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#1
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BMW Clutch Issue
1986 BMW 535i. I bought it a few years ago with a bad transmission and only
120k miles, and a friend of mine dropped an '83 junkyard transmission into it and a new clutch. It's been running well, and I have slowly been cleaning various things on it up. Starting around 220,000 miles, the clutch began sticking closed. That is, I'd put my foot down, the pedal would stick to the ground, and the clutch would remain engaged. I could pull the pedal up and pump it down a couple times and the clutch would open properly again. It started happening now and then, and then more and more often. I replaced the plunger on the clutch master cylinder, which was leaking, on the suspicion the seal in it was bad. Didn't fix anything. Took it to a respected BMW indy mechanic around here, who swore I did it wrong and replaced the plunger again. Didn't fix anything. Replaced the whole master cylinder. Didn't do anything. Changed the fluid and replaced the slave cylinder. Still no go. Now, I am assuming that there is no possibility of the line between the two cylinders being an issue, and no backflow valve anywhere in the system. Is this correct? Recently it got worse, and I took it in to him again. At this point, we figure it has to be something inside the transmission. He drops it, and replaces everything that looks even a bit suspicious, namely the throwout bearing release lever, the lever pin, the clutch release bearing, and the shift bushings. Everything else looks clean, though neither one of us could see how any one of these would cause the problem. Putting the thing back together, the problem is now actually worse, since the friction point is closer to the floor than it was before. The car is now doing it almost all the time, making it impossible to drive except on the highway. Help! Anybody have any suggestions about what could be causing this issue? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#2
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BMW Clutch Issue
Scott Dorsey wrote:
> 1986 BMW 535i. I bought it a few years ago with a bad transmission and only > 120k miles, and a friend of mine dropped an '83 junkyard transmission into it > and a new clutch. It's been running well, and I have slowly been cleaning > various things on it up. > > Starting around 220,000 miles, the clutch began sticking closed. That is, > I'd put my foot down, the pedal would stick to the ground, and the clutch > would remain engaged. I could pull the pedal up and pump it down a couple > times and the clutch would open properly again. It started happening now > and then, and then more and more often. > > I replaced the plunger on the clutch master cylinder, which was leaking, > on the suspicion the seal in it was bad. Didn't fix anything. Took it > to a respected BMW indy mechanic around here, who swore I did it wrong and > replaced the plunger again. Didn't fix anything. Replaced the whole master > cylinder. Didn't do anything. Changed the fluid and replaced the slave > cylinder. Still no go. > > Now, I am assuming that there is no possibility of the line between the > two cylinders being an issue, and no backflow valve anywhere in the system. > Is this correct? > > Recently it got worse, and I took it in to him again. At this point, we > figure it has to be something inside the transmission. He drops it, and > replaces everything that looks even a bit suspicious, namely the throwout > bearing release lever, the lever pin, the clutch release bearing, and > the shift bushings. Everything else looks clean, though neither one of us > could see how any one of these would cause the problem. > > Putting the thing back together, the problem is now actually worse, since > the friction point is closer to the floor than it was before. The car is > now doing it almost all the time, making it impossible to drive except on > the highway. > > Help! Anybody have any suggestions about what could be causing this issue? > --scott slave? nate -- replace "roosters" with "cox" to reply. http://members.cox.net/njnagel |
#3
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BMW Clutch Issue
"Scott Dorsey" > wrote in message: ><skip> > Putting the thing back together, the problem is now actually worse, since > the friction point is closer to the floor than it was before. The car is > now doing it almost all the time, making it impossible to drive except on > the highway. > > Help! Anybody have any suggestions about what could be causing this issue? > --scott > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." Gift (Answer) from JoshIII: I have a friend that had exact same problem, on about the same year and model as yours, i.e. mid 80's 5-series with manual transmission. We replaced the clutch master cylinder and slave cylinder, but problem was still apparent. I determined the problem was in the clutch pedal itself, and not with the pressure plate or throw out bearing sticking on the transmission input shaft. You can make this determination just by loosening the two nuts holding the slave cylinder to the transmission and pressing the clutch all the way down to see if it sticks to floor again. If pedal still sticks to the floor, *AND* the slave cylinder is still under load with tension from the clutch pressure plate springs, then you know your problem is with the clutch pedal itself and not the transmission. Next, I got on my back underneath his steering column to see how the clutch pedal linkage works. If you notice there is a spring loaded hinged linkage that connects between the clutch pedal and the firewall (doing this from memory). Seems like I remember the clutch master cylinder plunger connects directly to the clutch pedal. Anyway, this linkage should have a little coil spring on it that compresses when you press your clutch pedal. If you notice the little coil spring also has an adjustment nut and a lock nut on it. Loosen these two nuts as far out as you can, and still are able to make the lock nut lock on the threads. The way the clutch pedal linkage is designed, the linkage rotates past top dead center when the clutch pedal is fully pressed down, and will not allow pedal to come back up. There should be an adjustment to the linkage itself, but there is not. The only other simple alternative is to loosen the coil spring tension nuts as described above. This *should* resolve your problem. It did on my friend's mid 80's 5-series BMW. Please post result in this newsgroup. Hope this helps resolve your problem! JoshIII upstate south carolina josh3i at hotmail . com |
