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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Feb-16-2017, 07:15:34 AM   #11
TheCoder
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Default Re: Lateral play in Input flange

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Originally Posted by AndresC View Post
Hey TheCoder! Sorry to hear that happened. Just curious, what were you doing on your diff?
I replaced the input seal.

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Old Thu, Feb-16-2017, 03:59:35 PM   #12
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Default Re: Lateral play in Input flange

More likely it was under tightened... since you're already basically screwed, tighten it just until the play is gone and then on to your mark.
If the bearings haven't already been damaged from being run at incorrect preload, and if you can get it back to where it started... you might still be OK!
Couple of minor 'ifs' there.
Good luck!
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Old Thu, Feb-16-2017, 06:29:49 PM   #13
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Default Re: Lateral play in Input flange

this makes no sense... not sure how it's even possible to have any play in your input shaft flange.

you're pinion is fine but you may have overloaded the bearing behind it... is it leaking again?
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Old Thu, Feb-16-2017, 06:52:57 PM   #14
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Default Re: Lateral play in Input flange

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Originally Posted by BearDeXPS View Post
this makes no sense... not sure how it's even possible to have any play in your input shaft flange.

you're pinion is fine but you may have overloaded the bearing behind it... is it leaking again?
Nope, no leak

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Old Thu, Feb-16-2017, 07:02:42 PM   #15
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Default Re: Lateral play in Input flange

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Originally Posted by nowanker View Post
More likely it was under tightened... since you're already basically screwed, tighten it just until the play is gone and then on to your mark.
If the bearings haven't already been damaged from being run at incorrect preload, and if you can get it back to where it started... you might still be OK!
Couple of minor 'ifs' there.
Good luck!
Gonna give it a shot this weekend. Still debating if i should just upgrade all together.

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Old Sun, Feb-19-2017, 08:07:37 PM   #16
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Default Re: Lateral play at Input flange

Ok, the good news is that the nut is under torqued !

Also, seems like i didnt place the retaining plat of the nut which caused it to get loose.

I will tighten it based on the marking and double verify using a method I came across which relies on carefully inspecting the radial torque of the yoke. Ill post details later

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Last edited by TheCoder; Sun, Feb-19-2017 at 08:43:58 PM.
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Old Sun, Feb-19-2017, 10:12:40 PM   #17
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Default Re: Lateral play at Input flange

So i cant recall the revs when i removed thr nut, but looks like i wont need to anyway since the first alignment of the centerpunch marks is at less than 10 ft lb, and the next rev to align the markings on the nut and pinion shaft takes over 140 ft lb , which isnt unusual (right?)

Anyway, i got 1/6 of a rev left and already at 150 ft lb, but though id take a break and post this in case anyone thought such high torque on the input flange nut is abnormal.



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Old Sun, Feb-19-2017, 10:23:44 PM   #18
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Default Re: Lateral play in Input flange

While I was doing my R&D I came across a useful write ups on what to do if you don't have your input flag nut and pinion marked

http://bernardembden.com/xjs/diff/index.htm

if the link is is broken, then just download the PDF from here

https://drive.google.com/open?id=0B-...TRKY3hyTnRrLVU

(Notice: Credit to Bernard Embden)
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Old Mon, Feb-20-2017, 06:43:07 AM   #19
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Default Re: Lateral play in Input flange

Over tightening will not cause play in the input flange. If you over tightened you will get a whine after some time not immediately ( not unless you torqued the crap out of it). Over tightening is least harmful when compared to under tightening. I think you under tightened because the would allow play where as over tightening will not. Under tightening will allow the pinion height move away from the ring gear and this will make sh1t of your gears unfortunately.

On the bright side the play could be in the CV joint itself and not from an under tightened flang.

Check it asap.

Edit... Just read through the previous comments and it seems you sorted it.

When it comes to torquing that nut, there is no common torque value and you should not measure it like you did because it's not accurate as every diff is different and depending on how you lock the diff to torque it will vary the readings. The way to measure the torque is in inch pounds and the total force should be around 25-30 inch lbs area. This is the effort to turn the entire unit.

So you would either measure this before disassembly or if you didn't, tighten the nut gradually and then check the torque value. Tighten some more and check the torque until you reach the correct preload of 25-30 inch pounds( I think) .

Last edited by schoonerm3; Mon, Feb-20-2017 at 09:50:08 AM.
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Old Mon, Feb-20-2017, 07:12:22 AM   #20
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Default Re: Lateral play in Input flange

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Originally Posted by schoonerm3 View Post
Over tightening will not cause play in the input flange. If you over tightened you will get a whine after some time not immediately ( not unless you torqued the crap out of it). Over tightening is least harmful when compared to under tightening. I think you under tightened because the would allow play where as over tightening will not. Under tightening will allow the pinion height move away from the ring gear and this will make sh1t of your gears unfortunately.

On the bright side the play could be in the CV joint itself and not from an under tightened flang.

Check it asap.

Edit... Just read through the previous comments and it seems you sorted it.

When it comes to torquing that nut, there is no common torque value and you should not measure it like you did because it's not accurate as every diff is different and depending on how you lock the diff to torque it will vary the readings. The way to measure the torque is in inch pounds and the total force should be around 25-30 inch lbs area. This is the effort to turn the entire unit.
Thanks. It seems like it was under tightened as evident by the fact that i needed little force to release the nut , but i couldnt do so with my bare hands either.


I am concerned about any damage to the pinion or ring gears, so will empty the diff fluid and check for discoloration or metal parts stuck to the magnetic drain plug .

Ia the torque range you provided what is needed to move the entire unit with or without the diff fluid ? With or without the output axle attached ?


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Last edited by TheCoder; Mon, Feb-20-2017 at 07:17:49 AM.
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Discussing Lateral play in Input flange in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)