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#1
06-04-2019, 12:16 AM
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OM602 Vacuum Pump Questions
Hi All,
I'm tinkering with my 91 300D and I had some vacuum leak issues. I've buttoned up the leaks I had but I was checking the pump per the factory method as shown: I get vacuum fine at the booster. If I put my finger over the line at the booster (or connect it) I do get 15-16" at the secondary connection at the pump. Going by the test, my pump is bad but it doesn't appear to be from a logical stand point--at least mine lol. Does the vacuum pump have two separate "stages" or "chambers" that should function independently and by failing this test, the separation is compromised? What do you guys think? (07.1-1843) 
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k 
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#2
06-04-2019, 11:08 AM
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The vacuum pump has a couple of disc style check valves in it that can fail or crack and allow leaks. A good pump will pull 21-22" of vacuum easily.
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Current stable: 1995 E320 149K (Nancy) 1983 500SL 120K (SLoL) Black Sheep: 1985 524TD 167K (TotalDumpster™) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!)
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Linear Mode
