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  #1  
Old 12-01-2010, 02:32 AM
Jeremy5848's Avatar
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OM603 Valve Seals - Mercedes vs. Aftermarket

I've been doing some research on OM603 valve seals in preparation for replacing the seals in my '87 300D Turbo (W124, OM603). There are considerable differences between Mercedes-branded seals and aftermarket seals and I don't just mean the price. [FastLane has the Mercedes-style seals for $24, AllPartsExpress has the aftermarket seals for $16, and the Mercedes dealer price is about $70.]

Mercedes-branded seals, shown in the first two pictures, carry a tiny Mercedes star and various numbers, the letters "GER" ("Made in Germany?") and "GOE" (the manufacturer?).

The aftermarket seals, shown in the third and fourth pictures, carry the Elring brand but no Mercedes logo. The exhaust seal is very similar to the Mercedes version but there's a real difference between the Mercedes and aftermarket intake seals. The aftermarket seal is shaped differently, doesn't have a metal shell, and has a larger outside diameter.

The two brands of intake seals are shown together in the fifth picture. One of them has to be the wrong size. Either the brown one won't fit or the red one will rattle around. It will be interesting to compare them to what comes out of the 603 head.

Jeremy
Attached Thumbnails
OM603 Valve Seals - Mercedes vs. Aftermarket-label_4565.jpg   OM603 Valve Seals - Mercedes vs. Aftermarket-seals_4563.jpg   OM603 Valve Seals - Mercedes vs. Aftermarket-label_4568.jpg   OM603 Valve Seals - Mercedes vs. Aftermarket-seals_4566.jpg   OM603 Valve Seals - Mercedes vs. Aftermarket-intake_4570.jpg  

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Old 12-01-2010, 02:55 AM
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Quote:
Originally Posted by Jeremy5848 View Post

The two brands of intake seals are shown together in the fifth picture. One of them has to be the wrong size. Either the brown one won't fit or the red one will rattle around. It will be interesting to compare them to what comes out of the 603 head.
I'm betting the brown one won't fit since you can usually depend on MB parts to fit right the first time.
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Old 12-01-2010, 04:12 AM
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The after market one will lack longevity. It will be like an oil seal without the spring ring.
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  #4  
Old 12-03-2010, 02:16 PM
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Another aftermarket seal set

Here's the seal set sold by FastLane. It's made by Hebmüller in Germany and costs about $30 including shipping. Both intake and exhaust seals are green and have a metal outer shell with a spring ring to keep the seal tight. They don't look quite as "polished" as the Mercedes-branded seals (the rubber portion is a little rough) but otherwise seem OK.

I'm still puzzled by the brown Elring intake seal in my first post. The outside diameter is clearly larger than the Mercedes and Hebmüller intake seals. It will be interesting to see what kind of seals are in my #14 and Sixto's #20 heads.

Next step is to get busy and finish the valve spring compressing tool.

Jeremy
Attached Thumbnails
OM603 Valve Seals - Mercedes vs. Aftermarket-label_4572.jpg   OM603 Valve Seals - Mercedes vs. Aftermarket-seals_4571.jpg  
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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #5  
Old 12-04-2010, 12:23 AM
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you know you titled the thread valve GUIDES right?
BIG difference between guides and seals...
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  #6  
Old 12-04-2010, 12:31 AM
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Dave already covered this situation many times.

It doesn't pay to be cheap when you overhaul a 603, especially on the valve seals...........or you'll be doing them again in another 75K or so.
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  #7  
Old 12-04-2010, 12:31 AM
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Quote:
Originally Posted by vstech View Post
you know you titled the thread valve GUIDES right?
BIG difference between guides and seals...
True -- my error -- meant to write "valve guide seals." Wish I could edit that.
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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #8  
Old 12-04-2010, 12:31 AM
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The seal in the last photo looks very much a generic NAPA seal, which were made by Perfect Circle IIRC.
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  #9  
Old 12-04-2010, 12:35 AM
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Quote:
Originally Posted by Jeremy5848 View Post
True -- my error -- meant to write "valve guide seals." Wish I could edit that.
All fixed..........
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  #10  
Old 12-04-2010, 12:43 AM
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GOE = Goetze?



I would just pay the extra $30-40 for the OEM ones. Cost is not much all things considered.
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  #11  
Old 12-04-2010, 12:56 PM
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I have to agree with the others. It is too much work and the job takes long enough (I did mine about 2 months ago) you do not want have to do it again.
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