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  #1  
Old 11-17-2011, 12:49 PM
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Which one is the O-ring?

in the oil filter shaft there seems to be 2 o-rings?

which one should I replace?

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  #2  
Old 11-17-2011, 12:58 PM
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Both. They're the same size O-ring, by the way.
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  #3  
Old 11-17-2011, 01:06 PM
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Quote:
Originally Posted by Orv View Post
Both. They're the same size O-ring, by the way.
both were hard as rocks. i was beginning to wonder if they were plastic!

so to replace do i just use a pick to pull it out and put new ones in? anything to watch out for?
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  #4  
Old 11-17-2011, 01:08 PM
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Yup, just get the old ones off. Make sure the slots are clean before you put the new ones on, and that you have the right size o-ring.
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  #5  
Old 11-17-2011, 01:39 PM
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Quote:
Originally Posted by Biodiesel300TD View Post
Yup, just get the old ones off. Make sure the slots are clean before you put the new ones on, and that you have the right size o-ring.
whunter buys the big metric O-ring pack from Harbor Freight for about 3 bucks )(?) and has enough O-rings for all MB applications. Invest and buy, you won't be sorry.
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  #6  
Old 11-17-2011, 02:46 PM
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Quote:
Originally Posted by Orv View Post
Both. They're the same size O-ring, by the way.
not true.

the same size will work, but the correct size is 7mm for the top ring, and 6mm for the bottom...
both have 2mm wall, so I use 6mm/10 for the bottom, and 7mm/11 for the top groove.
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  #7  
Old 11-17-2011, 03:19 PM
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oring kit

I just ordered all of the orings (and crush washers) that I need for my 95e300d fuel lines. i also have the Harbor Freight metric kit. I will cross reference using my micrometer and post something. Until I measure for myself, I am not convinced that the Harbor Freight kit contains EXACTLY the sizes required.
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  #8  
Old 11-17-2011, 03:53 PM
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Quote:
Originally Posted by vstech View Post
not true.

the same size will work, but the correct size is 7mm for the top ring, and 6mm for the bottom...
both have 2mm wall, so I use 6mm/10 for the bottom, and 7mm/11 for the top groove.
Why does the EPC show the same part number for both o-rings?

Do you have a reliable reference for the sizes that you indicated?
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  #9  
Old 11-17-2011, 03:57 PM
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They fit.

the pair of 6's the EPC lists, do not fit.
it's stretched too thin on the upper groove.

a pair of 7's leaves the lower groove too large, and the ring gets stuck or tears in the hole.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #10  
Old 11-17-2011, 04:02 PM
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Quote:
Originally Posted by vstech View Post

the pair of 6's the EPC lists, do not fit.
In my experience, they fit just fine.
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  #11  
Old 11-17-2011, 04:04 PM
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He's right, I think. The stem gets wider between them...the 6mm will work for the top one, but it gets stretched out.
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  #12  
Old 11-18-2011, 10:34 AM
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As usual VSTECH is right again. They are not exactly the same size.
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  #13  
Old 11-18-2011, 10:38 AM
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Quote:
Originally Posted by dablk1 View Post
As usual VSTECH is right again. They are not exactly the same size.
Define "they."

The o-rings specified by the MB EPC are the same size, even though the grooves are not.
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  #14  
Old 11-18-2011, 10:54 AM
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The O rings. If you look at the filter tube, you will actually notice that the shaft gets bigger.
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  #15  
Old 11-18-2011, 10:58 AM
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Quote:
Originally Posted by dablk1 View Post
The O rings. If you look at the filter tube, you will actually notice that the shaft gets bigger.
If you look at the EPC, you will actually notice that both o-rings have the same part number. Same part number, same size.

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