Quote:
Originally Posted by Kyngfish
The leak seems to be coming from the perforated housing between the engine and trans. So I'm assuming that means front seal. Is that not correct?
The engine has 240k miles, and I figure with the engine out I should just go ahead and do the head because I already have it out. Also I think I'm leaking oil from the head gasket as well. There's an oil leak somewhere, though it could be the valve cover gasket.
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I am presuming it is an automatic transmission.
I am in the process of doing this but got stalled by having to work on other vehicles. That means my Trans is partially apart.
Mine leaks front and back and I believe where the shift shaft comes out of the side of the transmission.
In the Front Kent from Mercedes Source suggests that as well as the Seal the Pump O-ring and or gasket can go bad and cause a leak.
In order to get those off you need to remove the Front Pump and take it apart. In order to do that when the Front Pump comes out the Reverse Piston is attached to it.
To get the Revers Piston off you need to depress a spring plate in order to get out a retaining ring. Once that is off you can get at the bolts behind the front pump and take the front pump apart to get at the O-ring.
What I found is that O-ring was so stiff it cracked on removal. So I am glad I took the effort to look. I am also replacing the 2 seals on the Reverse Piston which seemed somewhat inelastic.
Also inspect the pump front bushing. If it is too worn that allows more pressure to be applied to the front seal. Also there is where the seal lip rids on the Torque Converter.
I have not replaced anything yet as I have not ordered parts.
Due to age you might consider replacing the B2 piston rubber lip seal and because you removed the cover you will likely need a cover O-ring.
I am not sure what updates were done by your year and model in the B2 piston area.
On my 84 300D the Aluminum Bushing is replaced by a updated Nylon one, the mentioned Lip Seal and in my case the B2 Piston itself (mine was broken) with the updated Piston and of course the mentioned cover O-ring.
I am replacing the shift shaft bushing because there is not a lot of room to do it on the vehicle and it does not cost much.
I can't remember if it takes a 30 or 32 mm 12 point deep socket to get the output shaft yoke off of the rear of the transmission.
On mine Mercedes does not have a part number for the front pump bushing but it is available from other sources. With a visual inspection I believe I will be leaving it alone.