My last oil change 300SD, I did not have any tiny O-rings - PeachParts Mercedes-Benz Forum

LNGfish · #1 02-26-2009, 10:57 PM

When I was doing this job last I remember pulling out a long rod like thing and seeing atleast one o-ring on this rod. There may have been two, not sure. Anyway my filter kit had no such tiny o-rings so I just reassembled it but I want to get these for my next oil change. I did not even touch them but they looked worn.

I read about these getting brittle and need changing. My oil pressure is fine on idle. In center of range when hot then pins when I take off.

My question is:

1. How many are there on this rod. One or two?
2. What are they for.
3. I can't find them at Phils, anybody can find them for me? I'd appreciate it.

I see others get them at hardware store but I'm not sure what size or material to get. Anybody's help would be appreciated.

bgkast · #2 02-26-2009, 11:06 PM

Just do it next filter change.

LNGfish · #3 02-26-2009, 11:15 PM

Yes I plan on replacing next time. Thanks for reply bgast.

They did not come in my filter kit.

I looked at Phils parts and I don't see them listed there.

bgkast · #4 02-26-2009, 11:30 PM

Get one of these kits for your next change: http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1982%40%401982&makeid=63%40%40MERCEDES%2DBENZ%40%4063&modelid=6206%3AMBC%7C1510%3AED%7C10000134%40%40300SD&keyword=filter&subcatid=P:240348@@Oil+Filter+Kit&mode=PA

Diesel911 · #5 02-27-2009, 12:48 AM

The size of the 2 O-rings is 6x10x2mm. Internet part sellers have them and sompleace like the local NAPA may have them.

toomany MBZ · #6 02-27-2009, 07:00 AM

Yeah, they'll be OK, and any auto parts store should have 'em.

LNGfish · #7 02-27-2009, 07:23 AM

Thanks guys for the replies. I'll check into Kit and NAPA.

LNGfish · #8 02-27-2009, 07:27 AM

That link is dead. I'll ask Phil when I order when I get my list made up. That pulls up cooling system parts but thanks anyway. I wrote down the size that will help me. Not really sure what they do but they are there for a reason I'm sure. Thanks

tyl604 · #9 02-27-2009, 09:52 AM

I have tried two of these links this AM for Phil's parts and both were dead. Maybe it is a problem with Phil?

JonL · #10 02-27-2009, 10:36 AM

Quote:

Originally Posted by Diesel911

The size of the 2 O-rings is 6x10x2mm. Internet part sellers have them and sompleace like the local NAPA may have them.

Are you sure they are both the same? I replaced mine in my OM602 some time ago, seem to recall there were two sizes. Maybe different for different engines....

vstech · #11 02-27-2009, 11:26 AM

nope, they are NOT the same size. you can use same size, but one will be stretched out.
the larger one is 7/11mm

Diesel911 · #12 02-27-2009, 11:38 AM

Quote:

Originally Posted by JonL

Are you sure they are both the same? I replaced mine in my OM602 some time ago, seem to recall there were two sizes. Maybe different for different engines....

I do not know about the OM602 but when you go to *************** and run my 84 300D trhough their parts search they show that the car needs 2 of the 6x10x2mm O-rings for my vehicle. They show no other size. And the 1 size works.
Also the other part places I have checked show only 1 part number for the O-rings that go on the bottom of the Oil Filter rod/stem.
At the Russian EPC site the show item #182 Seal Ring part 0159979448 as 2 each and no other size listed.
http://www.detali.ru/cat/oem_mb2.asp?TP=1&F=123130&M=617%2E912&GA=722%2E118405&GM=716%2E005++++++++++++++717%2E400&CT=M&cat=143&SID=18&SGR=045&SGN=02

Perhaps someone who can access the Mercedes EPC site will verify this.

However, one of our Members on his own has gone to the trouble to find a larger O-ring for the upper one. Maybe he will read this thread an pass on the size he used. He has a post somewhere on this.

nickofoxford · #13 02-27-2009, 11:51 AM

I got mine from dieselgiant's site. Im pretty sure my engine ate them because I did my first oil change after I bought the 240d and they were nowhere to be found..

*EDIT* The forum keeps eating the link, I sent it to you in a PM

JonL · #14 02-27-2009, 12:27 PM

BTW, as to the function... If I recall correctly (and I may not because I don't have as many brain cells as I once did), when I changed mine I concluded that the o-rings separate the oil flow to the two parts of the filter. The diesel filters have a full-flow section and a bypass section. All the oil going to the bearings passes through the full-flow section unless the filter is plugged or the oil is too cold to pass through it, in which case a bypass valve - no relation to the bypass filter - will allow unfiltered oil to the bearings, as unfiltered oil is better than no oil. The bypass filter is a much finer pore size and gets a smaller amount of oil flow that I think is simply returned to the sump. The idea of the bypass filter is that it keeps cleaning up the oil in the sump, mainly for soot control. The full-flow section protects the bearings from the big chunks. If the o-rings are worn or missing, the oil flows will mix and the filter will not do its job properly. I don't think it is catastrophic, but it isn't good.

fdanielson · #15 02-27-2009, 02:16 PM

You can get them through Fastlane. Try this link - http://catalog.peachparts.com/item.wws?sku=W0133-1644350&itempk=77321&mfr=REI&weight=0.02