#4
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BMW Clutch Issue
Nate Nagel > wrote:
>> >> Help! Anybody have any suggestions about what could be causing this issue? > >slave? Replaced it, also (and I forgot to mention it) replaced the pedal assembly. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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BMW Clutch Issue
Scott Dorsey wrote: > > Starting around 220,000 miles, the clutch began sticking closed. That is, > I'd put my foot down, the pedal would stick to the ground, and the clutch > would remain engaged. Can't tell what "clutch remains engaged" means? Does that mean the transmission is engaged or does it mean the opposite? If it means the former it is pretty evident that the hydraulics have failed. If it means the latter then there is no clear indication of a problem with the hydraulics and the mechanical linkage would likely be the problem. > I could pull the pedal up and pump it down a couple > times and the clutch would open properly again. What does "clutch would open properly" mean. If you don't do the pumping thing then the transmission will remain engaged? or remain disengaged? or what? >It started happening now > and then, and then more and more often. > Has your mechanic actually been able to reproduce the problem or is he going only by your description of the problem? If he has seen the car when the problem exists I would take it to another mechanic. -jim > I replaced the plunger on the clutch master cylinder, which was leaking, > on the suspicion the seal in it was bad. Didn't fix anything. Took it > to a respected BMW indy mechanic around here, who swore I did it wrong and > replaced the plunger again. Didn't fix anything. Replaced the whole master > cylinder. Didn't do anything. Changed the fluid and replaced the slave > cylinder. Still no go. > > Now, I am assuming that there is no possibility of the line between the > two cylinders being an issue, and no backflow valve anywhere in the system. > Is this correct? > > Recently it got worse, and I took it in to him again. At this point, we > figure it has to be something inside the transmission. He drops it, and > replaces everything that looks even a bit suspicious, namely the throwout > bearing release lever, the lever pin, the clutch release bearing, and > the shift bushings. Everything else looks clean, though neither one of us > could see how any one of these would cause the problem. > > Putting the thing back together, the problem is now actually worse, since > the friction point is closer to the floor than it was before. The car is > now doing it almost all the time, making it impossible to drive except on > the highway. > > Help! Anybody have any suggestions about what could be causing this issue? > --scott > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#6
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BMW Clutch Issue
In article >,
jim > wrote: > > >Scott Dorsey wrote: > >> >> Starting around 220,000 miles, the clutch began sticking closed. That is, >> I'd put my foot down, the pedal would stick to the ground, and the clutch >> would remain engaged. > >Can't tell what "clutch remains engaged" means? Does that mean the >transmission is engaged or does it mean the opposite? If it means the >former it is pretty evident that the hydraulics have failed. If it means >the latter then there is no clear indication of a problem with the >hydraulics and the mechanical linkage would likely be the problem. It means the former. But all of the hydraulics have been replaced. I don't see anything else that can be replaced. I do not see any sort of check valve anywhere that could be leaking, either. >> I could pull the pedal up and pump it down a couple >> times and the clutch would open properly again. > >What does "clutch would open properly" mean. If you don't do the pumping >thing then the transmission will remain engaged? or remain disengaged? >or what? It will remain engaged, with the pedal stuck to the floor, which is bad. >>It started happening now >> and then, and then more and more often. > >Has your mechanic actually been able to reproduce the problem or is he >going only by your description of the problem? If he has seen the car >when the problem exists I would take it to another mechanic. He has been able to reproduce it while driving but not up on the lift. I am annoyed that he has been trying to fix the problem by swapping things out, but by the same token everything has BEEN swapped out at this point. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#7
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BMW Clutch Issue
Clutch system is not bled properly. If the hardware is there, and new, the
fluid is good, then it can ONLY be that the system is not bled, i.e. there is air in the line. Clutch hydraulics are as simple as it gets, folks. Get an auto box. Bill in Omaha '86 535i |
#8
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BMW Clutch Issue
Bill > wrote:
>Clutch system is not bled properly. If the hardware is there, and new, the >fluid is good, then it can ONLY be that the system is not bled, i.e. there >is air in the line. That would make perfect sense, and the fact that it is okay when cold but undrivable when hot correllates well with the air in the line diagnosis. BUT, the system has been bled many many times at this point. I cannot imagine there is still any air in it. >Clutch hydraulics are as simple as it gets, folks. Agreed and that is what makes this so frustrating. >Get an auto box. Now, when THOSE fail, you just buy a new car.... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#9
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BMW Clutch Issue
"Scott Dorsey" > wrote:
>>Clutch hydraulics are as simple as it gets, folks. > > Agreed and that is what makes this so frustrating. You didn't hear this from me, Sctoo, but maybe it is time to let Casey look at it. Bob |
#10
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BMW Clutch Issue
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