01-13-2020, 10:08 PM | #1 |
Captain
599
Rep 997
Posts |
Diy request: differential bushings.
Hi, im looking for a diy to replace my diff bushings. Ive read the tis and it seems to outline these steps(going off memory, might not be exact):
-Remove exhaust. -Remove heat shield. -Remove support brace. -Driveshaft needs to be disconnected from the diff and supported. -Passenger rear axle shaft needs to be removed. -Driverside rear axle shaft needs to be disconnected from the diff and supported out of the way. -Drop subframe ~30mm using longer bmw bolts. -Unbolt diff and remove. -Change diff bushings. I plan to go with powerflex bushings for ease of install. Are there any shortcuts to my list? Do i really need the special tool to remove the rear axle shafts? Will two flat heads on opposite sides be able to remove the axles from the diff? Thanks for any help or tips. |
02-24-2020, 03:24 PM | #2 | |
Private
79
Rep 98
Posts |
Quote:
http://bd8ba3c866c8cbc330ab-7b26c6f3...stallation.pdf |
|
Appreciate
0
|
02-24-2020, 04:14 PM | #3 | |
Captain
599
Rep 997
Posts |
Quote:
|
|
Appreciate
0
|
02-25-2020, 03:11 PM | #4 |
Captain
599
Rep 997
Posts |
They are dropping the entire subframe to swap out the bushings. Not sure if thats easier or not from the BMW instructions, its nice they didnt need to remove the rear axles. I think im gonna try the BMW way of lowering the subframe a little bit but leave the rear axles connected. Hoping there is enough room for me to drill out the rubber bushing and then use a hacksaw or something to cut the bushings metal sleeve. Since the PF bushing is a two piece design, i hope there is enough room to squeeze them in. Dont have to bother using a bushing remover/installer.
Will create a DIY if its successful. |
Appreciate
1
NORAGRETS455.00 |
02-25-2020, 03:21 PM | #5 |
Major
619
Rep 1,239
Posts |
Diff.
DIY + Hacksaw = Doesn't sit well with me. My .02. GL
__________________
2016 Hellrot F80 M3|JRZ RS Pro with Swift Springs 550/750 spring rates l AP Radical 5000R 9668/9449 lSpiegler SS LinesI DS1.11I Eisenmann DP|MPE Catback|18" Forgeline GS1R 18x10 et 22 and 18x11 et 44 NT01 275/35/18 and 305/35/18| Forgeline GTD1 18x10et43 SquarelM Performance Lip/Splitter|IND aesthetic mods|Dinan Toe Link|Fall Line mono ball conversion kit and upper link kit| Aim Solo 2DL Smarty Cam|Simpson Hybrid|Stilo Offshore helmet.
|
Appreciate
0
|
02-25-2020, 03:57 PM | #6 |
Captain
599
Rep 997
Posts |
I've done it before with success on other cars. Its to weaken the bushing sleeve so you can hammer a flat head on the sleeve to deform it and make it smaller for extraction. Wont know the best course of action until im in front of it. I think i would be able to support and lower the diff to give some space for a threaded rod to press the bushing out, id prefer that. |
Appreciate
0
|
03-03-2020, 08:07 AM | #7 |
The G8X is a disaster. 🤮
931
Rep 988
Posts |
This is a routine procedure for replacing bushings. Cutting the sleeve with a hacksaw only takes a couple minutes and saves tons of effort trying to press the bushing out. Once it’s cut it generally slides out easily.
|
Appreciate
2
hC1001598.50 Drifter2090911.00 |
03-05-2020, 09:01 PM | #8 |
First Lieutenant
66
Rep 352
Posts |
I think you are on the right path, I am also going to do a similar thing to get mine out !!
|
Appreciate
0
|
08-23-2020, 11:14 PM | #10 |
Captain
599
Rep 997
Posts |
It was do-able. You can actually remove the bushing from the metal sleeve. I used a hacksaw blade to make a cut on the sleeve and then used a small flathead screwdriver to bend the sleeve inwards. Its pretty straightforward. The biggest pain in the ass was the front driverside diff bolt. The fuel tank is in the way, so you have to drop the subframe to get clearance.
