PeachParts Mercedes-Benz Forum - 300TD B2 piston replaced, still no forward movement

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)

- Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)

- - 300TD B2 piston replaced, still no forward movement (http://www.peachparts.com/shopforum/diesel-discussion/385909-300td-b2-piston-replaced-still-no-forward-movement.html)

Quote:

Originally Posted by ROLLGUY (Post 3708441)

Yes, definitely a mystery. It was fairly easy to remove the valve body, actually easier than I thought. Seeing for sure that both ends of the band were where they should be was comforting, but NOT finding the problem is irritating. Kind of bitter-sweet. One good thing I can take away from all this is that I am learning about transmissions, things that I may not ever learn any other way.......Rich

Well you know more then me. I have only done the B2 Piston job and of course fluid and filter changes.

The various valve springs inside of the valve body have been known to break.
But, as you said it is too the point where you are expending lots of time on the issue.
I am stuck on a transmission issue like that with my Van. I have the genuine Chevy service manual and there is nothing in the Manual about what you need to remove before you pull the Pump off.
With a lot of difficulty I got the Pump off only to find that there was 3 items sticking through the Pump that should have been removed that I sheared off. That is right I unknowingly cut off all three. A steel tubing, a kick down solenoid and and the neck of the Filter.

I damages a bushing and bent the input shaft. That is all the damage I know about so far.

The only good news is that I found loose bushing in the Pump.

I have been fooling with that for a couple of hours each day for 2 weeks.

It is looking like by the time I get the stuck bent input shaft and drum out I am 1/2 way towards a complete rebuild.
Anyway I feel your pain on the transmission issue.

I'm starting to like the theory that some pieces of the B2 are jamming up the valve body or some other critical piston.

This sounds tough. I fixed my B2 and it looked just like yours. My trans died 1.5 years later with some really hair raising temporary failures on the way (freewheeling in hot stop and go traffic). Finally I took the car to Marc at Sun Valley and got a new trans. It was the best money I ever spent. That car rocks now. I wrote about the experience in the forum.

Yes, they are super busy. It is a seller's market because it is a great price for a great product. You have to just wait. But OMG I love my new gear box. Worth every penny.

Marc mentioned to me that people do a B2 and get a bunch of debris in the trans. This can lead to an early death after doing the repair.

Good luck. You seem to be having bad luck. There is another possibility...what you were told about the original running condition on the car may not be factual.

So.....in light of the costliness of downtime, it sounds like a new tranny from Sun Valley could be a great deal.....

I've been roundy round on transmissions on both cars; regular fluid and filter changes are a must. One thing for sure, transmissions are a science unto themselves, it practically requires a degree in engineering just to open one up.

I come from a family of engineers; that said, growing up we never tore down a V8 or a transmission to see what was actually going on with the internals. I've been thinking I need to take an automotive engineering class to do just that so that I better understand how these babies work.

Basic question: is this particular car set up to start in 1st or 2nd? You may have a problem with the B1 piston. You can force the car to start in 1st by applying power directly to the solenoid.

It's a 1st gear start.

Well, I guess the trans has to come out. Marc at Sun Valley said to bring it in. It may not need a rebuild, and we are hoping something simple is wrong. There was no metal in the pan when I took it off the first time, so that is a good sign. The fluid did not look or smell burnt either. I will keep everyone updated.......Rich

I took the trans out, and it was brought to Sun Valley. They took it apart, and fixed something (not sure exactly what). Supposedly they tested it and said it works fine. Today we installed the trans. After topping it off with fluid, it is doing the exact same thing. It works fine in reverse, but still no forward movement. It is getting very frustrating. A lot of labor has gone into this car with zero positive results. I am not sure what to do now. I am hesitant to work on it any more........Rich

Rich, I feel for you. Does not look like thing is going your way. The brake then the tranny. I have nothing to offer except encouragement.:eek:

Quote:

Originally Posted by ROLLGUY (Post 3724923)

And what does Sun Valley have to say about their work?

Quote:

Originally Posted by Mxfrank (Post 3724971)

And what does Sun Valley have to say about their work?

I don't know yet, I will find out today maybe.

Did they test your torque convertor as well?

Quote:

Originally Posted by dude99 (Post 3725186)

Did they test your torque convertor as well?

As stated several times, reverse works as it should. I would think that the TC is working properly.

Quote:

Originally Posted by Mxfrank (Post 3724971)

And what does Sun Valley have to say about their work?

They said to pull the valve body and bring it in. I can't see how it could be the problem. It was easy enough to take out. I hope they have some hocus-pockus magic to work on it.

Oh man. I wonder what is going on. Looking forward to hearing good news.

When I was doing some searching their seems to be an issue of 3 bolts that come loose at the pump ,you have to take the transmission down and pull the housings apart to see this ,but it is doable .If during assemble that their was no loctite used on these 3 bolts they can come loose or fallout ,these force the two plates together,trans fluid being the hydrauilic loss hear.I remember stretch had commented on this thread ,it was an older one .