Dreaded no-reverse condition - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 02-06-2012, 11:01 PM Thread Starter
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Date registered: Apr 2006
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Dreaded no-reverse condition

I guess it was simply a matter of time....... 171K miles

I went out this morning to back the car (95 S320) onto the road but it just didn't want to move. Rev'd the engine a little but no luck. Further evaluation and consultation with Park Place Motors of Dallas indicated the reverse seals and/or piston were defective. Evidently this is a very common occurance. The transmission tech quoted me the numbers off the top of his head.

Before I drop $3K-$4K on a rebuild I wanted to check with the group to see if by chance anyone has a spare 722.508 transmission for sale, used or rebuilt. It's a long shot, I know, but hope springs eternal.

Since I have already replaced the evaporator and the head gasket, this will complete the trifecta.

1995 S320 -- built like a tank.


Unfortunately, tanks break down a lot.

Last edited by Ken_phd; 02-06-2012 at 11:04 PM.
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post #2 of 7 (permalink) Old 02-07-2012, 08:38 AM
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Vehicle: 1995 W124 E320, 1982 W123 240D, 1991 W126 560SEL, 1993 W201 190E, 1978 C107 450SLC, 1992 W140 300SD
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At $3-4K you are better off having the transmission replaced with a German factory remanufactured unit. I had a PO on my W126 do that several years ago. The receipt shows $2500 for transmission, $1000 labor. Maybe with 703.5 it's more expensive for actual parts but labor should be about the same.

You might have a condition of worn reverse clutches. I had rebuilt that part of the transmission where the car had very weak reverse. Turned out the rubber seal on the reverse piston was broken. This caused weak pressure on the clutches thus wearing them off bad.

In couple weeks I'll find out if my rebuild was successful

I have a transmission that's 703.502 taken from 93 S320. The car was wrecked from the front so I assume the tranny is good. But I have not opened it up to check the condition. I would hate to sell it and find out it's bad/weak. I was planning on testing it in my W140 at some point.

Now looking for sewing lessons
Running
1982 W123 240D "Turtle"
Projects
1995 W124 E320 "Rogue", 1991 W126 560SEL "Pegasus", 1992 W140 300SD, 1990 W201 190E 2.6, 1978 C107 450SLC, 1973 R107 450SL, 1999 W140 S500.
Gone but not forgotten:
1988 W126 560SEL - got rear ended, 1993 W124 500E - parted.
Parts:Ebay Store | In DC Area? Rent my tools, time, trailer or knowledge!
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post #3 of 7 (permalink) Old 02-07-2012, 10:33 AM Thread Starter
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Quote:
Originally Posted by russianwol View Post
At $3-4K you are better off having the transmission replaced with a German factory remanufactured unit. I had a PO on my W126 do that several years ago. The receipt shows $2500 for transmission, $1000 labor. Maybe with 703.5 it's more expensive for actual parts but labor should be about the same.

You might have a condition of worn reverse clutches. I had rebuilt that part of the transmission where the car had very weak reverse. Turned out the rubber seal on the reverse piston was broken. This caused weak pressure on the clutches thus wearing them off bad.

In couple weeks I'll find out if my rebuild was successful

I have a transmission that's 703.502 taken from 93 S320. The car was wrecked from the front so I assume the tranny is good. But I have not opened it up to check the condition. I would hate to sell it and find out it's bad/weak. I was planning on testing it in my W140 at some point.

Russianwol:

You are correct. The reverse clutch/piston/seals can be rebuilt separately. I have been quoted 9 hours labor plus the R&I.

I am curious about your 722.502 transmission from the 93 S320. I'll bet it would fit properly. I'll go to the EPC site and see if I can look at the differences. How many miles were on the .502?

BTW, there are some shops that can dyno test the transmission out of the vehicle.

1995 S320 -- built like a tank.


Unfortunately, tanks break down a lot.
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post #4 of 7 (permalink) Old 02-09-2012, 03:58 PM
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I'm going to try to find one that can dyno in my area. I've got several transmissions with "low" miles but not for W140. I'm very curious about my 220K mile transmission - I would think it was rebuilt but you never know. I might open it up though and check condition of the reverse clutches and B1 band

Now looking for sewing lessons
Running
1982 W123 240D "Turtle"
Projects
1995 W124 E320 "Rogue", 1991 W126 560SEL "Pegasus", 1992 W140 300SD, 1990 W201 190E 2.6, 1978 C107 450SLC, 1973 R107 450SL, 1999 W140 S500.
Gone but not forgotten:
1988 W126 560SEL - got rear ended, 1993 W124 500E - parted.
Parts:Ebay Store | In DC Area? Rent my tools, time, trailer or knowledge!
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post #5 of 7 (permalink) Old 03-09-2012, 03:43 PM
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Question German factory remanufactured transmission 96' E320?

Quote:
Originally Posted by russianwol View Post
At $3-4K you are better off having the transmission replaced with a German factory remanufactured unit. I had a PO on my W126 do that several years ago. The receipt shows $2500 for transmission, $1000 labor. Maybe with 703.5 it's more expensive for actual parts but labor should be about the same.

You might have a condition of worn reverse clutches. I had rebuilt that part of the transmission where the car had very weak reverse. Turned out the rubber seal on the reverse piston was broken. This caused weak pressure on the clutches thus wearing them off bad.

In couple weeks I'll find out if my rebuild was successful

I have a transmission that's 703.502 taken from 93 S320. The car was wrecked from the front so I assume the tranny is good. But I have not opened it up to check the condition. I would hate to sell it and find out it's bad/weak. I was planning on testing it in my W140 at some point.
Was that trans through the dealer? I went there today to get a replacement bulb for the instrument cluster; I got in my car, started it, put it in reverse (seemed to engage), and it failed to proceed. I was told reverse clutch probably blown, and gestimated it would probably be a minimum of $3000 to repair! And I've only owned the car for a couple of weeks....
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post #6 of 7 (permalink) Old 03-09-2012, 04:32 PM
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Question German factory remanufactured transmission 96' E320?

Quote:
Originally Posted by russianwol View Post
At $3-4K you are better off having the transmission replaced with a German factory remanufactured unit. I had a PO on my W126 do that several years ago. The receipt shows $2500 for transmission, $1000 labor. Maybe with 703.5 it's more expensive for actual parts but labor should be about the same.

You might have a condition of worn reverse clutches. I had rebuilt that part of the transmission where the car had very weak reverse. Turned out the rubber seal on the reverse piston was broken. This caused weak pressure on the clutches thus wearing them off bad.

In couple weeks I'll find out if my rebuild was successful

I have a transmission that's 703.502 taken from 93 S320. The car was wrecked from the front so I assume the tranny is good. But I have not opened it up to check the condition. I would hate to sell it and find out it's bad/weak. I was planning on testing it in my W140 at some point.
Was that trans through the dealer? I went there today to get a replacement bulb for the instrument cluster; I got in my car, started it, put it in reverse (seemed to engage), and it failed to proceed. I was told reverse clutch probably blown, and gestimated it would probably be a minimum of $3000 to repair! And I've only owned the car for a couple of weeks....
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post #7 of 7 (permalink) Old 03-09-2012, 10:18 PM
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Try Carl 140. co. uk.

He may not be perfect, but he has every part you could need for 140's
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