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  #1  
Old 03-25-2015, 02:31 AM
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W108 1967 M108.920 Exhaust Flange Gasket

Need some help figuring out exactly what kind of gasket this is. Is it a donut gasket, or an o-ring like gasket?

Both of my flanges are leaking air. I have not taken them apart because I think I may have to destroy the old bolts to save the patient. So, I need to get all of my ducks, and equipment, in hand before any surgery

I have not seen one of these on the Pelican Parts site. The Mercedes Parts Catalog "A" (1965) 12_110, [page 130), shows a donut looking gasket. But, using ebay, I get o-ring like gaskets in my search results. I can not imagine this connection is made so that one could use either shaped gasket.

Here is a pic from the Mercedes catalog, and a photo of my exhaust flanges.

engine: 1967 250S M108.920

Thanks in advance

ps: Yet another step in eradicating gas smells while driving, and after parking in the garage.

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W108 1967 M108.920 Exhaust Flange Gasket-1967250s_0037.jpg   W108 1967 M108.920 Exhaust Flange Gasket-exhgskt055cweb.jpg  
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Old 03-25-2015, 07:02 AM
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The catalog shows a gasket, so I'm guessing there should be one, but when I had my 240D apart years ago, there was a similar connection with no gasket of any kind.
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Old 03-25-2015, 11:29 AM
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That "gasket", from the rust on it, appears to be a sintered iron donut. With a through cleaning of the mating surfaces of the pipe and manifold, those donuts are usually re-useable.
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Old 04-12-2015, 03:22 PM
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Thanks for both responses. I have not tackled this repair yet, maybe next weekend. Got to get new bolts and nuts before I take the old ones off. Will follow up. thx
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Old 04-12-2015, 06:43 PM
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it should be a thin metal donut filled with fiber. cross section of the donut will be about the same as the inner diameter of the hose you replaced in the other thread.

While you have it apart, replace the nuts and bolts. The correct nuts are slightly eccentric and are made of a bronze alloy.

-cth
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Old 07-19-2015, 10:56 AM
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Aargh!

Quote:
Originally Posted by cth350 View Post
it should be a thin metal donut filled with fiber. cross section of the donut will be about the same as the inner diameter of the hose you replaced in the other thread.

While you have it apart, replace the nuts and bolts. The correct nuts are slightly eccentric and are made of a bronze alloy.

-cth
Sorry for the long delay in getting back to this. Your last point about the bolts is now the problem. I was able to get the bolts/nuts on the near-side exhaust flange un-frozen with a lot of WD40. Sadly the nuts were quickly rounded off by my wrench. Then the bolts would rotate freely by hand; but could neither tighten or loosen. Used a stubby hacksaw to cut the top 2 bolts. Installed Grade 8 bolts, spring washers, and nuts to replace those 2.

Problem: I can not access the 3rd bolt, the one on the bottom that you can't see ---- How to get this off?!

No room for my stubby hacksaw. No room for my 3/8" drill with a grinding attachment. Can not see how to access from beneath the car b/c engine mount arm. Would a Dremel-like tool fit and do the job?

Aargh!! At least it's just some exhaust fumes; not dripping gasoline
(Yes, I removed the entire air filter assembly.)

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