Can someone confirm the exact location of the infamous O-Ring on timing cover? The only o-ring I see is between the fan bracket and timing cover. The o-ring is in the same bolt hole that the "y-bracket" attaches to with sealant on both sides. Can anyone confirm? Also, Fastlane sells an o-ring between the timing cover and crankcase(see attached link below). But I don't see any o-rings between them. I want to get this right since I'm trying to eliminate all oil leaks on the front end. Thanks for any help.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1O40VKYKM1O617BN7M&year=1991&make=MB&model=190-E-005&category=All&part=Timing+Cover+O-Ring

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1991 190e 2.6 190,000mi

When I did my upper timing cover, there was an o-seal that went around the camshaft, but it was hardly an o-ring. It was a regular radial seal complete with lip, etc. ala main crankshaft end seal.

Is this what you're talking about?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

There is an O-ring in the timing cover, but oil leaks usually occur at the cover's U-gasket. That needs special sealant in the corners. Search "upper timing seal cover"--hundreds of messages on the topic...

TeeJay, I'm pretty familiar with the u-gasket problems. Too familiar! Do you know where that o-ring is in the timing cover? I've read a couple of threads about it but want to make sure I replace it while i have things apart.

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1991 190e 2.6 190,000mi

I looked at this job and I think the only o-ring seal you need is the one you mentioned -- the bottom right bolt that goes through the tensioner Y-bracket then the fan bearing bracket and into the timing cover. It does indeed go thru the timing cover and into the crankcase but I think Fastlane is just vague by not mentioning the bearing bracket.

I see no others mentioned in the job, although this is from a '91. What year is your 103?

If there is another seal on the cover, my bet is it would be one of the 105's as seen in the pic.

Good Luck

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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi

pmizell, mine is a '91 as well. Thanks for the great reply with diagram. I guess there is only one o-ring at that location. Also, I'm glad I wasn't the only one that thought the fastlane ad was misleading. I'll go to the store tomorrow and buy a new o-ring. I hope it makes a difference. At least it will give me peace of mind when I start the car again for the first time.

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1991 190e 2.6 190,000mi