Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-19-2005, 09:47 PM
Registered User
 
Join Date: Mar 2005
Posts: 155
W123 Engine Mount

I told the shop to replace my 2 engine mount and a tranny mount on my 85 300D. When I took the car in, the car was shaking like crazy, you can see the hood shaking and in additional to the diesel sound, you can hear the kong kong kong kong sound. Now, after I took it out, the car was like a gasoline car. It wasn't shaking, very smooth, and you can only hear the diesel sound (klaata klaata klaata). After driving around 10 - 15 miles, when I came to a stop light, I felt the car shaking again. It wasn't as crazy as before, where you can see the whole hood vibrating. Its just a little shaking. I opened my hood, the engine was shaking like crazy, but not the car. I looked at the engine mount, it seems like a boat, moving left and right.

What might be wrong? They didn't screw it tight enough? Or something else?

Reply With Quote
  #2  
Old 07-20-2005, 12:48 AM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,359
it sounds

as if they left some bolts loose and they fell out.
__________________
[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.
Reply With Quote
  #3  
Old 07-20-2005, 07:05 AM
Registered User
 
Join Date: Jul 2004
Location: Norwich, VT USA
Posts: 905
Check yer oil cooler hoses.....In my car the AC belt started to saw through the oil cooler hose because of the additional freedom that a buggered mount had afforded the engine to waltz around the engine bay.
__________________
Rob M
Norwich, VT USA
1980 240D Euro delivery 4 speed manual silver/blue
~160K miles
Reply With Quote
  #4  
Old 07-20-2005, 07:38 AM
Registered User
 
Join Date: May 2004
Posts: 69
maybe your idle speed is too low. mine would shake noticeably more until i upped the idle speed just the slightest bit.
Reply With Quote
  #5  
Old 07-20-2005, 09:05 AM
Registered User
 
Join Date: Jul 2004
Location: Illinois
Posts: 222
I tend to agree with our resident architect with one possible twist. Check the mount shocks to see if they are attached properly. If they are, then remove them to determine if they still have resistance. The shocks working properly is just as important as the mounts being in good condition.

Good Luck,
Tom
__________________
1993 300TE
1984 300D
1984 300SD
1976 BMW R90S
Reply With Quote
  #6  
Old 07-20-2005, 09:08 AM
Registered User
 
Join Date: Mar 2005
Posts: 155
Is it difficult to remove the engine shock without a lift?

I'm just curious, how does the engine oil line look like and what does it do?
Reply With Quote
  #7  
Old 07-20-2005, 10:18 AM
Registered User
 
Join Date: Mar 2005
Posts: 155
New update:

I started the car up this morning, it was as smooth as if I just took the car out from the shop. Didn't go far though. Maybe if I go a few miles, the engine warms up and it'll shake again? Perhaps this happens, what might be the reason?
Reply With Quote
  #8  
Old 07-20-2005, 10:34 AM
Registered User
 
Join Date: Jul 2004
Location: Illinois
Posts: 222
Schmohey,

I retract what I said about the mount shocks. If it is smooth-running this morning there must be something else going on. Once the shocks have gone bad, they are bad forever. Same with the mounts. Maybe somebody else can chime in here about rack dampener pins or ?

The oil cooler line runs right beneath the A/C compressor. The oil from the engine is routed to the oil cooler by the radiator. If the motor mounts collapse enough, the belt from the A/C will rub throught the oil cooler line and cause catastrophic oil loss.

Tom
__________________
1993 300TE
1984 300D
1984 300SD
1976 BMW R90S
Reply With Quote
  #9  
Old 07-20-2005, 12:42 PM
Registered User
 
Join Date: Sep 2004
Posts: 8,774
The engine mounts do not stop an engine from shaking. They just prevent some of the vibration from being transmitted to the frame.
To stop the engine from shaking at idle, adjust (or replace) the governor idle pin (aka rack damper pin) on the rear of the injection pump. You might be amazed at the improvement.
Reply With Quote
  #10  
Old 07-20-2005, 10:15 PM
Registered User
 
Join Date: Mar 2005
Posts: 155
I've tested it again today, it seems like it only happens when the car is warm/hot. Do you happened to have a picture of the pin?

Second question is, today my coolant expansion tank was overflowing antifreeze. I didn't fill in any coolant. This never happened before. Do you suspect the oil cooler line, or was it just too hot?
Reply With Quote
  #11  
Old 07-20-2005, 10:41 PM
JimmyL's Avatar
Rogue T Intolerant!!!
 
Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,673
Quote:
Originally Posted by Schmohey
Do you happened to have a picture of the pin?
Schmoster, it is time to embrace the search function, as there have been many quality posts about the rack dampner pin. Search "dampner" and "damper"

Quote:
Originally Posted by Schmohey
Second question is, today my coolant expansion tank was overflowing antifreeze. I didn't fill in any coolant. This never happened before. Do you suspect the oil cooler line, or was it just too hot?
The best way to judge if it was too hot would have been to look at the temp guage. Did you notice what it was reading at this time?
__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
Reply With Quote
  #12  
Old 07-20-2005, 10:45 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 37,359
oil cooler

line is completely separate from the coolant so the overflowing there cant be from engine oil cooler. the trans cooler is a part of the radiator so if there is a failure there tranny fluid can go into the coolant. it would be pink then.

the rough running when hot, well, maybe it is running roughly all the time and is being masked by the warmup timing on the injection. idle too low? air in the lines?

does the mount move around like you first described still? are all the bolts in the mount?

the shocks can be changed wo jacking up anything. dont think they are the problem though.
__________________
[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.
Reply With Quote
  #13  
Old 07-20-2005, 11:56 PM
Registered User
 
Join Date: Mar 2005
Posts: 155
I'll order a new rack dampen pin tomorrow, from searching, I think the old type was silver, and the new type was gold? I have the silver one.

Well, when I saw my car leaked coolant, which was overflowing from the coolant resouvier, the temperature was nearly at 120.

The other thing I also wanted to ask is that, should the aux fan be turning on after 100? I've checked the aux fan, and it doesn't move freely when you tried to turn it by force. Compared to my 190, you cannot spin the fan without force.

The mount, the middle part where it holds on to the engine, when hot, that moves.like a boat. However, the car does not shake as if there's an earthquake after replacing the mount no matter if it's cold or hot. Only when its hot will it shake slightly.
Reply With Quote
  #14  
Old 07-21-2005, 09:27 AM
Craig
Guest
 
Posts: n/a
Quote:
Originally Posted by Schmohey
The other thing I also wanted to ask is that, should the aux fan be turning on after 100? I've checked the aux fan, and it doesn't move freely when you tried to turn it by force. Compared to my 190, you cannot spin the fan without force.
My 123 fan kicks in at about 100 (per the gauge) and spins very freely (i.e., it will spin very fast if you hit it with a water hose while washing car).
Reply With Quote
  #15  
Old 07-21-2005, 09:46 AM
Registered User
 
Join Date: Mar 2005
Posts: 155
I'll probably need a "new" aux fan. I'll test if mine is working first (probably not).

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
300D engine mount blues acy76 Diesel Discussion 31 11-08-2010 05:39 PM
Who has replaced the diff mount on a w123? GregS Tech Help 1 07-20-2005 11:29 PM
Engine Mount Opinion (please take a look) Rahulio1989300E Tech Help 9 02-18-2005 03:48 PM
W114 --> W123 engine swap cheech9 Tech Help 1 09-03-2003 08:12 AM
400e Engine mount ... help Tom400e Tech Help 3 01-19-2002 04:40 PM



All times are GMT -4. The time now is 08:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page