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Old 06-05-2003, 03:25 PM
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Join Date: Nov 2000
Location: Houston, TX, USA
Posts: 185
400E R/R cam seal procedure?

Hey techs...

On my 92 400E, Alldata calls for a special tool and a shop made tool to R/R front camshafts. Can this be done without the tools? Is it an easy procedure once you remove caps & rotors?

Thanks much...Peter

Peter Balias
1992 400E
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Old 04-01-2009, 12:18 AM
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Join Date: Dec 2005
Posts: 6
I have the same question. Does anyone know what the job entales to R&R the Crank seals on a 92 400e?
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Old 04-01-2009, 01:08 AM
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Join Date: Nov 2005
Posts: 48
I did it without the special tools. Just make sure you don't lose your timing!!!! Mark the gears and the camshaft so you know how it goes back together! Also note that as soon as you get the chain off one of the camshafts, the other will spin and most likely jump timing! So be sure to mark them all! I only marked the cam I was removing, and low and behold, the other one jumped timing. Which meant I had to use a dial indicator to get it back. yucky. Try to avoid that. Other than that goof, it was a straight-forward procedure. Just follow the procedure and you'll be okay.
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Old 04-05-2009, 11:29 PM
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Join Date: Dec 2005
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Would someone please post the proceedure here. Thanks!
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Old 04-06-2009, 12:59 AM
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Join Date: May 2007
Location: Arizona
Posts: 760

You don't have to mess with the timing chain or sprockets to change the cam seals. I replaced mine along with resealing the front head covers, because I couldn't tell whether the leak was coming from the cam seals or the head covers, where metal meets metal. The dealer's tech said that 119's are notorious for leaking at the front head covers.

If you are leaking in that area, even if you can get the cam seals out without removing and resealing the front covers (it looks like you can), if you're in that far and you already have the valve covers off, it makes sense to consider pulling the front covers and resealing them.

Once the front covers were off, the cam seals are easy to get out (no tool required). The cam seals fit over each exhaust cam. You will have to take off the rotors and caps to get to them. Looking at my picture that I took of the front cover, it looks like the seals actually came off with the front cover and can easily be pushed right out (I took the picture in 2001 before I had a digital camera).

You can probably get the new seals in without the tool, but I ordered the tool from the dealer and it wasn't very expensive if I recall. The most expensive part of the job was the MB factory orange sealant (part # 002 989 00 20 10). That cost me about $55 back in 2001. Some have argued that you can use a cheaper sealant, but just to be safe, I went with the factory stuff (8 years afterwards there were still no leaks).

1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles
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