposed to be for OM621 ?

Currently I see that if temperature drops below 32-30 F I just can't start my old MB without plug it into power outlet first for 2-3 hours, then she starts right up so far...
and if the compression is not so bad then maybe someone could direct me where else could I dig to get the reliable winter cold start on these vintage engines ... lets say, compression rings replacement maybe ? so I wanted to listen some advises before I start doing something drastic.
Thanks a lot to the members of this forum for their replies .