I'm rebuilding a 722.3 transmission and have a German VAICO transmission seal kit. I put the large O-ring that goes between the transmission bore and the secondary pump housing in place, but it seemed slightly too big. It fit into place and looks alright, but there is a slight deformation from it being too large. But it will probably work okay, I hope.

Now the real issue is the little piston cover in the housing. The O-ring that came in the kit seems to be too large. So I ordered both available sizes from The Classic Center because there are apparently two different O-rings depending on when the pump was manufactured. I ordered both.

The first edition O-ring is a little too large for the housing so it deforms. It may work, but it doesn't seem right. The second edition O-ring is even larger and thicker and definitely doesn't fit.

Has anyone else experienced this and had it seal okay? It would seem odd that Mercedes would specify a seal that's slightly too big.

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DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles

Resurrecting a very old thread… did you ever get your answer Squiggle Dog?

Member “squiggle dog” passed away a couple years back

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

Awww man RIP