My E39 M5 has Spun Rod Bearing - Page 4 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #31 of 40 Old 4th March 2019, 01:03 AM
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Originally Posted by boris1 View Post
ALex, just to further answer your question, if you can spin the rear wheels by hand with the transmission in any gear and the clutch pedal released, then the transmission is coming out no matter what and that should be your priority over rod bearings. Once the transmission is out it should be relatively easy to do the diagnosis of what is wrong.
Please follow boris1's advice here, OP. There is no use continuing to speculate. Pull the tranny and get a gander of what's going on.

--Peter
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post #32 of 40 Old 4th March 2019, 01:05 AM Thread Starter
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Originally Posted by boris1 View Post
For the differential, your best bet is to spin the driveshaft by hand with the transmission in neutral. If you broke some teeth off the ring gear (highly unlikely) then by turning the pinion gear you will likely find the spot where the pinion can turn without the driveshafts turning. That is a definitive differential failure sign. Also, if you feel any binding while turning the diff, then that is a giveaway as well. However, if you transmission is still in the car and attached to the drive shaft, then you can't determine if the binding is coming from the trans or the diff. Likely the trans and/or prop shaft are coming out to diagnose this driveline issue.
I will go ahead and make sure my friend and I go through all of these tests when I bring it to his shop. I am going to assume he probably already knows these tests or at least some of them, but will make sure we cover all of them in these posts. Sounds like we will have some work ahead of us. You guys have been really helpful thus far and it is greatly appreciated.
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post #33 of 40 Old 4th March 2019, 01:09 AM Thread Starter
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Originally Posted by Sailor24 View Post
Maybe, but I can't think of anything except if you forgot to put in an oil filter. If that is true you might have a spun bearing or 3 maybe even 8, but then I would have no idea why the car won't move. I suppose the crank could have broken. Without the filter being in place the drain would be open and I have never sat down and thought about how that would make a mess. Maybe that is the first thing you should check. If you find that just call Clem and get a motor, because I am pretty sure that one would be toast and not rebuildable.
I really cant imagine that I would have forgotten to put in the oil filter but I could see how that would not be good. If it wasn't raining/snowing I would go check right now. I really hope I did not make such a disastrous mistake from something as simple as replacing the oil filter and forgetting to put the filter in lol That would be the worlds most expensive oil change.
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post #34 of 40 Old 4th March 2019, 01:15 AM Thread Starter
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Another thought about checking the differential. After the 'spin check', maybe check the differential seals? I mean, is there fluid in the case? Is there signs of leaking fluid? No or low fluid would be a sure way to smoke one. Just a thought.

We're all just throwing ideas around and I don't want to overwhelm you but I'd be checking the transmission aft before I got too heavy into the engine.
When I bought the car it did have a "weeping" rear differential and the rear main seal was also "weeping". No leaks just weeping which was visible upon inspection....but I never had any puddling or spots in my driveway.

I actually bought new rear differntial seals and rear main seal, I just never got around to having them put in before all of this happened.

Sorry if this seems like a stupid question but does the e39 M5 have a front differential and a rear differential? or just a rear differential? I am assuming it is only a rear differential since it is rear wheel drive.

Last edited by alexE39M5s62; 4th March 2019 at 01:20 AM.
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post #35 of 40 Old 4th March 2019, 01:17 AM Thread Starter
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Originally Posted by herrubermensch View Post
Please follow boris1's advice here, OP. There is no use continuing to speculate. Pull the tranny and get a gander of what's going on.

--Peter
Thank you for the reply I am definitely going to have all of the transmission checked out you guys are definitely a huge help right now.
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post #36 of 40 Old 4th March 2019, 02:16 AM
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Quote:
Originally Posted by alexE39M5s62 View Post
When I bought the car it did have a "weeping" rear differential and the rear main seal was also "weeping". No leaks just weeping which was visible upon inspection....but I never had any puddling or spots in my driveway.

I actually bought new rear differntial seals and rear main seal, I just never got around to having them put in before all of this happened.

Sorry if this seems like a stupid question but does the e39 M5 have a front differential and a rear differential? or just a rear differential? I am assuming it is only a rear differential since it is rear wheel drive.
You're correct. Being rear wheel drive, your M5 only has a rear differential.

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post #37 of 40 Old 4th March 2019, 03:25 AM
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Wow. OP, if you want some local help with this reach out to me by PM and I'll forward my number. I have several S62's available and some thoughts that might help.

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post #38 of 40 Old 4th March 2019, 04:43 AM
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OP just ship your car to him, it makes the most sense and will be the most reasonable choice in the long run. He knows what he is doing.
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post #39 of 40 Old 4th March 2019, 04:35 PM Thread Starter
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Wow. OP, if you want some local help with this reach out to me by PM and I'll forward my number. I have several S62's available and some thoughts that might help.
Sent you a PM
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post #40 of 40 Old 4th March 2019, 07:09 PM
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