2006 leaking hydraulic fluid from trans - BMW M5 Forum and M6 Forums
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post #1 of 20 Old 10th April 2019, 05:25 AM Thread Starter
Tawitt
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2006 leaking hydraulic fluid from trans

Hello all, I have an 06 with just under 70k miles and got a transmission failure message with a red gear whenever I would come to a stop. Once driving even at 2 mph the message would go away. About 5 miles later when coming to a stop the car died and would not start again, didn’t even turn over. I towed the car home and notice hydraulic fluid on the flat bed. I removed the panel below the engine which was covered in fluid. Sprayed down the bottom side to remove any fluid and refilled the hydraulic fluid, which I’m guessing was pretty much empty by how much fluid it took. Tried to restart the car but it was the same as before. Raised the car back up and noticed the hydraulic fluid steadily dripping where the trans and engine meet. Any ideas as to what this may be? Any suggestions would be helpful.
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post #2 of 20 Old 10th April 2019, 05:49 AM Thread Starter
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I should also mention there are quite a bit of codes under the transmission. I have the following fault codes. 4FAO activation clutch 520B transverse acceleration 5201 wheel speed LR 5202 wheel speed RR 5203 wheel speed LF 5103 voltage supply, battery voltage520A steering angle sensor 5101 hydraulic press sensor
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post #3 of 20 Old 10th April 2019, 05:56 AM
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post #4 of 20 Old 10th April 2019, 06:00 AM
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Yup, I would almost bet on the slave. At 70K, I would also check your TB and guide bush as well, since you will be taking the gearbox down.

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post #5 of 20 Old 10th April 2019, 07:57 PM Thread Starter
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Thanks for the responses. I already ordered a slave cylinder and clutch kit. Anything I should be aware of while doing this? Your advice is much appreciated.
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post #6 of 20 Old 10th April 2019, 11:20 PM
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Might as well replace the guide tube too. Also make sure the trans input shaft seal isn't leaking. You'll need a special torx bit to remove the flywheel if plan on removing as part of doing the pilot bearing. If your rear plenum crankcase tubes are cracked it's a good time to replace them while the trans off. I suggest replacing the flywheel but that's just me and get new bolts for the pressure plate.

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Last edited by Ferris; 10th April 2019 at 11:21 PM.
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post #7 of 20 Old 10th April 2019, 11:37 PM Thread Starter
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I’m not seeing a guide tube as a part. Would this be a shift bushing? Pardon my stupidity, I’m new to this European thing.
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post #8 of 20 Old 10th April 2019, 11:46 PM
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Quote:
Originally Posted by Tawitt View Post
Im not seeing a guide tube as a part. Would this be a shift bushing? Pardon my stupidity, Im new to this European thing.
P/N 23117564680

You should book mark BMW Parts Catalog

Also while the trans is out, you might want to consider repairing the senor strip on top of it. Though there are tons of cautionary statements with that, but the wires have shitty insulation that crack and fray and lead to shorts.

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post #9 of 20 Old 10th April 2019, 11:49 PM
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it also doesn't hurt to replace the clutch fork , pin, and spring clip as they're cheap.


one More addendum...

You don't NEED the special alignment tool, the Luk kits come with a generic one that works, not sure about the sachs though luk uses sachs go figure. Though it makes it a little easier and you can rent one.

The goal of the special tool is to prevent the clutch from coming apart , DON'T TAKE IT APART, as it's a 4 piece clutch. The Pressure plate, internal disk and plate are pretty solidly together it's the last disk that is loose.

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Last edited by Ferris; 10th April 2019 at 11:53 PM.
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post #10 of 20 Old 10th April 2019, 11:52 PM Thread Starter
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It pulled up a release bearing guide. I attached a pic of the part number.
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