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Second test - vacuum pump plugged
I decided to repeat the test on my W123 car (1985 300D-T w/ trap cat) after disconnecting the vacuum pump and plugging the line. The purpose was to see if there was a leak in the vacuum system that was showing up as increased blowby. The short answer is: NO CHANGE.
The first two pictures show vacuum levels in the system before disconnecting anything. Next is a picture of the main vacuum line disconnected and a small rubber stopper inserted to plug the line. The final picture shows the garbage bag, tightly blown up in 120 seconds.
Clearly, the vacuum system in my car doesn't have anything to do with the amount of blowby. (YMMV) I also did a teakettle test and was surprised at the amount of jiggle and oil that sputtered out from under it (the plastic cap may be to blame). The bag-test blowby is twice that of my 124 car , even though the latter is the one with the oil-burning problem. Most interesting!
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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