Did the Transmission quit on me? SA, Tx - PeachParts Mercedes-Benz Forum

tbomachines · #1 06-20-2012, 04:14 PM

Does reverse work?

81-300d · #2 06-20-2012, 04:21 PM

Quote:

Originally Posted by tbomachines

Does reverse work?

Not at all, certainly would have helped with towing it.

tbomachines · #3 06-20-2012, 04:25 PM

Quote:

Originally Posted by 81-300d

Not at all, certainly would have helped with towing it.

Well that stinks, rules out the infamous B2 piston. Did it die in a pool of tranny fluid or is it all still together? Reason I ask is because the symptoms you describe would fit having little or no trans fluid so it could have a pump failure perhaps, or if there was a huge puddle perhaps just a line popped off. If you have time, this sounds like a good opportunity to tear it all apart and find something broken inside.

junqueyardjim · #4 06-20-2012, 04:26 PM

There are parts of that transmission which can be repaired or replaced with out removing the trans. But if you could screw up the courage and energy to R & R it, you are still an awfully long way from being ready to over haul it. You wouldn't know where to start. I would think if you can R & R it, I would look hard to find one for sale that at least has a replacement guarantee. I think that is your best bet, and if you havn't pulled one yet, you are looking forward to a good education,

81-300d · #5 06-20-2012, 04:48 PM

Quote:

Originally Posted by junqueyardjim

... But if you could screw up the courage and energy to R & R it, you are still an awfully long way from being ready to over haul it. You wouldn't know where to start... ,

lol
no doubt.

The R&R looks pretty straight forward...but I'll hand it over to a pro for the rebuild

junqueyardjim · #6 06-20-2012, 06:25 PM

One place where we fail to inspect and you did also. If there is fluid in the transmission, then with the engine running you can tell if the oil pump is working by undoing either trans cooling line at the radiator. That is useful information in that it is not real difficult to replace the pump in the transmission.

81-300d · #7 06-20-2012, 07:34 PM

I've been wondering if it might be the pump. Didn't think of a way to chk it, which seems obvious now.

Thanks.

If its like an engine oil pump, seems unlikly that it would be the problem tho.
but its an easy chk

What do you think about changing the filter too? If the transmission has something broken in it I don't want to buy a filter only to check the pump, then have to change it again.

I would have been getting some shifting problems if it was the filter...right???

junqueyardjim · #8 06-21-2012, 02:29 PM

Well what I am talking about is the transmission oil pump. As soon as the car engine is running, and even with your shift selector in neutral, the TC is running because that is tied to the flywheel, but the mainshaft enters into the transmission body and the first thing it runs through is the oil pump. This pump pressurizes the TC, also all the valve bodies in the transmission. So number one is the oil pump. If that has failed your vehicle will not move. An instaneous failure almost certainly has to be an hydraulic pressure failure, eith the pump is not pumping or in some other part of the transmission, a gaskey failed or a casting broke and it doesn't have any pressure. Now if you have your old filter you could re-use it for a test - but make sure it is not contaminated with debris. Then dump in 6 of 7 quarts of oil if you wish to make the test, (transmission oil of course). Sometimes the shift selector can come off, sometimes it breaks off inside the transmission. These cars are getting quite old, anything can happen.