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  #1  
Old 04-01-2015, 10:02 AM
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Automatic transmission filter and fluid change

I tried searching but I can't find the specifics regarding the procedure to change ATF fluid and filter on 2005 x5 4.4I with 6HP26 trans.
The only one I found is this:
http://www.xoutpost.com/bmw-sav-foru...hange-diy.html

And it's not the same trans and doesn't show the filter change.

Can someone guide me to where I can locate a DIY for this? I already bought the kit with gasket, filter and ZF lifeguard 6 trans fluid. I want to know what is the torque spec for drain, fill plug and also the pan mounting bolt.

Thanks!
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  #2  
Old 04-01-2015, 11:13 AM
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I just did mine, and the 1st thing you need to do is look at your fill plug. Mine was capped off and I had to use a dremil and pic to remove the plastic so I could remove the fill plug, ( BMW don't want you changing it) After that I drained the oldfluid in a clean new container. Then removed the Trans pan. Cleaned it all up, swapped out the filter and put the pan back on. The only thing I did was replace 2 old quarts of fluid with 2 new ones and used the rest of the old Trans fluid. I didnt want to clean out the Trans to quickly. This way the 2 new Quarts will slowly clean the trans and maybe late this fall I will drain and re-fill with 4 new quarts. I have to say after swapping 2 new quarts in the 2 to 1 downshifts are not a noticeable. I don't know what the Tq specs were. I guessed. ( yes I know I'm going to he## and my trans is going to fall out without proper tq procedure). Oh, with 120K miles my trans fluid didn't look as bad as I expected. It was slick like motor oil and didn't smell to bad.
If you can pull the drain plug at night and let it drain all night you will appreciate that the next morning when trans fluid isn't dripping all over.

Good luck.
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  #3  
Old 04-01-2015, 11:15 AM
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BTW, Mine is a 2005 4.4i with 6hp26 trans to.
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Old 04-01-2015, 11:19 AM
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Thanks for the overnight draining tip and also the cap on the fill plug. I'm going to check that before I start this thing. Was the filter held by screws?


Quote:
Originally Posted by Slow&Steady View Post
I just did mine, and the 1st thing you need to do is look at your fill plug. Mine was capped off and I had to use a dremil and pic to remove the plastic so I could remove the fill plug, ( BMW don't want you changing it) After that I drained the oldfluid in a clean new container. Then removed the Trans pan. Cleaned it all up, swapped out the filter and put the pan back on. The only thing I did was replace 2 old quarts of fluid with 2 new ones and used the rest of the old Trans fluid. I didnt want to clean out the Trans to quickly. This way the 2 new Quarts will slowly clean the trans and maybe late this fall I will drain and re-fill with 4 new quarts. I have to say after swapping 2 new quarts in the 2 to 1 downshifts are not a noticeable. I don't know what the Tq specs were. I guessed. ( yes I know I'm going to he## and my trans is going to fall out without proper tq procedure). Oh, with 120K miles my trans fluid didn't look as bad as I expected. It was slick like motor oil and didn't smell to bad.
If you can pull the drain plug at night and let it drain all night you will appreciate that the next morning when trans fluid isn't dripping all over.

Good luck.
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  #5  
Old 04-01-2015, 11:26 AM
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The filler plug uses a large allen wrench. In the DIY thats posted is almost identical so you can follow 90% of that. The filler plug should always be removed or loosen 1st to make sure you can re-fill it once you drain it. The filler plug itself is a internal allen and they fill that with plastic so you cant use your allen on it. You have to remove the plastic to be able to use the allen wrench on it. I hope that helps. I should have take in pic lastnight. These isn't a lot of room because the exhaust is right there.
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  #6  
Old 04-01-2015, 02:16 PM
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Based on the information in your post, you filled transmission using the wrong fill plug! On our 6HP-26 you must use plug "C" on the attached image to fill transmission and plug "D" to drain. If you used plug "B" to fill - you are about one quart overfilled.
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Old 04-01-2015, 02:35 PM
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Filler plug is 17mm hex nut and is torqued quite high from memory (FT). I assume you have the steel pan? Depending on the gasket you have, the torque settings for the pan bolts may vary. If you have a rubber gasket they'll be around 7 newton metres. If paper, then around 9. Go to the ZF website for details on the process. New filter simply pushes in place. Make sure the O-ring comes out when you remove the old filter.
I tried to attach the PDF I downloaded from the ZF site but it exceeded forum limits. Simply Google "ZF six speed transmission service procedure" and you should get the result (look for ZF site PDF). There's an extensive document providing info about all sorts of set-ups from Jaguar, Bentley to Audi and BMW with particulars depending on whether you have the plastic or steel pan. Easy to follow info and torque settings. There's also a YouTube video (2 parts) about the process being done on a Mini or BMW car, which gives you an overview. Important things to remember are temps when topping up fluid and ensure you go through all gears to circulate fluid. You MUST top up to correct level while car is running and use lint free cloth to clean pan & magnets. These transmissions are quite sensitive so don't leave lint or any alien bits behind. Take care of the exhaust system (don't burn yourself) and as others have said, drain and top up the system again in a while, so you slowly replace as much of the old fluid as you can (about 4 litres remains in the torque converter). Took me about 3 hours all-up, but I did mine on my garage floor with car up on axle stands (a bit squeezy).
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Old 04-01-2015, 02:45 PM
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Look on page #5 for the specific instructions for our 6HP-26x.

http://www.zf.com/na/content/media/u...Procedures.pdf
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2005 X5 4.4 Her's (Retrofitted Servotronic Steering Rack)
2003 X5 3.0 Mine (Retrofitted Servotronic Steering Rack and Heated Steering Wheel)
2001 M5 Son's car
2000 540i 6sp Sports pkg, supercharged. Son's car (Sold)
2001 530i (Sold)
1999 528i (Sold)
1975 2002 (Sold)
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  #9  
Old 04-01-2015, 03:29 PM
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Well I used B plug to fill mine up. I drained out a little over 4 quarts using a container with fluid measurements on it. I poured out 2 quarts of old fluid and replaced with 2 new quarts and pumped it all back in while the X was running in park. With all the fluid back in that came out, it dribbled out of the B hole. After a test drive and back on the rack again, i pulled out B plug and got a few drops out. So If I took out 4 quarts and put back in 4 quarts I don't think its over filled. Like I said my transmission will probably fall out now.

NOTE: This is how I did mine. You should do yours however you want. That Large C plug is hooked to a large plastic piece inside the pan. That should be a lot of fun filling that back up. My hypothesis is BMW does not want anyone to change the fluid, so they made it more complicated. BTW the trans has a sticker on it that says lifetime fluid, do not change or something like that and then a part # for fluid to use.

So Terry, I apologize for giving bad advise. Clearly I'm ignorant. Still good luck with your project.
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Old 04-01-2015, 10:37 PM
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Slow&Steady, Thank you again for sharing the tips. There is no need to apologize, you did nothing wrong. I would have done the same thing. I still find it hard hard to believe that both the drain and fill plug is on the bottom of the pan.I guess I will find out when I do this. This is a first for me. I'm used to hondas where everything is easy. Thank you for the PDF file, I feel more confident tackling this job.
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