ATF leak
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Joined: Aug 2008
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From: Tejas
2016 C450 AMG, 2005 C230 Kompressor
ATF leak
I noticed some fluids were on the carport after driving off and I checked under the car and it has a slight leak coming from the ATF pan. I've read changing out the TCU could solve this leak but I had a few other concerns...
Before taking a long trip from Florida to Texas I wanted to check the ATF level and took off the lock (2005 C230K). I just read some threads that the ATF lock should be replaced after taking off; is that a fact? I'm not nearly as qualified as a mechanic/MB guru as you all so please bare with me. The leak just started and I jacked it up but not high enough to actually go under and inspect the TCU. I will have to use a lift since I do not own a hydraulic jack and currently using the stock jack.
Could taking the ATF lock from the engine sparked this leak? I will be running around town tomorrow in hopes of getting some auto shop advice and also some good feedback from you all. Thanks for your time!
Before taking a long trip from Florida to Texas I wanted to check the ATF level and took off the lock (2005 C230K). I just read some threads that the ATF lock should be replaced after taking off; is that a fact? I'm not nearly as qualified as a mechanic/MB guru as you all so please bare with me. The leak just started and I jacked it up but not high enough to actually go under and inspect the TCU. I will have to use a lift since I do not own a hydraulic jack and currently using the stock jack.
Could taking the ATF lock from the engine sparked this leak? I will be running around town tomorrow in hopes of getting some auto shop advice and also some good feedback from you all. Thanks for your time!
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Removing the lock from the fill tube/dipstick tube will not cause a leak. Just keep the cover on until you get a new lock pin.
The most likely cause of a leak is the electrohydrualic bush where the TCU harness plugs into the front RHS diagonal of the transmission. The TCU is inside the car under the passenger kick plate. You have to lift the carpet to access.
Other causes can be pan gasket or front or rear shaft seals but the likely cause is the electrohydraulic bush leaking.
The most likely cause of a leak is the electrohydrualic bush where the TCU harness plugs into the front RHS diagonal of the transmission. The TCU is inside the car under the passenger kick plate. You have to lift the carpet to access.
Other causes can be pan gasket or front or rear shaft seals but the likely cause is the electrohydraulic bush leaking.
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Super Member
Joined: May 2009
Posts: 904
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From: Toronto, Ontario, Canada, eh!
2003 C230 Sports Coupe, Paprika Metallic Red, Auto, Pano, Leather
That stupid plastic lock pin is one time use,... every time you check the transmission dip stick tube you'll have to break it and replace it. Just use and re-use a L-shaped (hex) allen key to lock the cap 
,.... they're commonly found at dollar store,.... a dollar for a set of allen key,... I think its size 6 that fits perfectly
,.... they're commonly found at dollar store,.... a dollar for a set of allen key,... I think its size 6 that fits perfectly
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Joined: Jan 2010
Posts: 456
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From: Canada
2003 c240 4matic wagon
My car was dripping as well i thought it was the pan seal but it was the above part
Thread Starter
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Joined: Aug 2008
Posts: 197
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From: Tejas
2016 C450 AMG, 2005 C230 Kompressor
Thanks for the feedback!
Is that electrohydrualic bush available at a local auto shop? I don't want to pay X amount more for that part at y nearest MB dealership. I have to stop by there anyway to pick up some ATF fluid to replace what has leaked out.
Andddd I also have to pick up a ATF dip stick. Thanks again!
Is that electrohydrualic bush available at a local auto shop? I don't want to pay X amount more for that part at y nearest MB dealership. I have to stop by there anyway to pick up some ATF fluid to replace what has leaked out.
Andddd I also have to pick up a ATF dip stick. Thanks again!
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Thread Starter
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Joined: Aug 2008
Posts: 197
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From: Tejas
2016 C450 AMG, 2005 C230 Kompressor
Since I was at the dealership today I picked up the pilot bushing (20$) as well as the MB ATF.
I have the instal directs from installuniversity.com I found from here but as a quick reminder, taking out the TCU harness to change out the pilot bushing will a lot of fluids come out? I'm going to be doing the work from under with a lift so it'll be easier from what I've read others do. Thanks, you've been so helpful and so prompt with responses!
I have the instal directs from installuniversity.com I found from here but as a quick reminder, taking out the TCU harness to change out the pilot bushing will a lot of fluids come out? I'm going to be doing the work from under with a lift so it'll be easier from what I've read others do. Thanks, you've been so helpful and so prompt with responses!
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