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Old 12-09-2003, 02:31 PM
Registered User
Join Date: Apr 1999
Posts: 2,632
Question W124 replacing diff radial seal

If one is careful in removing the driveshaft output flange from the rear diff, is it necessary to replace the radial diff seal?

If so, are there any special measurements or tooling needed? I'm not dismantling the diff, just changing the driveshaft output flange. I was thinking with the proper drift, I can re-install the radial diff seal.

However, other than the proper torque, do I need to measure any play, or drag when re-installing the 12-point collar nut?

Thanks in advance,

:-) neil
1988 360TE AMG
1993 500E
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Old 12-09-2003, 06:03 PM
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Join Date: Apr 2001
Location: Jacksonville Florida
Posts: 723
You should be able to reuse the seal on the Diff
If You replace the Yoke please make sure that the Yoke is Clean
with NO Scratches / ridges to avoid a leak..Clean it with very fine sand paper..if any scratches...
Also Be VERY careful when Installing the Yoke..NOT to knock off the spring on the seal...If the spring is Knocked off You WILL have a Leak!

The Seal is NOT a big job to replace with the yoke removed!
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Old 12-10-2003, 11:32 AM
Registered User
Join Date: Apr 1999
Posts: 2,632
How do I measure the "friction torque" dry (oil drained)?

The docs specify 125-150 Newton-Centimeters. To convert to
Newton-Meters, do I simply divide that by 100?
If so, that's 1.25-1.50 Nm. Is that correct?

I did find the PDF's on the W124 CD-Rom (testing210.pdf and

Tech_Mod210.pdf (p.5) states to ALWAYS replace the pinion seal.

Moreover, as of 1/4/1998, an improved pinion seal (pn# 025.997.0047) and a improved flange provides better protection from contaminents. It also states that the OLD flange can be used with the improved seal.

Unfortunately, I don't think that is true (old flange w/new seal)
because the "improved" seal now has a "valley/dip" where dirt can accummulate IF used with the old flange. Only a new flange
($188-wholesale) has a longer/wider lip to protect the "valley/dip" from contaminents.

Since I'm swapping flanges, I'm concerned that the swapped flange with the old seal may leak. I'd change the seal in a heartbeat, but I don't want to spend $180+ IF I can trust the old flange can be used with the improved seal. Note: it doesn't leak, but this is swapped flange. . .

:-) neil

Old Seal w/Old Flange:

New Seal w/Old Flange:
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