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 10-12-2013, 08:33 AM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Oily Mess Questions

Had the head gasket on my 92 300D replaced about 4,000 miles ago. The shop that did the work employs of couple of goons who made all manner of careless mistakes....had to take it back several times to get a variety of things addressed, one of which was an oily mess all over the right side of the engine. I was assured that this was due to the head gasket failure and that all would be well once they cleaned it up.

My son has had the car at college....just came back for the weekend. Lo and behold, the oily mess has returned and with a vengeance. BUT oil and coolant levels appear to be absolutely stable, so I'm thankful for that.

Since all levels are fine, is it reasonable to assume that the problem is exhaust related and nothing to be overly concerned about? Realistically, I probably won't be able to deal with it for a while.

__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #2  
Old 10-12-2013, 01:58 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,823
Exhaust leaks leave a sooty mess that needs to be scrubbed off. Recent engine oil residue usually comes clean with a spritz of brake parts cleaner.

If it's on the block below the exhaust manifold gasket, it might be leaking valve stem seals. How does it look around the turbo oil supply fitting on the block? How does it look where the drain pipe attaches to the turbo? How's the area around the chain tensioner? Is there a tensioner crush washer in the replaced parts list? Take a torque wrench to it to make sure it's tightened to spec.

How's the hood pad? I forgot to replace the oil filler cap once and it soaked a corner of the pad. Years later it still leaves oil on the rubber strip atop the air cleaner barrier.

Sixto
87 300D
Reply With Quote
  #3  
Old 10-12-2013, 03:13 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Here are some pics....may be kind of difficult to make out what I'm describing.
Attached Thumbnails
Oily Mess Questions-mess1.jpg   Oily Mess Questions-mess2.jpg   Oily Mess Questions-mess3.jpg   Oily Mess Questions-mess4.jpg  
__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #4  
Old 10-12-2013, 03:21 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,823
Do you have time to remove the air intake snorkel? That should allow more even lighting. Maybe hold the camera against the air cleaner barrier and shoot blindly towards the thermostat.

There seems to be some oil where the mixing pipe attaches to the head. Oil there can only come from a leaky valve cover, which looks dry.

Oil on the thermostat and alternator probably comes from the chain tensioner or #1 exhaust runner. Or, and hopefully not, the new head gasket isn't holding around the typical failure point.

Sixto
87 300D
Reply With Quote
  #5  
Old 10-12-2013, 03:35 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Unfortunately, not able to devote time to it today....and my son takes car back tonight. And I cleaned it up a bit after those pics were taken. However (and this gives me a sick feeling), it does seem to be particularly oily where the block and head meet on the front right side. Ug. The thought of taking it back to the place where the work was done is more than I can bear.
__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife

Last edited by shertex; 10-12-2013 at 03:46 PM.
Reply With Quote
  #6  
Old 10-12-2013, 03:43 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,065
Hmmm. Leaking timing chain tensioner...?

__________________
Dave
Boise, ID

Check out my website photos, documents, and movies!
Reply With Quote
  #7  
Old 10-12-2013, 03:51 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Is the chain tensioner the cylindrical thing in front of the exhaust manifold? Very, very oily just beneath it.
__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #8  
Old 10-12-2013, 03:54 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,823
It's in the center of your second picture. Big bolt that screws into the block in line with where the water pump attaches to the thermostat housing.

Turn it only by the wider flats close to the block. Don't touch the narrower flats on the outboard end.

Sixto
87 300D
Reply With Quote
  #9  
Old 10-12-2013, 04:01 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Quote:
Originally Posted by sixto View Post
It's in the center of your second picture. Big bolt that screws into the block in line with where the water pump attaches to the thermostat housing.

Turn it only by the wider flats close to the block. Don't touch the narrower flats on the outboard end.

Sixto
87 300D
Are you suggesting I try to tighten it?

If it is a leaking tensioner, is this in the category of a messy annoyance until I get it addressed or is there some urgency?
__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #10  
Old 10-12-2013, 04:08 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,065
You need to determine if the leak is from the tensioner, or from the head gasket itself BELOW the tensioner. The primary pressurized oil feed is in that exact location and it's a common place for OM60x head gaskets to leak oil. If the head is dry north of the block, it's the gasket leaking. If there is a lot of oil from the tensioner itself, could be the tensioner... there's supposed to be an aluminum O-ring seal between the tensioner and the head, sure hope they installed one.

Reply With Quote
  #11  
Old 10-12-2013, 04:08 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,823
A leaking tensioner might be of concern but the presumption is the leak is between the tensioner case and block, not between tensioner sections.

Sixto
87 300D
Reply With Quote
  #12  
Old 10-12-2013, 04:12 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,823
Spec is 80Nm which is 59 lbft.

Sixto
87 300D
Reply With Quote
  #13  
Old 10-12-2013, 04:15 PM
gsxr's Avatar
Unbanned...?
 
Join Date: Aug 2001
Location: USA
Posts: 8,065
Quote:
Originally Posted by sixto View Post
A leaking tensioner might be of concern but the presumption is the leak is between the tensioner case and block, not between tensioner sections.
Agreed. Note the tensioner screws into the cylinder head, not the block, btw.

Reply With Quote
  #14  
Old 10-12-2013, 04:22 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
Quote:
Originally Posted by gsxr View Post
You need to determine if the leak is from the tensioner, or from the head gasket itself BELOW the tensioner. The primary pressurized oil feed is in that exact location and it's a common place for OM60x head gaskets to leak oil. If the head is dry north of the block, it's the gasket leaking. If there is a lot of oil from the tensioner itself, could be the tensioner... there's supposed to be an aluminum O-ring seal between the tensioner and the head, sure hope they installed one.

Well, hopefully with the head gasket replaced for a leak at that precise point the head gasket itself is fine. We'll see.

I'll just have to swap cars with my son so I can address it.
__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
Reply With Quote
  #15  
Old 10-12-2013, 05:03 PM
Registered User
 
Join Date: Jul 2004
Location: Barrington, RI
Posts: 5,734
OK....I got curious. So I completely wiped clean the tensioner itself and the area of the head beneath it. So the whole area was clean and bone dry. Turned on the engine and it does not appear that there's any oil leaking from any part of the tensioner. BUT there appears to be fresh oil from under the lip of the head.

I think I'm going to be sick....

__________________
06 E320 CDI "Benson", Platinum Blue, 182k mi, Stage 1 tune, tuned TCU
06 E320 CDI "Rutherford", Black, 156k mi, Stage 1 tune
91 300D "Otis", Smoke Silver, 135k mi, wastegate conversion

19 Honda CR-V EX 30k mi
Thirteen other MB's owned and sold
1961 Very Tolerant Wife
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 03:44 AM.


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