ATF leak after servicing - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 2 Weeks Ago
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ATF leak after servicing

My'97 had never had a gearbox service as far as I can tell. So I had a workshop I have used for 5 years on other cars change the oil, filter and pilot bushing. Drove the 10 minutes home and found a leak under the car. Now I'm pretty sure they are not familiar with this gearbox since they didn't locate the drain in the torque convertor not did they seem to know what the pilot bushing was which is all a bit bothersome. What happens on these boxes if they are overfilled? I ask because I've been charged for 15 ltr fluid which is maybe a little over the top using a double drain,/flush.
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#2 Old 2 Weeks Ago
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Quote:
Originally Posted by Rofa View Post
My'97 had never had a gearbox service as far as I can tell. So I had a workshop I have used for 5 years on other cars change the oil, filter and pilot bushing. Drove the 10 minutes home and found a leak under the car. Now I'm pretty sure they are not familiar with this gearbox since they didn't locate the drain in the torque convertor not did they seem to know what the pilot bushing was which is all a bit bothersome. What happens on these boxes if they are overfilled? I ask because I've been charged for 15 ltr fluid which is maybe a little over the top using a double drain,/flush.
Hi,
As a guide when I did my gearbox oil and filter change I drained the torque converter and also replaced the conductor plate (losing a little more oil) to refill it was 7 ltr.

Using the flush through method, and as the torque converter had not been drained (as a guess as I have no experience of doing this) I would imagine that 15 ltr would be roughly right, especially as the ones doing it are not paying for the oil.

I would imagine that if the gearbox was so overfull you would experience gear change problems?

As for the leak, it is hard to say, but maybe the sump gasket is leaking? I would take it back for them to check.

HTH.
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#3 Old 2 Weeks Ago
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Very helpful indeed. Thank you.
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Garage
If you look at the threads for those having gear change issues,
over and under filling are amongst the first suggestions.
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#5 Old 2 Weeks Ago
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Hi,

Agreed, the Oil Leak is likely Pan Gasket or ........... Pilot Bushing Connector ............

It is very easy to make a complete FUBAR when fitting a Pilot Bushing Connector if one is un familiar with the 722.6xx Transmission.

Having read the OP I think I would get a good reputable A/T Specialist to have a look see first, after explaining to them exactly what has been done, and also that the Transmission was functioning perfectly before (if it was), and also that it has been barely driven since this attempt at repair ................. (Don't drive any more than necessary with the leak)

HTH, Cheers Dave
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#6 Old 2 Weeks Ago
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Thanks Dave. It was the bushing and they should already have fitted a new one. The boss is doing it this time. Just as a matter of interest what is the issue fitting it? Seems a straightforward job really in principle.
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Not overly tight the screw in the pilot bushing as the plastic might crack and make sure is latch in properly.
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#8 Old 2 Weeks Ago
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Hi,

/\ /\ /\ Agreed

Also .........................

The new 'O' Rings on the Pilot Bushing are often tight in the Casing bore, I always wipe a good smear of Wynns or STP on them and clean the Casing Taper thoroughly, I have seen issues where others have yanked on the tiny 7mm (head size) bolt to draw the tight assembly in, which usually results in the captive nut in the Conductor plate shearing / cracked plastic or scuffed / torn 'O' rings

The other thing I've seen over the years is that the front right pan bolt has been snapped in the Trans Casing, (happens due to corrosion), and then it is just left off by a "couldn't care less" merchant, so the Trans drips Oil from that corner of the Pan Gasket

HTH, Cheers Dave
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#9 Old 2 Weeks Ago
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Thanks all for the help. They did indeed get themselves into a real mess with the bushing. I'll get the full story and hopefully the car tomorrow.
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#10 Old 2 Weeks Ago
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Hi,

At least this proves they are a good garage and have "put their hands up" and rectified your problem in a timely manner

We all make mistakes, often on something un familiar .....................
That is not the issue, it is what we do to rectify said mistake that really counts

Hope it is all good when you get her back

Cheers Dave
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#11 Old 2 Weeks Ago
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Thanks Dave and well said indeed!
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