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How do you know if front pump seal is bad in transmission

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Posted on Jan 02, 2017

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SOURCE: 1995 Chrysler Concorde transmission diagram

There are 3 places it could be coming from. (1) The outer rubber seal on the pump between it and the case (2) The metal clad seal in the center of the pump that seals against the converter hub (3) And, the 5 bolts that hold the pump in have washers under them. The seal around the outside likes to get hard and brittle with age, especially if it has gotten hot before, leading to cracks that leak. The converter seal will wear naturlaly from doing it's job and more so if the pump bushing is wore out. The bolts that hold the pump in can get loose because of vibration letting oil out around the threads and out into the world.

If you pull it out and don't find loose bolts or obvious signs of a leak, then I suggest changin out all the places I mentioned. If you take the trans out and tip it on it's ****, then the pump comes out with a couple slide pullers. Be careful not to let the clutch-pack(inputshaft) slide out any, this will make going back together easier. There is a gasket between the inside of the pump and the case that will most likely need replaced too so get that as well; it seals all the ports and passages around the pump. Replace the outer square "O"-ring and the metal clad seal in the middle, then lube the outer seal and set the pump in place. Line it up and drive it in with the handle of any hammer. Torque it down(23ft. lbs.) with new washers for the bolts or new bolts with integeral washers. Be sure to loctite the threads as well to prevent them loosening up. Wiggle turn the input shaft to double check it isn't bound up and then just put it back in the car.

It sounds like a pain and it can be, but, it's easy after you do a couple thousand. Just like falling off a log. Hopefully you just have to do it once.

Posted on Nov 13, 2008


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