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  #21  
Old 02-13-2020, 03:41 PM
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Thank you for the links to the videos. Very helpful smassey321.
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  #22  
Old 02-13-2020, 03:49 PM
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Quote:
Originally Posted by Mdickey View Post
Thank you for the links to the videos. Very helpful smassey321.
You are welcome. Here is a good DIY for the 8 speed fluid/filter change.

https://blog.fcpeuro.com/how-to-serv...p-transmission
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  #23  
Old 02-13-2020, 03:53 PM
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Procedure

You need to have the engine running when you are adjusting the fluid level. If you don't have the engine running, your fill will be several quarts low. I know this from experience. I assume the fill procedure is the same for the 8 speed. I have the 6 speed. You can double check using Google

Eight speed guys, please correct me if wrong. I don't see why the fill procedure would be different- but could be wrong.

Did you have a recent transmission service or did somebody adjust the fluid for you before this happened? If the fluid is low and you went into limp mode that one time (or a handful) you might be ok. Even if the lubrication circuit loses flow intermittently there will still be an ATF film for a bit. Was the transmission acting funny before limp mode? If the mechatronic unit loses pressure of a couple seconds the transmission will change ratios randomly (act weird). It may act up a couple times before the computer catches it and goes into limp mode.

If not fluid level, I agree it could be something in the mechatronic unit. The solenoids would be the next thing to look at. Too bad you don't have ISTA+. It would give you a bunch of information about the mechatronic unit solenoids, adaptions, etc, but there is a learning curve to get it installed and usable. Maybe somebody on a forum near you could help you with it.

With the 6 speed, when the engine is running, fluid is being pumped through the system and the fluid level in the sump drops a bit so you need to have the engine running to fill the sump so the fill plug has drips or a slow stream at around 35C to 40C. Over 40C is too much. Shoot for 35C. The BMW procedures say between 30F and 40F, some people say 40F. I split the difference at 35C, which will wind up being a little more fluid than at 40C. The fluid expands as it heats and takes up more volume. Sorry if you know this; just trying to be complete.
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  #24  
Old 02-14-2020, 02:41 AM
ard ard is offline
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some fun reading...



https://www.newtis.info/tisv2/a/en/e...t-8hp/C2JNfr4s
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  #25  
Old 02-14-2020, 03:29 PM
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Did a quick read through. Was interested to read that the same gearbox is used by Rolls Royce. Also, the bit at the end related to lifetime fluid kills me. Ugh.
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  #26  
Old 02-14-2020, 10:27 PM
ard ard is offline
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ZF makes A LOT of trannies. The ZF6 in my E70 uses "Oil change kit for BMW-Hyundai-Jaguar-Land Rover-Rolls Royce"


for example







Out of curiosity... was the ATF ever serviced??

Last edited by ard; 02-15-2020 at 02:47 AM.
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