I have studied the FSM and both the famous thread on rebuilding these PS gear boxes but neither seems to show where both orings go.

Does a rubber oring go beneath the white teflon band in this photo?

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84 300SD
85 380SE
83 528e
95 318ic

Is it Martureo who rebuilds steering boxes? He might know.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Yes, o-ring goes on first, then the teflon ring. Be careful as there's two o-rings of similar sizes. One of them is in the aforementioned location, the other is for the working piston cover to housing.

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Onus probandi incumbit ei qui dicit, non ei qui negat

I recondition w123/w126/w124/w140/r107/r129/ steering boxes!


1984 300D "Elsa" odo reset 6/2011 147k
1983 300TD "Mitzi" ~268k OM603 powered
1995 E300 "Adelheid" 262k [Sold]

One is slightly smaller than the other, that's the one that goes under the teflon ring.

Thank you for the help, sir.

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84 300SD
85 380SE
83 528e
95 318ic