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Old 04-13-2016, 11:22 PM
Squiggle Dog's Avatar
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Join Date: Jul 2008
Location: Surprise, AZ, USA
Posts: 2,848
Is The 722.3 Secondary Pump O-Ring Supposed To Be Oversized?

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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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, 344,000+ Miles
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