Transmission K1 Piston Spring Repair - Page 5 - Mercedes-Benz Forum
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#41 (permalink) Old 11-18-2010, 08:50 AM
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Bowden Cable with ATF leak on 722.3 transmission

Hi guys

Just detected a dripping leak at the plug where the cable is attached to the transmission. It is a new part bought during the rebuilt 2 months ago. Indy tried to put sealant to stop the leak but after driving from work then home only i detected the leak started again. Check the ATF level and it seems overfilled.

Car going back in to the workshop first thing tomorrow morning. Wondering is there a seal or install method required when installing the bowden cable plug?
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#42 (permalink) Old 11-19-2010, 08:51 AM
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I believe you need this o-ring. I just ordered new bowden cable and o-ring and plan on doing this after I get my new, hopefully working, modulator installed. I have 722.303 tranny

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#43 (permalink) Old 11-20-2010, 04:48 AM
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Quote:
Originally Posted by driftmeister View Post

After putting the ATF 6 litres, which my parts guy told me to buy 6+1 (standby) so i didn't expect it to be slightly overfilled now. Have to re-check again and should i remove some of it? Will the transmission get damaged for overfill?

Detected a leak from the kickdown plug hole at the transmission, not sure why the seal gave way probably due to the new buildup pressure from the K1 spring kit.
Overfilling will most likely not cause immediate, catastrophic damage, but it can lead to the ATF foaming which in turn can cause slippage. I would try to get the level right; especially if you are tinkering with the adjustments to tune the shifting.

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#44 (permalink) Old 11-20-2010, 11:45 AM
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Thanks guys...sorted out by removing the 1 quart of excess ATF. Probably it was my mistake because i read somewhere that we need 6 quarts for every change of ATF service. Anyway will check whether my O-Ring need to be change, since my rebuilt the bowden cable is new but hope my Indy change the O-ring at the same time.

Update on the K1, reduce flare with upshift of 3000rpm for 2-3. I am happy now since it will upshift when cold start in the morning. Previously it would be like free gear and upshift at 4500-5000rpm. My transmission is a 722.319, after adjusting my bowden cable without any slack...is there any way of reducing the 2-3 upshift at 2500rpm or less?
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#45 (permalink) Old 12-09-2010, 05:33 AM
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Quote:
Originally Posted by tjyak50 View Post
I bought a spare K1 kit from Mercedes of Avondale (Phoenix).
If anybody needs one it is surplus to my needs.

Tj
do you still have the kit

126 270 44 77

I need to do this service on my 95 e320. Flare at 2-3

1989 300CE 132k miles
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#46 (permalink) Old 01-11-2011, 07:58 AM
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I've decided that I don't like the Mercedes supplied K1 spring.
My flare is long gone, but the 2-3 shift is very soft and lady-like.
Adjusted the modulator to no effect.

Subsequently I removed the K2 spring to amend the 3-4 shift but put it all back without replacing anything. After that the 3-4 shift became more firm.

So I am left with a soft 2-3 shift and a firm 3-4 shift that I cannot adjust away with Modulator adjustments.

Thinking about ordering those aftermarket springs and trying those. Maybe find some new pistons too and replace those.

Any input is appreciated.

TJ

Tom Johnson, Phoenix, Az
1988 560SEC
1993 190E-2.6
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#47 (permalink) Old 01-12-2011, 09:32 PM
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On advice from my Indy Mechanic in Phoenix: David Terry,... I reduced the Modulator pressure a bit and put a teence more preload on the kickdown cable.

That helped delay and soften the harsh 3-4 shift and seemed to make the 2-3 shift more positive.

Will drive for a while and see how it goes.
Normally I only drive the SEC on weekends but its been my daily for the last week while my normal driver (Nissan Frontier) is being used as an aircraft tug...

Tj

Tom Johnson, Phoenix, Az
1988 560SEC
1993 190E-2.6
1973 240Z (Track only)
1970 240Z (Shell)
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#48 (permalink) Old 02-20-2011, 09:12 PM
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Shift correction package 722.3 / 722.4 Gas Makco Transmission Parts

Seems to have a shift correction kit with various springs.
Could this be a solution to the 1-2 and 3-4 bad shifts/flare

1995 S600 Coupe
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#49 (permalink) Old 02-21-2011, 06:59 AM
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Looks like you have to keep recycling your ATF fluid each you the spring is changed....should be worth it if the flare is cured...
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#50 (permalink) Old 02-21-2011, 07:18 AM
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This saved my transmission 7 months ago and it's still shifting good. I think anyone with shifting issues should do it first. (Along with a filter/fluid change)

$8 part saved me from a rebuild.


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Last edited by scottx; 02-21-2011 at 07:22 AM.
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