W123, USED Diesel Engine

Kent, Hope all is well. Ran the purge and installed the new Monark injector tips and boy what an improvement! As is always the case, fix one thing and find another... Got your Diesel performance book (with the tips order), went thru the various tests and find a moderately dancing oil cap. Being a noob now hindsight is 20/20 but my question is this - assuming I need to do an overhaul, what is the typical needed parts list, cost for same and "ballpark" labor charge for doing an overhaul. Before I had it shipped from CA I had a Mercedes mechanic replace the timing chain, now the new injector tips and really the car is running fine. So, do I tolerate it and just live with it and wait for the inevitable or be proactive? What actions can I do to reduce blow-by in the interim?

In one of my 82 300DTs the heater isn't working. I have replaced the brushes on the blower, the climate control unit, the monovalve, thermostat, radiator, and water pump all to no avail. Where should I turn next?

hey guys received my manuals the other day. well written and helpful. i guess i got lucky with my 240d buying it with limited MB knowledge. i do have a question as to what types of oil was mercedes requireing for oil changed in the early 1980s. my owners manual states that the car had regular maintanece (it shows 73k on the odometer but is has quit working) the oil changes were performed with castrol 20w 50 not exactly a diesel motor oil. these were done at authorized service ceneters . was this the best choice for oil back then? could this be the reason i have a lot of crank case pressure on an engine with less than 100k?

Hi--- I have an '81 240D fitted with the 2-tank Greasecar system. Don't do too much of my own work, but I'm using the 75 MPH Guide to keep Anna happy and healthy. So far, so good... but, I've gone through 3 water pumps in less than 10,000 miles. The 1st was the original, so I new that would happen. And it did at exactly 120,000. Had it replaced with a Bosch, which promptly failed. Had it replaced again with a German pump, the name eludes me. Well, this pump also failed and I'm having it replaced with a Mercedes pump. Fortunately, this is all warranty work.