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#1
10-24-2012, 06:58 PM
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Vibration: Yet Another Question
1985 300 TDT 312K
I have a vibration somewhere in my driveline. It is not the engine as that is smooth throughout the rpm range while in Park. I can feel this vibration in the chassis while increasing throttle e.g. Cruising at 40 mph and press on the throttle gently and the car will vibrate slightly until you back off slightly and let the car just cruise along. Anytime you give it throttle while cruising this occurs. It can be light throttle or heavy throttle. Back off and cruise and the vibration is gone. Speed doesnt matter....happens at 40 mph or 80 mph. Work performed: New Motor mounts, engine shocks and bushing kits, valve adjustment, flex discs, center support/bearing/boot. Trans mount new 30,000 miles ago. All fluids and filters changed, new rear axles. All MB factory parts used. When the driveshaft was off, we noticed that the universal joint had the "notch" on both axis that happens in the position where the universal usually runs{they dont move much under normal circumstances}. The only things left I can think of are to have a new universal put on the driveshaft/balancing and/or new trans mount. Any other thoughts or suggestions?? I think I've read 1,000 posts on driveline vibrations!  Thanks John
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1985 300TDT 2013 E350 Bluetec 
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#2
10-24-2012, 07:07 PM
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Check if the wheels are not damaged. Properly balanced.
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#3
10-24-2012, 07:07 PM
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__________________
 Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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#4
10-24-2012, 07:29 PM
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Quote:
The vibration on my car happens only when giving throttle to the car? Does this make sense or am I missing something you are saying? John
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1985 300TDT 2013 E350 Bluetec
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#5
10-24-2012, 07:34 PM
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Quote:
I thought of this bushing as mine is original to the car. It would be the easiest place to start. What do you think of the "notchy" feel of the universal at its center point? Is this an issue? John
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1985 300TDT 2013 E350 Bluetec
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#6
10-24-2012, 07:36 PM
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Quote:
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#7
10-24-2012, 08:12 PM
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A careful inspection of the flex disks might be in the cards. Torque and loading them might put the driveshaft a little off centre if they have deteriorated to any extent.
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#8
10-24-2012, 08:13 PM
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Quote:
Thanks John
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1985 300TDT 2013 E350 Bluetec
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#9
10-24-2012, 08:16 PM
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Quote:
Are there centering bushings on both ends of the driveshaft? Are they pressed on or just slide into place? Any special tools or suggestions on ease of replacement? Thanks John
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1985 300TDT 2013 E350 Bluetec
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#10
10-24-2012, 08:52 PM
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Just did the same work this weekend, same slight vibration! Sounds like a thrumming boat engine at speed (65ish). I carefully marked all the drive shaft parts with painted lines and lined them all back up. Only thing I can come up with is a "possible" faulty center bearing. The vibration is not extreme and actually very slight, but noticeable to me, not to anyone else in the car!
All discs and other rubber parts and bearing bracket were torqued to spec. ??? Only difference between us is that I was chasing a body/engine vibration and just added this one since the body/engine vibration is still there.
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1980 300TD, SOLD 1984 300TD, 275K  1999 C230 K Black & Tan 2013 C250 Black 1974 CJ5 Red You might faint from the fight, but you're gonna find it. Every challenge could have paradise behind it. -John Popper-
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#11
10-24-2012, 09:08 PM
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Quote:
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1985 300TDT 2013 E350 Bluetec
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#12
10-24-2012, 09:51 PM
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Quote:
__________________
Did you just pass my 740 at 200 kmh in a 300SD?????1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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#13
10-25-2012, 06:55 AM
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Quote:
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1985 300TDT 2013 E350 Bluetec
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#14
10-25-2012, 07:01 AM
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this is also the symptoms you would get if the ring and pinion are out of spec...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#15
10-25-2012, 08:08 AM
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Seems to obvious but did you check your lug nuts?
(Don't ask why I ask) 
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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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