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Old 08-18-2003, 05:32 PM
Registered User
Join Date: Jul 2003
Location: Tulsa
Posts: 304
Camshaft Seal Replacement

After changing the distributor caps and rotors on my 92 400SE, I noticed a small oil leak into my rotor caps. I have plans to change the camshaft seals.

Below is information I found on how to perform the camshaft seal replacement.

My question is, can I get the new camshaft seal seated correctly without the special MB tool 119 580 00 14 00 referenced in the below information?

Also, when I put back the front cam covers should I seal covers with special paste, oil resistant high temperature automobile silicone.


Remove Distributor Driver (also known as "Follower at Camshaft").
Fit insertion sleeve (7) on to exhaust camshaft (10), special tool 119 589 00 14 00.
Coat sealing lip of radial seal (1) with engine oil.
CAUTION: Do not use grease. Grease prevents the return delivery swirl on the sealing lip of the radial shaft seal (1) from transporting back the engine oil.

Fit radial shaft seal (1) onto insertion sleeve (7).
Press radial shaft seal (1) in with sleeve (8) (shop-made) to size"A" = 5 mm".
NOTE: The radial shaft seal (1) must be positioned vertically to the camshaft (10) in order to provide a proper seal.

Remove holder of shield caps of high tension distributors.
Press radial shaft seal (1) out with a screwdriver.
CAUTION: Do not damage camshaft (10) and mounting hole for radial shaft seal (1).

Attached Thumbnails
Camshaft Seal Replacement-camshaft-seal-replacement.gif  
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Old 08-18-2003, 10:17 PM
Meza's Avatar
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Join Date: Jan 2003
Location: SC
Posts: 148
No you don't the MB tooll

On my 190e 2.6, I got seal press kit from Harbor Freight (Check their web site). The kit is nothing but a set of round plastic pieces (different diameters for different seal sizes) with a hole in the middle. Like the Chips in a Casino. Sandwich the seal between two pieces out the kit, then stick a long bolt throught the whole thing and tighten the nut. The seal will press in the hole as you tighten the nut. This will provide even pressure around the seal. You can fabricate your own tools. You may try big and flat washers. When removing the old seal DO NOT SCRATCH THE SEALING SURFACE. I use loctite 5999 to seal the cover. The MB sealant is Loctite 5990. Both are pretty much the same. I ordered a 300 ml tube where I work from a usual supplier. Any other good quality sealant may work. I personally prefer Loctite products. Visit their web site (

Note. You may need to carfully work the seal around the camshaft with a small screwdriver as you put the cover back. I had to do this several times until I got it right.
1993 190E 2.6
Advanced Diesel Systems Test and Research Engineer
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Old 09-23-2004, 09:57 AM
meldwyer's Avatar
Registered User
Join Date: Jun 2003
Location: phila
Posts: 53
cam oil seals replacment 1994 s/420

hello,, i would like to know if you have to use the mb,paste,for sealing,,, of the oil seal,s when replaceing,,thethe seal,,behine the distb/cap /rotor and is this spaical/tool needed for the seal to be placeed,,, this my frist time doing this job any advise will be very helpful,,, iam,sick of oil leaking on my new altornator,,,, help please,,,, thank you,,, mel dwyer 94/S420 207,000 MI,
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Old 09-23-2004, 11:09 AM
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Join Date: Jul 2003
Location: Tulsa
Posts: 304

No, the MB "special sealant" isn't necessary when replacing the camshaft seals. I used a thin weight oil when re-incerting the new camshaft seals for ease of propper fittement. DO NOT use grease on the inner "swearls" because it will compromise the sealing properties.

I attempted to replace the camshaft seals without removing the upper timing covers, but due to the heat and age the seals were tightly affixed. Fearing I would scratch and damage the area while attempting to remove the seals, I choose the path of removing the upper covers. I will list both procedure below.

Replacing Camshaft seal with upper timing chain cover removed.

* Left front cover (30a): Remove cap (23) and filter (18) at reservoir (13) of power steering pump.
* Left front cover (30a): extract oil in reservoir (13) with hand pump, special tool 112 589 00 72 00.

Installation Note : Fill power steering pump and bleed.

* Left front cover: Unbolt oil line (15).

Installation Note : Replace 0-ring (14).

* Left front cover (30a): Unscrew bolts (17) (Torx E8).
* Left front cover (30a): Remove reservoir (13) with gasket (12).

Installation Note : Replace gasket (12) according to condition.

* Unplug connector of solenoid (Y49) of camshaft adjuster.
* Unbolt bracket of cover (1) or (1 a).

Installation Note: Clip ignition cable and ignition cable duct into bracket of cover (1) or (1a).

* Unbolt and remove front covers (30) and (30a).
* Clean sealing surfaces.
* Coat front covers (30) and (30a) at contact surfaces to cylinder head with sealant 002 989 47 20 10.
* Coat bolts (28) and (29) with sealant 002 989 47 20 10.
* Fit insertion sleeve (01) onto exhaust camshafts, special tool 119 589 00 14 00.
* Install and bolt on front covers (30) and (30a). Tighten to (21 Nm).
* Remainder of installation is reverse of removal procedure. Observe all installation notes and tightening specifications.
* Check leaks with engine running.

Tightening Torques:
Bolts of front covers 25 Nm
Reservoir at power steering pump (Torx E8) 9 Nm
Attached Thumbnails
Camshaft Seal Replacement-camshaft-remove-frnt-cover.gif  
Russell McMahon
Tulsa, OK

2001 CLK 320
1992 400se
1993 400e
2000 320ML
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Old 09-23-2004, 11:20 AM
Registered User
Join Date: Jul 2003
Location: Tulsa
Posts: 304

I used the loctite 5999 to seal the upper timing covers. I too had oil leaking from the distributor area - both the camshaft seals and the upper timing covers.

Removal and Installation of the distributor caps to gain access to the camshaft seals.

This might be of help too.....

* Remove and install intake air hose.
* Model 124: remove and install air scoops.
* Unclip and take off shielding caps (1) and (1a) at the side.
* Unbolt high voltage distributors (2) and (2a).
* Unbolt distributor rotor (3). Tighten to 2.5 Nm on reassembly.
* Unbolt driver (4). Tighten to 9 Nm on reassembly

Installation Note: The slot of the driver (4) must engage in the locating pin in the camshaft.

* Take off protective cover (5) together with seal (6).
* Installation is reverse of removal procedure. Observe installation note and tightening torques.
Attached Thumbnails
Camshaft Seal Replacement-distshaft.gif  

Russell McMahon
Tulsa, OK

2001 CLK 320
1992 400se
1993 400e
2000 320ML
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