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 05-22-2002, 02:34 PM
Registered User
 
Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65
(?) O-rings w/ oil change (240d)

Hello All,

Just did my 3rd oil change (since getting my car) last night on my 240d.. I keep seeing mentions on the board on how important it is to periodically 'replace the rubber o-rings'.. I think tho.. that i am missing them (?). The filters i have been using (Knecht/Mahle) have rubber pieces pressed in them on the top and bottom sections, are these the "o-rings" people are referring to? One forum posting sounded like there is supposed to be a o-ring on the bottom of a shaft somewhere (is it the canister lid shaft?) My canister lid does not seem to have any o-ring at all near at its base of the shaft. is this a bad thing? I do have a slightly noisy lifter tick it seems at times....


I greatly appreciate any help any of you can give on this.... thanks!

Miles
1980 Silver 240d

Attached Thumbnails
(?) O-rings w/ oil change (240d)-miles240d_1.jpg  
__________________
milesb@mac.com
Reply With Quote
  #2  
Old 05-22-2002, 03:32 PM
Registered User
 
Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65
Thanks for the info, Bill!,

Have i caused damage by not having the o-rings in place? [is the engine being starved of oil?] i'd say the car has been this way for approx. 5k miles.. I hope to get some replacements as soon as possible. would a MB dealer have them likely?

thanks so much for all you help!,


Miles
__________________
milesb@mac.com
Reply With Quote
  #3  
Old 05-22-2002, 03:41 PM
Moderator
 
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Miles81_240d

Attached is a cross section of the flow path in the filter and housing. The o-rings are items number 24 and 25, and, it is possible you are allowing the engine to run without oil flow to the bearings and so on until the filter housing fills with oil since the contents of the housing at engine shut down will drain through the unsealed area, and down through passage "c" to the oil pan. It is also likely that some of the pressurized oil is short circuiting the path out passage "b" which leads to the bearings and returning to the oil pan through passage "c" as well. If your oil pressure is coming up quickly and the pressure is steady you may be ok, but I would not leave these o-rings out of the assembly any longer. Hope this helps, Jim
Attached Thumbnails
(?) O-rings w/ oil change (240d)-oil-filter-flow-path-post01rot.jpg  
__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
Reply With Quote
  #4  
Old 05-22-2002, 03:54 PM
Registered User
 
Join Date: Apr 2002
Location: Portland Oregon, USA
Posts: 65
I second the Thanks! =) this is such a wonderful group! I will pick up some o-rings today....
Thank you all so much for the help!

-Miles
__________________
milesb@mac.com
Reply With Quote
  #5  
Old 05-22-2002, 04:04 PM
Registered User
 
Join Date: Sep 2001
Location: central Texas
Posts: 17,277
So, JimSmith, did you admit defeat on the oil filter pentagon effect ? Maybe a lack of these orings would cause that ??? Greg
Reply With Quote
  #6  
Old 05-22-2002, 05:13 PM
Moderator
 
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596
Greg,

It seems the one that was dissected had no center grommet at all. Or at least none was recalled, and that would have caused the sequence of events I was describing. I think TXBill noted he has seen filters with the center grommet loose inside the filter, which would also be a way for the bypass flow that normally exits down the center tube and passage "c" to avoid that high resistance path (look at the orifice the flow has to go through at the top of the center tube next time you change oil) and join the main flow. Such conditions would make the holes in the sheetmetal can on the bypass filter section be the throttling element of that new flow path, and cause the outer can to collapse. The idea that I proposed that the inner can might deform was pretty unlikely and actually may have been a red herring. The surface area for the pressure to act on is so much smaller than the outer can that such a collapse would not occur.

But, unkl300d, I think, did not have the can to look at anymore so we do not have any conclusive answer, just a vague recollection that there was no center grommet. The next time the phenomena gets reported we know what to look for. Sounds like some visual inspections are appropriate before installing these filters, although I have to admit I have never really looked at them hard in the past.

Glad to be of help, TXBill and Miles81_240d, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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 12:21 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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