|
Appreciate
1
DLag30103.50 |
08-24-2020, 10:26 AM | #12 | |
Captain
599
Rep 997
Posts |
Quote:
I actually didnt have any common symptoms associated with a bad rear diff bushing. Only noticed it because it was torn. The new PF bushings feel good. Similar or slightly better to how the car feels new. You can go with the PF black series if you want stiffer. Just make sure you give slack to the brake lines, ebrake cable, subframe ground cable, etc... when lowering the subframe. My biggest goals were to replace it without removing the rear axles or driveshaft from the diff. Its strange that the TIS repair instructions dont mention anything about that driverside front diff bolt. I couldnt get to it using the extended repair subframe bolts because the fuel tank is in the way. Last edited by hC1001; 08-24-2020 at 10:32 AM.. |
|
Appreciate
0
|
08-24-2020, 10:35 AM | #13 | |
Captain
599
Rep 997
Posts |
Quote:
I actually didnt have any common symptoms associated with a bad rear diff bushing. Only noticed it because it was torn. The new PF bushings feel good. Similar or slightly better to how the car feels new. You can go with the PF black series if you want stiffer. Just make sure you give slack to the brake lines, ebrake cable, subframe ground cable, etc... when lowering the subframe. My biggest goals were to replace it without removing the rear axles or driveshaft from the diff. |
|
11-08-2020, 09:45 PM | #14 |
First Lieutenant
227
Rep 369
Posts |
I just finished this job, and I don’t see why the TIS says to remove either axle. Following the ECS guide method is definitely the way to go. Removing the drive shaft isn’t a huge deal, and it definitely is easier than tiptoeing around it.
__________________
///M3
|
Appreciate
0
|
11-09-2020, 08:43 AM | #15 | |
Captain
599
Rep 997
Posts |
Quote:
In the TIS, they want you to remove the differential from the carrier first before replacing the bushings and you cant remove it with the axles still attached. |
|
Appreciate
0
|
11-10-2020, 12:12 PM | #16 | |
First Lieutenant
227
Rep 369
Posts |
Quote:
__________________
///M3
|
|
Appreciate
0
|
11-10-2020, 04:00 PM | #17 |
Lieutenant Colonel
1396
Rep 1,988
Posts |
How many miles are people replacing these things at? Seems like a Pita problem to have to deal with.
__________________
2022 X5 45e : AW/Tartufo
2018 M3 Competition : AW/SO 2016 340i xDrive : AW/CR (sold) |
Appreciate
0
|
11-11-2020, 01:21 PM | #18 | |
First Lieutenant
227
Rep 369
Posts |
Quote:
My car is at 34k and the bushing looked like this. As far as how much of a PITA, I'd say it's slightly easier than replacing the clutch. It's a lot of the same prep work, but R&R of the rear sub frame is easier than the transmission.
__________________
///M3
|
|
Appreciate
0
|
11-11-2020, 02:06 PM | #19 | ||
Lieutenant Colonel
1396
Rep 1,988
Posts |
Quote:
__________________
2022 X5 45e : AW/Tartufo
2018 M3 Competition : AW/SO 2016 340i xDrive : AW/CR (sold) |
||
Appreciate
0
|
03-23-2021, 09:28 AM | #20 | |
Private First Class
38
Rep 116
Posts |
Quote:
How'd you remove the bushings? I heard BMW have a diff bushing removal tool, just haven't found it that says it fits the F80. Did you unbolt the driveshaft? |
|
Appreciate
0
|
03-23-2021, 10:48 AM | #21 | |
Captain
599
Rep 997
Posts |
Quote:
"The rear axle support must be lowered to disassemble and install the rear axle differential. In order to prevent lowering of the rear axle support beyond the specified dimension, the originally installed screws of the rear axle support must be replaced by repair screws M12x1.5x115 (part number: 07 14 7 426 660). It is essential to fit the repair screws M12x1.5x115 with washers 37x2.5 (part number: 31 33 6 776 760)." I still had to lower the driverside even more because one of the front diff bracket bolts is blocked by the fuel tank. The repair bolts arent necessary but it helped suspend the subframe. Post 10 for diff bushing removal. Used a hacksaw blade to cut the sleeve. The rubber part of the bushing is removable from the sleeve once you make space for it. I only unbolted the driveshaft from the guibo. Left it connected at the differential input shaft. Just hang the driveshaft with a ziptie to the chassis. Theres special procedures to installing it and there are some people who had a clunk develop after disconnecting it from the input shaft. I wanted to avoid disconnecting it from the diff input shaft and its possible to complete the work with it connected. I also dont have any clunks after the repair. |
|
Appreciate
0
|
03-23-2021, 11:02 AM | #22 | |
Private First Class
38
Rep 116
Posts |
Quote:
I was going to get the press tool, https://www.ecstuning.com/b-schwaben.../024979sch01a/ I haven't had great luck in the past cutting bushings out. What repair manual are you referencing? Is there an online copy of it? |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|