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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-17-2012, 12:23 AM   #1
lab rat
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Does my mechanic know what he's doing? (diff input flange)

Hi guys,
I just had my diff rebuilt and input flange swapped. At the same time he installed limited slip gears. When I picked up the diff I noticed the input flange is very difficult to spin (I can barely move it with my hands).
The mechanic says it will get better when I fill the diff up - there is no oil in it now.

What problems could overtighten input flange cause?
Thanks
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Old 01-17-2012, 08:52 AM   #2
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Quote:
Originally Posted by lab rat View Post
Hi guys,
I just had my diff rebuilt and input flange swapped. At the same time he installed limited slip gears. When I picked up the diff I noticed the input flange is very difficult to spin (I can barely move it with my hands).
The mechanic says it will get better when I fill the diff up - there is no oil in it now.

What problems could overtighten input flange cause?
Thanks
Your diff will go bye bye fast. The backlash will be too small, among other things. Depending on the clearances, of the ring gear/pinion one of the two will be destroyed. IIRC the spec is like between 3 and 6 thousandths. It took me almost a whole day to get my pinion depth correct. Ask him for your backlash and pinion depth. He should know exactly what he set them to. Diff rebuilding isn't as bad as doing auto trannys but it is a total PITA. Your pinion shouldn't be that hard to spin. It could also be that the side clearances were made too tight so it feels like it's the pinion bound up but it's not. heh lots. GL OP!

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Old 01-17-2012, 09:05 AM   #3
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+1 on the above post.
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Old 01-17-2012, 11:06 AM   #4
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Nice, that's what I was afraid of. I don't really care about the diff, those are cheap. I just don't want metal shavings destroying my $1500 LSD.

So the diff too tight could be caused by two things:
1. the pinion is in too deep
2. there is too much preload on the input shaft bearings

My money is on #2
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Old 01-17-2012, 11:23 AM   #5
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Right and as soon as it heats up it is only going to get tighter.
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Old 01-17-2012, 11:55 AM   #6
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So the solution is to get a new crush sleeve and try to tighten the input shaft nut myself?
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Old 01-17-2012, 12:41 PM   #7
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Are you using new bearings? Shims and all? Whats the Preload? Get some Gear paste and spread some on the gears and do a couple runs on it so we can see the pattern.
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Old 01-17-2012, 12:45 PM   #8
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Now this is mechanic talk, I have no idea what's going on, but I want to learn!
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Old 01-17-2012, 01:14 PM   #9
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Now this is mechanic talk, I have no idea what's going on, but I want to learn!
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Old 01-17-2012, 01:38 PM   #10
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I'm not gonna mess with it. I paid the guy to do it for me so I wouldn't have to. I'll take the diff back and ask him to do it right.
I still think it's just the input shaft bearings being too tight.
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Old 01-17-2012, 01:47 PM   #11
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I'm not gonna mess with it. I paid the guy to do it for me so I wouldn't have to. I'll take the diff back and ask him to do it right.
I still think it's just the input shaft bearings being too tight.
Lol open the cover and slap some paste. Only way u would know. Can't go by I think it's to tight. Preloading Bearings and Shimming comes all to play. They will loosen up after a few runs.
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Old 01-17-2012, 07:41 PM   #12
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Good luck man, let us know! Don't open the cover, the finger pointing will start! Shop name would be good for locals.

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Old 01-18-2012, 01:04 AM   #13
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False alarm
Looks like I panicked for no reason. Filled the diff, spun it a bit and it behaves as it should.
Case closed, I'll try not to be such a drama queen.
Thanks for your help.
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