Hi
Anyone here ever overhaul the transmission, special tools needed? best place to buy the Kit? any advice?. Nothing big wrong with mine, leaks pretty bad thats all, but i would like to do the work myself and not put in a rebuilt one, Part of the reason i bought the car was to work on it and i have a another car so the Mercedes can be down as long as i like.
Thanks

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1979 300D.

Why rebuild then? Why not just replace seals? My motto.....If it ain't broke, don't fix it

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

Mine leaked pretty bad when I got it, we had the seals redone, and its been fine for 39,000 miles since then...

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

My motto is if it ain't broken it will be soon.
Ps i got the map pocket that you sent thanks again.

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1979 300D.

Which transmission series do you have? 722.3 or 722.1 for starters. These are slightly different beasts.

No special tools are needed except for maybe one(contrary to the manual) but I would HIGHLY recommend a transmission holding fixture. The B1 piston can be remove with an 18" clamp as opposed to the tool in the rebuild manual. If you are doing a full rebuild meaning you are also replacing the pressure springs then you will need the compressor tools.. You may be able to improvise with clamps, but it's a PITA and I'm not sure it's possible with the K1 and K2 clutch packs...it is with the b3 springs.

I lip seal remover/installer is very useful too, but only about $5 at your local auto parts store (looks like a dentists tool).

Then you'll need a micrometer to measure clearances. The clearances are VERY tight and require playing with shim sizes and outer discs on the clutch packs to get it all right. The problem here is you won't know which one's you need until your piecing it back together. Buying every combination is not cost effective as the discs are expensive.

This is all based on the 722.3. The 722.1 may or may not be a bit simpler though I know it has adjustable brake bands so this may get tricky too.

This is no small job. It is perhaps the mother of all of them and only rivals rebuilding the bottom end of the motor..might be worse.

As for valve body, I think the general consensus on this forum is get someone else who knows what their doing to do it for you. As another member pointed out, the valve body is more complicated than the entire interior of the transmission

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)

Its a 722.118 tranny, my biggest problem is lack of info such as a manual,
i bought the ATSG, but thats hard to get the info from.
Thanks

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1979 300D.

Yeah the photos in the ATSG manual suck, plain and simple. I ended up using another manual (link escapes me but it's based on a '96 C220) and the ATSG when I needed a second opinion.

I can say this. If you follow the manual (ATSG or other), things will become clear as you disassemble the unit. It's far from obvious if you've never opened the box before. At least it wasn't for me.

Removal and installation of the transmission is a 2 day job if it's your first time. Installation of seals is quick and included in that estimate.

One manual estimates 11 hours for a complete teardown and rebuild. That's 2 days too, for a professional. I would at least double it for a first time. Your car could be out of commission for some time. If this is not a problem, keep plugging away. I think MB may have a service manual.

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1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)

Anybody know if MB has a Manual for transmissions?
Thanks

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1979 300D.

i would be surprised if they don't. of course the challenge is to get your paws on one...

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Aquilae non capunt muscas! (Eagles don't hunt flies!)


1979 300SD Black/Black MBtex239000mi
1983 300TD euro-NA. White/Olive Cloth-MBtex 201000mi. Fleet car of the USA embassy in Morocco
1983 240D Labrador Blue/Blue MBtex 161000mi

I think its a bit nuts to rebuild a transmission that works. Just reseal it and drive. I have done maybe 10 or so domestic automatic rebuilds. They were no more difficult than assembling an engine. The main problem as noted is having the correct tools and an assortment of parts. I was lucky and had access to this stuff at the time. If you are truly able to live without the car for a long period of time and want to learn how autos work, feel like buying some special tools and run around sourcing parts then go for it. It will be an experience. RT

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When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

ATSG is it. none for manual trannys that I have seen.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

A paper manual does exist for automatic and manual transmissions up to the late 70's. It is not very detailed. You could probably take a manual transmission apart and put it back together with this book, but I wouldn't attempt it on an automatic.

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Palangi

2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg



TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
0BAMA .......... OUTHOUSE

any place where I can get a valve body? I replaced my bowden cable and my tranny is still in 4th gear before i hit 20, I figure its the valve body, but it may be the modulator. I have no clue.

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1983 300DT 284k miles. :-) "The Benzo"
1998 Mustang GT Custom 4.9 L engine.
1997 Dodge ram Pickup 5.9L

If it's your labor and not shop labor, I would reseal the trans and replace the trans mount and flex disc at the same time. The aftermarket parts on the market today are not as good as the oem parts MB used, and if it shifts fine you are better off simple fixing just the leaks.

Btw, make sure the metal cooler lines aren't the cause of the leak. They tend to leak because of pinholes caused by the vibrations, and loose banjo fitttings at the trans.