The heavy failures where occurring some years back. They were fairly frequent. It would take pages to describe just what may be going on with low fuel pressure.


A not too large variation over time is what is important. I got past the lubrication issue fairly easy. The n/a five cylinder is almost identical other than having an additional cylinder and another rod bearing. The front rod bearing is fed from the back of the crank. If it was lubrication we should have seen more failures on the five cylinder than the four. Where there where almost none in comparison.


I also assumed more five cylinders where sold than four. Also that basic four cylinder engine was in production long enough that Mercedes probably would have dealt with a poor lubrication issue. This also was not ever a real issue with any of their engine designs.


I have to be careful that I do not touch on things that some member. Might go off on a tangent that is damaging. So I just left it at the car is more reliable as well as runs at least a little better with some semblance of reasonable fuel pressure.


It is in general cheap and easy to keep the fuel supply system in good condition. Plus much easier to troubleshoot if you understand it. Because of the use of milli volts I can document the changes with fuel pressure. At least enough to tell if they are damaging or not.


. For my age I am buried in far too many non car projects. I would like some time to do testing of what are only possible suspicions.


I have two 240ds for testing. A 1979 with a recient Mercedes dealer later installed rebuilt engine at the time of acquisition. Plus a 1983 with about 200k on the original engine I suspect. Neither have accumulated many miles since purchase.


Things that interest me. We had an older member some years back running his 240d on thirty pounds fuel pressure. It was gauged. I really wanted to get into this area of how the power balance is doing with testing. He dropped off the site too early after his first impressions where posted. There may or may not be any issue with heavily increased fuel supply pressures. Testing though is the only way to be pretty certain. I purchased the five digital meters to make a tester. In the last year. To have a look if the time can be found.


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