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#1
08-17-2005, 01:19 PM
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strange + scary RPM-related vibration
so my '80 300TD doesn't seem to have any transmission problems, and the motor-mounts have been replaced pretty recently and appear to be in great shape.
BUT when driving there is this pretty serious SHUDDER / vibration that varies with the RPM's / speed. a little noticible around town and VERY noticable on the freeway. at first i thought it was a tire/wheel/axle or something, but the shudder stops when you take your foot off the gas, and gets faster as you accelerate. you can FEEL it, and the sound is like: wooomb, woomb, woomb. can't really tell where it's coming from, though. any ideas what it could be? those little motor shocks? or a bent or unbalanced shaft or something?
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-lee '83 300CDT (286k) former proud owner of: '85 mercedes euro 300TD '80 mercedes 300TD '77 mercedes 280e '80 mercedes euro 250 '82 mercedes euro 250 
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#2
08-17-2005, 01:31 PM
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Check the center bearing on the driveshaft.
Had similar vibration. Heres the link: Vibration After Changing Motor & Trans mounts
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#3
08-17-2005, 01:49 PM
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Flex discs????
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
08-17-2005, 06:46 PM
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sometimes
a wagon will resonate with unusual vibrations that you would never hear in a sedan. it might not be much of a problem, depending on how loud it is. you dont have a window open do you?
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
08-17-2005, 08:31 PM
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There was a posting last spring about a similar problem in a wagon. It was a rear wheel bearing.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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