I built my 722.120 back in 2005 and it has been leak-free until recently. I have been noticing fluid leaking out from under the neutral switch and initially, suspected the selector shaft seal.

When I removed the switch and cleaned the area, there was no leak, even after running the car for 30 minutes on the hoist.

Then, I pulled it into drive.....

Fluid poured from a shaft located in a recessed hole just in front of the selector shaft seal, as shown in this photo:



It appears that this shaft, which does not move in or out when the transmission is shifted from drive to reverse, is sealed with an 'O' ring that requires disassembly to replace.

Pulling the transmission into drive or reverse causes the shaft to shift upward/downward in the case and allows fluid to leak past it.

I know I replaced all the seals when I rebuilt the unit, but I do not recall just how this shaft is sealed. However, I did not want to pull the unit down to change the 'O' ring.

My solution was to drive a common 20mm soft plug flush into the hole after cleaning the area and coating the plug with red Loc-Tite.



The cross member needs to be removed to allow the tail of the transmission to hang down in order to drive the plug, but it only took 15 minutes start to finish on the hoist with a tranny jack. On your back in the driveway will make it tough!!!!

So far, over 500 leak free miles.

Hope this helps...Robert

P.S. We recently moved to So Cal and have limited Internet access, so my replies will be delayed.

Happy Thanksgiving!!!!!

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

That solution deserves a 'Cuban Mechanic of the Year' award.

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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

Lots and lots of miles and very minimal service because it is serving as a dialy driver for me wife.

I also serviced it at the same time....after 56,000 miles with Type F fluid (what I prefer on 722.120's personally) and there was nothing at all in the pan or filter, and the fluid still smelled new.

I let it down off the rack and put 275 freeway miles on it straightaway...Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Still bone dry with nearly 1,000 miles since the plug was installed...Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Why do you run Type-F fluid......thats meant for old Ford trannies needing a high friction fluid.....

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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)

I always felt the shift quality was firmer with the higher frictional coefficient fluids. After running Dad's old 722.120 almost 220,000 miles on Type F and finding the clutches and bands still serviceable, I kept on uisng it.

I'm just an odd duck I suppose, but I can detect all the subtle differences from these small changes and like the way it works...Robert

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Talked to 3 people this week with the same 'mystery' leak on a 7.22.120 transmission!!!!!

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

is red loctite wise? I'd think a simple anerobic gasket material would be a better choice... for future service...

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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 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Agreed, but Red Loctite was all I had on hand at the time....

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Bonjour
Merçi a tous pour mon probleme.
J'ai fais la vidange est le filtre ,120000Km .J'avais des accoups dans le dos ,ou coups de pieds au cul en français.
C'est quand j'ai retirer le carter que j'ai trouvé les deux pieces.voir photo plus haut.
J'aimis un filtre neuf est fait le niveau d'huile a froid puis a chaud,frein de parking seré en P et huile a 80°.
niveau huile a froid 8 cm au dessus du max et a chaud OK entre le mini est maxi.
Toujour coups de pieds au cul,je n'ai pas remplacer les pieces HS .
Avez vous une documentation transmission 722 112 pour le demontage et remontage merçi

Bonjour,

je ne reconnais pas la partie que vous avez trouvée dans la casserole de pétrole. Je n'aurais pas peur. Je ne crois pas qu'ils soient un problème. Je n'ai jamais vu une telle partie dans des 722.

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Do you think that the plug will pop out when sufficient fluid builds up behind it? My 95 has a mystery leak too.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

Doktor Bert,

How in the world did you learn French?

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

According to his day in the life thread he's speaking Romanian, Spanish and German too

http://www.peachparts.com/shopforum/diesel-discussion/327659-day-life.html

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!