300TD B2 piston replaced, still no forward movement - Page 3 - PeachParts Mercedes-Benz Forum

83TD · #1 05-12-2017, 08:46 PM

You are as frustrated as I was when I finally found the valve stuck in the valve body by the piece of chrome plating that flaked off(see my previous post). Did you carefully check over the valve body and the tiny valves to make sure that debris from the failed piston did not hang one of them up? The B2 is downstream from the filter so any debris generated in that chamber can go to the valve body where operating clearances are very tight.. If the B2 chamber is not getting any pressurized fluid when in D, the piston will not move.

I admit this is a long shot, but you seem to have covered the more likely scenarios, just as I had.

Peter

Mxfrank · #2 05-13-2017, 02:39 PM

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.

DeliveryValve · #3 05-13-2017, 02:42 PM

It's a 1st gear start.

ROLLGUY · #4 05-16-2017, 10:33 AM

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

ROLLGUY · #5 06-29-2017, 12:36 AM

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

Mxfrank · #6 06-29-2017, 08:20 AM

Quote:

Originally Posted by ROLLGUY

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.

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

ROLLGUY · #7 06-29-2017, 11:23 AM

Quote:

Originally Posted by Mxfrank

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

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

ROLLGUY · #8 06-30-2017, 01:04 AM

Quote:

Originally Posted by Mxfrank

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.

ah-kay · #9 06-29-2017, 02:20 AM

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.

dude99 · #10 06-29-2017, 07:42 PM

Did they test your torque convertor as well?

ROLLGUY · #11 06-30-2017, 01:01 AM

Quote:

Originally Posted by dude99

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.

ykobayashi · #12 06-30-2017, 01:16 AM

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

chasinthesun · #13 12-07-2017, 11:22 AM

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 .

chasinthesun · #14 12-07-2017, 12:05 PM

HERE IT IS Torque Converter or Transmission Problem- 82 300D

ROLLGUY · #15 12-18-2017, 01:29 PM

I looked back and found that I didn't post the final outcome. It was in fact a bad valve body. I pulled it and sent it to Marc, and he provided a rebuilt one. I put it in and the trans goes into gear, and shifts perfectly. Yes this was over 5 months ago, and I am sorry for letting everyone hang for that long.....Rich