We are learning, as others are, that these parts are becoming a HIGH preventative maintenance item on these old transmissions. A broken or binding B2 piston causes many shifting problems, and as Kent found on his 300E, it destroyed the transmission.
Product Details
The revised B2 can add life to your old transmission. Access is on the right side of the transmission through the big cover plate. In all models except the W126, the transmission should be removed. We believe it should be removed in any case since there will be other seals and o-rings you should replace that may be leaking. IMPORTANT NOTE: Install the black seal with the flat face going in on top of the edge of the sleeve.
The kit includes:
- Genuine B2 piston upgrade - newest version
- Genuine Nylon sleeve replacement
- Genuine piston seal (install flat face going in)
- CRP cover o-ring
- Lint-free cloth
- Blue nitrile gloves
The piston will come out easily by hand with no special tools. But the removal of the internal sleeve and seal will require some type of puller. A slide hammer is the quickest and easiest, as you do not need to remove the pan and the valve body.
WARNING: You will not be able to get the old sleeve and seal out without some type of special tool. We offer a quick and easy-to-use slide hammer tool that will not damage the transmission case. See related products below to order separately
Related Products:
722.3 722.4 B2 Seal/Sleeve and Front Pump Removal Tool Kit
We modified this slide hammer puller set in our shop so it will work in removing two key components in the 722.3 and 722.4 automatic transmissions. Getting the B2 piston and sleeve out of the case can be a real bear without this tool. With it, it comes out quickly and easily.
Automatic Transmission Removal and Replacement .pdf download by Kent Bergsma
If you mess around with older Mercedes sooner or later you will be faced with having to remove a transmission. This can occur when you discover your transmission is leaking out the front pump seals, the torque converter flex plate has failed, or the transmission itself has gone bad.
722.3 Complete Overhaul Gasket and Seat Kit
Take a very close look at the picture. These are all the gaskets and seals you will need to replace if you open up your 722.3 transmission that was produced from 1981 to 1995 for all 6 and 8 cylinder passengers cars that had a displacement of 3.0 liters of more.