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 09-15-2014, 11:36 AM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Help! My 73 220D is running rough w/ white smoke

Last time I went to take my 220D for a ride, I noticed a very rough idle and white smoke from the tailpipe.

The smoke is not coolant smelling.

Also, while driving, I can feel a noticeable miss. The engine shakes at idle. The engine mounts are new.

I've narrowed it down to the #3 and #4 cylinders by cracking each fuel line loose at the injector while the engine is idling. The #3 and #4 makes little to no change in engine idle.

Things I've Checked
  • Compression is 300-310 psi
  • Valve lash is correct
  • IP timing is correct
  • Injectors are new Monarks
  • Spray pattern looks good
  • Swapped out injectors with known good ones, problem stays at #3 and #4cyl
My question is, could the prechambers be causing the problem? I'm not sure what else to check.

Any ideas?

Thanks in advance!

Reply With Quote
  #2  
Old 09-15-2014, 09:40 PM
Registered User
 
Join Date: Jul 2008
Posts: 3,740
Could be a torn vacuum pump diaphragm or the diaphragm in the governor on the back of the injection pump. Both these can cause oil burning resulting in smoke...governor can result in ruff running and increased fuel output...
__________________
Reply With Quote
  #3  
Old 09-16-2014, 01:14 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Could just be poor quality fuel
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #4  
Old 09-16-2014, 07:19 AM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Quote:
Originally Posted by cooljjay View Post
Could be a torn vacuum pump diaphragm or the diaphragm in the governor on the back of the injection pump. Both these can cause oil burning resulting in smoke...governor can result in ruff running and increased fuel output...

The vacuum is pulling suction and the lines are bone dry. I used a small hand pump with gauge to test the gov on the back side of the IP. It held pressure.

The IP looks pretty new, I believe it was replaced by the previous owner.
Reply With Quote
  #5  
Old 09-16-2014, 07:21 AM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Quote:
Originally Posted by Stretch View Post
Could just be poor quality fuel
Good point. I am using Jet-A with a lubrication additive. I know the Jet-A is good quality. It's basically like a kerosene...
Reply With Quote
  #6  
Old 09-16-2014, 08:52 AM
Quahog's Avatar
likes plumb bows
 
Join Date: Nov 2010
Location: Portsmouth, RI
Posts: 633
this

Quote:
It's basically like a kerosene...
how about trying a tank full of regular pump diesel?

i'm guessing jet A is too thin & getting where it doesn't belong.
__________________
1991 300D

Reply With Quote
  #7  
Old 09-16-2014, 09:41 AM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Quote:
Originally Posted by Quahog View Post
how about trying a tank full of regular pump diesel?

i'm guessing jet A is too thin & getting where it doesn't belong.
That's a good idea. The problem did start when the tank got around 1/4 full. Before it was a mix up diesel and Jet A. Maybe the concentration got too strong.

I'll fill it up with some regular diesel and see what happens.

I run Jet A in my truck (F250) and I know quite a few people who run it in their vehicles but maybe the OM615 doesn't like it.

Thanks for the help!
Reply With Quote
  #8  
Old 09-16-2014, 11:18 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Quote:
Originally Posted by juandigital View Post
Good point. I am using Jet-A with a lubrication additive. I know the Jet-A is good quality. It's basically like a kerosene...
Even if it is super-duper top of the line diesel if it has too much water in it then...
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #9  
Old 09-16-2014, 06:06 PM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
On the return hose from the IP back to the fuel filter canister, I do find tiny air bubbles (like champagne) when the engine is running. I believe it is a return hose since it flows back to the fuel filter.

Do you think this is normal?
Thanks

Never mind the #3 and #4 fuel lines disconnected.
Reply With Quote
  #10  
Old 09-17-2014, 01:40 AM
Stretch's Avatar
...like a shield of steel
 
Join Date: Sep 2009
Location: Somewhere in the Netherlands
Posts: 14,461
Is is normal? Well I think I have to be careful with this one! It does happen quite a lot - but it isn't meant to be like that (some people think "because they are all like that" it is meant to be like that)...

...check for leaks and re-bleed your system. Those over flow pipes from the injectors look non standard - might be a good place to start.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
Reply With Quote
  #11  
Old 09-17-2014, 04:44 PM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Quote:
Originally Posted by Stretch View Post
Is is normal? Well I think I have to be careful with this one! It does happen quite a lot - but it isn't meant to be like that (some people think "because they are all like that" it is meant to be like that)...

...check for leaks and re-bleed your system. Those over flow pipes from the injectors look non standard - might be a good place to start.
Thanks Stretch, I've checked for leaks but haven't found any yet. Those injector return lines are non standard for sure. I suspected the old ones as being bad so I put some temp ones on for troubleshooting. One of them is clear so I can see fuel flow. Mine definitely does not flow much fuel.
Reply With Quote
  #12  
Old 09-17-2014, 06:05 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,038
I would get something like one of those 2 Liter Gas Cans and some extra Fuel Hose and try runing it from the Can filled with Diesel Fuel. Just for testing.

You als might run a long hose from the Fuel Return to a similar container and see if you are getting Air Bubbles out of it.

As you were saying an Air leak can cause the symptoms as it will mess with the Injector Spray pattern and make tne Injection Time later.
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #13  
Old 09-17-2014, 06:08 PM
Diesel911's Avatar
Registered User
 
Join Date: Sep 2007
Location: Long Beach,CA
Posts: 51,038
Quote:
Originally Posted by juandigital View Post
Last time I went to take my 220D for a ride, I noticed a very rough idle and white smoke from the tailpipe.

The smoke is not coolant smelling.

Also, while driving, I can feel a noticeable miss. The engine shakes at idle. The engine mounts are new.

I've narrowed it down to the #3 and #4 cylinders by cracking each fuel line loose at the injector while the engine is idling. The #3 and #4 makes little to no change in engine idle.

Things I've Checked

  • Compression is 300-310 psi
  • Valve lash is correct
  • IP timing is correct
  • Injectors are new Monarks
  • Spray pattern looks good
  • Swapped out injectors with known good ones, problem stays at #3 and #4cyl
My question is, could the prechambers be causing the problem? I'm not sure what else to check.

Any ideas?

Thanks in advance!
Was the compared compression of #3 and #4 exactly the same?
__________________
84 300D, 82 Volvo 244Gl Diesel
Reply With Quote
  #14  
Old 09-21-2014, 09:36 PM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
Quote:
Originally Posted by Diesel911 View Post
Was the compared compression of #3 and #4 exactly the same?
ok,

rechecked compression
1. 250 psi
2. 260
3. 290
4. 300

I also checked timing chain stretch to be 10 degrees. So I assume this isn't helping my problem. I will probably go ahead and order a new chain.

I also ran across this thread
White smoke...Uh ohhhh | Mercedes-Benz Club of America

It's pretty much what mine is doing. I'm wondering if the #1 #2 cylinder head gasket could be compromised allowing oil to enter.
Reply With Quote
  #15  
Old 09-21-2014, 10:21 PM
juandigital's Avatar
Registered User
 
Join Date: Jun 2014
Location: Flint Michigan
Posts: 11
compression was checked on a cold engine

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




All times are GMT -4. The time now is 08:49 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page