Annoying Engine Vibration - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 03-25-2015, 07:04 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jul 2007
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Annoying Engine Vibration

I recently bought a 71 220D. The engine has a terrible vibration at idle. Even worse when in gear (it's an automatic). A first I thought it might have been loose exhaust, but that is not the case. I actually removed the whole exhaust to see of it changed and it is still there. It vibrates the whole car, dashboard, steering wheel, even noise comes from the trunk area. I looked a motor mounts and they seem good and flexible. There is no part of the engine touching the chassis anywhere. Just off idle it gets accectable, from maybe 1100 rpm and up. It almost seems like something in the engine is out of balance. It is not like a cylinder miss, just a bad vibration. Someone suggested a bad torque converter, but the fluid is very clean, so I have my doubts about that. If it would help, I could take a video of it and post it here. The vibration is so bad that you can see it in the way heater hoses and AC hoses and even the air filter shakes. Has anyone had this issue before? I hope this isn't "normal". I understand this is a diesel and it will vibrate more than a gas engine, but I don't think it should vibrate this bad.
Stumann is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 03-25-2015, 08:05 PM
Premium Member
 
Date registered: Nov 2012
Posts: 1,241
Mentioned: 0 Post(s)
Quoted: 59 Post(s)
Premium Member
remove the a/c belt to see . also with engine running at idle , with a floor jack , at the oil pan , lift the engine a little to see if this vibration goes away .also at the rear of transmission . put something bettw oil pan and jack saddle to soften the contact point .
agillot is offline  
post #3 of 8 (permalink) Old 03-27-2015, 12:50 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jul 2007
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
There is no a/c belt on it. I'm going to attempt to post a video of the engine idling. If someone else has a similar car and thinks this is a normal amount of vibration, I'm no going to worry about it, I just don't think this is normal.

Apparently I can't upload a video, so here's a link to the video on Photobucket. I'd like to get some opinions. The a.c compressor looks like it's loose, but it's not. Everything vibrates that much.

http://vid304.photobucket.com/albums...n666/00018.mp4
Stumann is offline  
post #4 of 8 (permalink) Old 03-27-2015, 05:58 PM
BenzWorld Elite
 
rumb's Avatar
 
Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
Location: Colorado
Posts: 2,348
Mentioned: 5 Post(s)
Quoted: 425 Post(s)
Garage
try what agilott said to see if you have bad mounts
rumb is offline  
post #5 of 8 (permalink) Old 03-28-2015, 04:43 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jul 2007
Posts: 6
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
I tried the floor jack thing like agillot recommended, but it almost seems worse, definitely not better. I guess the question I'm trying to ask is, do these engines vibrate that much normally? The engine runs fairly smooth off idle. I just can't imagine millions of people buying these cars if they shook this much when they were new.
Stumann is offline  
post #6 of 8 (permalink) Old 03-29-2015, 11:51 AM
BenzWorld Member
 
Luna Gaudi's 72 250's Avatar
 
Date registered: Sep 2012
Vehicle: 1972 Mercedes Benz 250
Location: Santa Fe, NM U.S.A.
Posts: 389
Mentioned: 0 Post(s)
Quoted: 17 Post(s)
I am not a diesel guy (so take what I say lightly) I will just mention the basics. Have you checked the rpm's at idle with a combination timing light/tachometer to see what they are at? To me the idle seems a bit low. Is the timing set correctly? My gasoline engine shakes like that at 150 rpm's below the factory setup. Check the glowplugs and carbon buildup.

Here is a link to another similar engine,


and another


let us know what you find and good luck.

Last edited by Luna Gaudi's 72 250; 03-29-2015 at 01:13 PM.
Luna Gaudi's 72 250 is offline  
post #7 of 8 (permalink) Old 03-29-2015, 01:00 PM
BenzWorld Elite
 
rumb's Avatar
 
Date registered: Oct 2012
Vehicle: 1968 250S, 1991 300se, 1998 SL500, 2x 1977 450SEL 6.9. Past MB's; 300SD, 300E, 300TE, 190E, ML420
Location: Colorado
Posts: 2,348
Mentioned: 5 Post(s)
Quoted: 425 Post(s)
Garage
Always good to start with the basics. adjust valves, check idle speed as suggested.

look at your front crank pulley/damper see it it is ok.

if not then start suspecting internal parts.


post another video going from idle to higher engine speeds.
rumb is offline  
post #8 of 8 (permalink) Old 03-30-2015, 07:25 PM
BenzWorld Newbie
 
Date registered: Mar 2015
Posts: 2
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Vibertion Harmonic balancer

My bet would be on the harmonic balancer. In other cars they have gone bad assume the MErcedes is no different. The rubber isolator gets worn or brittle and will cause vibration. I also know that on the 250S the crank is balanced with the harmonic balancer so if it was changed without being re-balanced it will never be smooth. Only way to repair is to take the crank out and have it balanced with the harmonic balancer.

That's my guess.
merbenztem is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome