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  #71  
Old 09-24-2014, 03:19 PM
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Quote:
Originally Posted by RRPhil View Post
The breather on a 5HP24 looks like this.



The breather tube that runs up & over the valve cover is for the front differential.

Could someone explain to me how you overfill a transmission that’s fitted with a combined filler/level plug?

Phil
Since ATF expands with heat and if the ATF fluid is below the recommended temp for the check level, you can overfill the trans by adding fluid to the trans before it reaches the temp that it needs to be in order to perform a accurate check of the fluid level.
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  #72  
Old 09-24-2014, 04:42 PM
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Quote:
Originally Posted by JCL View Post
We may still be arguing semantics, but I don't think of the natural wear products within the transmission as contaminants. They are designed to be in there. The fluid doesn't get chemically changed, for example, like engine oil does. It certainly does get thicker due to clutch wear material, but fortunately the transmission adapts to that viscosity change, by design. It works fine until the filter is clogged and pressures drop. As we have seen, though, it can go hundreds of thousands of miles without that happening.

I would say the most common source of contamination is the fill plug, when owners introduce non-spec fluids.
Well I consider anything that wasn't a part of the original mixture as contaminants. If it doesn't contaminate the fluid why bother to have a filter and magnets in the trans?
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  #73  
Old 09-24-2014, 04:44 PM
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The engine would have to be running to have a chance of overfilling (because the torque converter and valve block drain down) and the transmission bulk oil temperature increases at around 5 deg.C. per minute with the engine running.



So say ambient temperature was 10 deg. C. (would anybody try checking their fluid level at a temperature below this?) and it took a minimum of one minute to carry out the check. So that’s a temperature error of 20 deg.C. The volumetric coefficient of expansion will be around 0.0007/deg.C for ATF so that represents 0.13 litres. The throat area of the sump at the filler plug (including deducting the valve block) is around 375cm2 so that represents less than 4mm in fluid level.

My point is, you’d have to try really hard to overfill a 5HP24

Phil
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  #74  
Old 09-24-2014, 05:01 PM
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Quote:
Originally Posted by upallnight View Post
Well I consider anything that wasn't a part of the original mixture as contaminants. If it doesn't contaminate the fluid why bother to have a filter and magnets in the trans?
Fair enough.

Only my opinion, but I would say to keep it out of the valve body. Not because it is changing the functional properties of the fluid in a meaningful way.
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  #75  
Old 09-25-2014, 11:20 AM
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Quote:
Originally Posted by JCL View Post
That is because it had devolved into a semantic discussion of what the word sealed means. It is vented to atmosphere, agreed. If you ford a river that is deep enough you could get water in it. I suppose. Not sure how water would be drawn in though, or if the electronics would still be functioning in water that deep.

In the thread you mention, you suggested that contaminants and so on could enter and degrade the trans fluid. You claimed the fluid became corrosive over time. That is similar in concept to engine sumps which get contaminated by by-products of combustion and fuel dilution. That ain't gonna happen. That is the reason it is referred to as sealed.

So, if you like, it is sealed from the contaminants which typically degrade other fluid compartments.
Lets look at the "semantics" of BMWs definition per their tech data.

http://www.bmwtech.ru/pdf/e46/ST034/...20Internet.pdf

Page 4 states "Transmission fluid is designated as "sealed for life".

I define that as a system that's not user friendly in regard to checking fluid level/adding fluid. BMW uses the "sealed for life" definition to explain to owners that fluid level needs to be checked in a service shop, on a lift/over oil change pit, with tools and temp sensor (and the chance for a tech to get in/under the vehicle to inspect for any needed repairs on the ENTIRE vehicle, cha-ching!).

As I stated in the other trans thread, the system would require a diaphragm seal to qualify as a "sealed system".

Even 2 one way ball check valves (one for venting positive pressure, one for equalizing negative pressure, with a filter element), would significantly reduce any chance of envornmental contaminants/moisture from entering the system.

I've seen significant dirt, dust, grime, road salts, grass/leaf/bug materals under the plastic engine covers on BMWs (where the tube vents).

Not sure of % of fluid PH change over years of driving/mileage, I'm sure it's measureable and considered "acceptable" by BMW (the same BMW that gets paid when MANY trans fail, and where I was told "lifetime" is in excess of 100k miles).
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Last edited by TiAgX5; 09-25-2014 at 11:29 AM.
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  #76  
Old 04-19-2018, 11:57 AM
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Hi all... regarding these 4.8is posts from a few years back now... my 4.8is Dec 2004 V8 (facelift) 6 speed auto has now covered 110K miles. I would like to do the transmission fluid change. Lots on that here thankfully. What fluid is best or would you just go with BMW dealer advisory? also vehicle still changes gear smooth and fine (for the main part)...... just occasionally it revs high in 1st and pretty bloomin' harsh change into second (changes late & hard) ... but only occasionally....... any ideas on this? Thanks for any advice... with thanks malc.
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  #77  
Old 04-19-2018, 12:45 PM
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1. your situation may be a PERFECT example of why dealers (and many mechanics) will say, "Dont change the fluid, we've seen a fluid change lead to issues"

You are noticing shifting issues. It MAY be too late. ATF has been ignored for 100k+ miles.....But, when issues then pop up, in a desperate attempt, owners will hussle in for an ATF service. Shops change the fluid, issues continue, dealer comes back: "Fluid change led to complaints"

You hae an E53, no? not sure what transmission you have- but I would go with the OEM fluid (not necessarily BMW branded, but whatever the origian trans mfg has specificed)

I would also NEVER get work dont on a BMW out of warranty at a mains dealer
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  #78  
Old 04-19-2018, 12:57 PM
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Quote:
Originally Posted by X5monsterBMW View Post
Hi all... regarding these 4.8is posts from a few years back now... my 4.8is Dec 2004 V8 (facelift) 6 speed auto has now covered 110K miles. I would like to do the transmission fluid change. Lots on that here thankfully. What fluid is best or would you just go with BMW dealer advisory? also vehicle still changes gear smooth and fine (for the main part)...... just occasionally it revs high in 1st and pretty bloomin' harsh change into second (changes late & hard) ... but only occasionally....... any ideas on this? Thanks for any advice... with thanks malc.
I would suggest reflashing the transmission software first. If that doesn't work, then drain and capture your existing fluid. Change the filter and clean the pan. Strain your fluid and return it to the transmission, only adding enough new fluid to bring it up to the correct level. If you still have shifting problems, the issue is more significant than fluid condition.

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  #79  
Old 04-19-2018, 04:53 PM
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Hi again... looks like my transmission is a 6HP26 .... I have not changed the ATF before as BMW (UK) said that fluid was in there for life.
I then read that 'life' according to 'experts' is between 90 & 100K miles.... so mine hit 100K 6 months ago! I have had the car since 60K miles... in the whole time I have had it on very very cold mornings the first time it shifts from 1st to 2nd it is late and harsh.... it does not do it after that...
Some peops on here have said that this seals fixes the 1st to 2nd cold start hard shift....
Will probably do the change myself... will be interested to see how hard it is to replace this seal once the bottom pan is off!
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Last edited by X5monsterBMW; 04-19-2018 at 04:59 PM.
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  #80  
Old 04-19-2018, 05:13 PM
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If you change the bridge seal, you might as well change the four jump seals as well. And the mechatronic connector seal too.

So you'll need the six seals, fluid and a filter (and maybe a pan gasket - depends on exact trans).
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