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#1
12-24-2010, 02:40 PM
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W126 Broken drive ear, what to replace?
I recently put my car ('87 300sdl) into drive after driving it around and... nothing. Not a peep. I tried every other gear and nothing at all. Checked the linkage and everything is good. Disconnected a trans cooler line and the front pump is still pumping.
So my question is this; assuming that I misassembled the torque converter and broke the drive ear inside the transmission, what part am I looking for and how far apart will I need to take the trans to get to it? Just remove the front pump or is there more to it? Or is it more likely that I broke the drive ear on the TC? Thanks!
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1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl? 
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#2
12-24-2010, 03:25 PM
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you'll have to pull it apart to know for sure, but I've seen tc,front pump and imput shaft damaged this way. if the trans is bolted in with the tc out of the pump, it puts a lot of pressure on things, and the damage is significant.
I've never seen it in a MB trans though. just th400's and 700R4's...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
12-24-2010, 03:28 PM
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I bet it was just the front pump.
I'm gonna pull it, I can't stand waiting until spring. I'll just have to freeze my ass off. Anyone have a front pump for sale? Would I need the entire pump? Seems like I wouldn't.
__________________
1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl?
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#4
12-24-2010, 03:34 PM
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there is a transmission at the charlotte pnp that someone took the tc, and the b2 pistons from... I could go get it for you after Christmas if you can't find one.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#5
12-24-2010, 03:47 PM
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Well that's awfully kind of you, I'll check around here first and see what turns up. Unfortunately I live in an area with very few MB parts so I've been ordering everything online since I moved here.
__________________
1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl?
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#6
12-24-2010, 03:56 PM
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If the front pump is still pumping, isn't this an indication that the connection between the pump and TC is intact?
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#7
12-24-2010, 04:10 PM
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Good question.
Doesn't the front pump get it's power from the TC input? I'm also not sure about the flow rate, it seemed somewhat weak. Should it be pumping 2 quarts per minute or so? Does it always get pumped to the cooler? Would the fact that it's in the teens temperature wise change anything? Bottom line is that I need to get it apart.
__________________
1987 300SDL 167k 1992 Volvo 740 140k 1990 Volvo 740 250k 1989 Volvo 240 269k Anyone want to trade an old Volvo for an '87 300sdl?
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#8
12-24-2010, 04:15 PM
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Sorry, can't help on the flow rates and I know little about transmissions. I do know that the standard diagnostic procedure recommended on here to test the connection between the TC and the transmission/pump is whether fluid is flowing to the cooler.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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