BMW E21 Rear Differential Restoration

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Hello RU-vid-
We are working on another project with our E21 restoration. We decided to do a restoration on the rear 3.91 LSD differential. As you can see, it was in rusty shape and needed some help. First order of business was to try to scrap as much of the debris we could before hitting it with the pressure washer. The we could begin disassembly and really be able to clean each individual part up. After all of the grease and oil was removed, we took it over to our modified Harbor Freight blast cabinet ( • SAND BLASTING CABINET ... ) and removed the remaining rust and old paint. Next up was metal etch primer and the a few coats of black urethane paint.
Now we get to reassembly the entire unit using fresh o-rings, seals and gaskets. Doing our best to try to now scratch any of the nice new paintjob. As you can see the end result is an amazing transformation. Old rusty diff turned into a brand new looking unit.
Here are the parts used in this video:
Diff Gasket - www.fcpeuro.com/products/bmw-...
Rear Diff Plug - www.fcpeuro.com/products/bmw-...
(2) Side Shaft Seal - www.fcpeuro.com/products/bmw-...
Pinion Seal - www.fcpeuro.com/products/bmw-...
Crush Sleeve - www.fcpeuro.com/products/bmw-...
Securing Plate - www.fcpeuro.com/products/bmw-...
Hope you enjoyed the Video!!!
Cheers!
Follow Bradleys' Garage:
Website bradleysgarage.com -coming soon
Instagram / bradleygarage
If you liked the video, remember to give it a "thumbs up" and consider subscribing.
Thanks again for hanging out!
#bmw #E21 #restoration
Disclaimer:
Due to factors beyond the control of BradleysGarage, we cannot guarantee against improper use or unauthorized modifications of this information. BradleysGarage assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. BradleysGarage recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of BradleysGarage, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not BradleysGarage.

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Опубликовано:

3 фев 2022

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Комментарии : 74

@drlong08 7 месяцев назад

From a fellow E21 owner, thank you!

@BradleysGarage 7 месяцев назад

Thanks for the comments Dr. Long, appreciate the feedback. We hope it inspired you to work on your E21. Glad you enjoyed the video, stay tuned for more E21 content in the near future, Cheers!

@luisleis2281 2 года назад

Excellent restoration!!

@BradleysGarage 2 года назад

Thanks for the kind words Luis, glad you enjoyed the video. Cheers!

@gavinbradley9813 2 года назад

Awesome vid!!

@Sprchgjeep 2 года назад

Looks great! Nice job.

@BradleysGarage 2 года назад

Thanks for watching, appreciate the feedback, Cheers!

@RipVanJester 2 года назад

That was top tier satisfying. Great job on the restoration!

@BradleysGarage 2 года назад

Thanks Jordan, glad you enjoyed the video, Cheers!

@godkmeister533 2 года назад

I love watching restorations! Nice video

@BradleysGarage 2 года назад

Glad you enjoyed the video, thanks for watching, Cheers!

@joelpalmer 2 года назад

Congratulations and well done; amazing level of detail and the quality is outstanding! Thank you for sharing! Keep em coming!

@BradleysGarage 2 года назад

Appreciate the feedback Joel, we will keep working on the E21 and keep putting out our progress. Glad you enjoyed the video, Cheers!

@sensei1781 Год назад

High quality work and attention to detail

@BradleysGarage Год назад

Thanks for the comments Sensei, appreciate the feedback. Glad you enjoyed the video, Cheers!

@runerides8762 2 года назад

amazing work!

@BradleysGarage 2 года назад

Thanks for the kind words, glad you enjoyed the video. Cheers!

@AdamPE21 2 года назад

Love the E21 videos!

@BradleysGarage 2 года назад

Glad you enjoyed the videos Adam. Additional videos are in the works, Stay tuned, Cheers!

@4runner1grfe Год назад

That was satisfying

@BradleysGarage Год назад

Glad you enjoyed the video, thanks for hanging out, Cheers!

@ChrisTrujilloSkyfox 2 года назад

Amazing work. Close attention to detail and precision. Love your videos! I can not wait for more!!!

@BradleysGarage 2 года назад

Thanks for the comments, appreciate the feedback. Stay tuned for more to come, Cheers!

@treylawson6175 11 месяцев назад

@@BradleysGarage😮😮😮😮😮😮😅e😮😮😮😮😮😅😅

@treylawson6175 11 месяцев назад

😮😮😮e😮😮😮😮😮😮e😮😅e😮😮😅r😮😮😮😮😮😮😮😮😅w😅😅

@treylawson6175 11 месяцев назад

@@BradleysGarage😮😮😮😮😅😮😮

@treylawson6175 11 месяцев назад

E😮e

@MathisFlooo Год назад

Amazing, do the same video in timelaps -> 1M view

@BradleysGarage Год назад

Thanks for the comments Jazon, glad you enjoyed the video. We did create a short with this footage but we are a little shy of the 1M mark... 😜 ru-vid.com9gyObrzoIiY?feature=share Thanks for hanging out, Cheers!

@outtatime4512 Год назад

I like the rotisserie.

@BradleysGarage Год назад

Thanks for the comments Eric, it's actually pretty handy for more than just filming stuff. Great addition to the garage toolbox. We picked it up from JEGS for less than $50. www.jegs.com/i/JEGS/555/81495/10002/-1 Cheers!

@outtatime4512 Год назад

@@BradleysGarage thx for the link. You do nice work. 👍

@BradleysGarage Год назад

Thanks man, appreciate the feedback. Cheers!

@reynerwiratama6219 2 года назад

Can you please do more e21 restoration or upgrandes? It has been really helpful with the last caliper upgrade. Thank you sir

@BradleysGarage 2 года назад

Thanks Reyner, we have lots of upcoming E21 stuff in the works, stay tuned. Appreciate you hanging out, Cheers!

@RipHammer300 2 года назад

ASMR.

@BradleysGarage 2 года назад

Ahhhh, the sweet sweet sounds of Tink, Bang, Blast and Spray. Music for the ears, glad you enjoyed the video, Cheers!

@kevinvanhaperen6043 Год назад

I've got so many questions. What did you do with the clock? Did you reuse the crush spacer? Did you reuse the outer rings of the bearings (because you didnt show removing and fitting them)? What about checking the backlash? I think if you added some of that info into the video you'd make a 10/10 video a 12/10 video :D I'm currently on the edge if I should attempt this myself or have someone do it (incl converting to LSD). This video certainly gave some extra confidence.

@BradleysGarage Год назад

Hey Kevin, thanks for the questions. I am not sure what "clock" you are referring to? The crush sleeve was replaced (link in the description) and set to the proper drag. We did not change the bearings out on this video. If you mark the sides and put all parts back in their original positions you can reassemble without any issue. If you don't want to hassle with the full disassembly, you can leave the flange intact and still perform a very good external restoration. We plan on posting another video of the full bearing replacement along with the shim settings. Then we can demonstrate the backlash markings and adjustments. Good luck on your project, Cheers!

@davidalcaria6305 2 года назад

Congratulations for the video. I am about to renew mine as well. What torque resistance are you looking for when turning clockwise and anti clockwise the end that links to the trans shaft ? Best regards

@BradleysGarage 2 года назад

Thanks for the comments, glad you enjoyed the video. We are looking for around 18-20 inch pounds of drag for the pinion gear. The book says 15-29 in lbs when using a new seal so I just went in the lower middle of that range. Good luck with your project, Cheers!

@n7slc 8 месяцев назад

Rewatching because this is ASMR for classic BMW owners... Did you replace the clutch discs for the LSD?

@BradleysGarage 8 месяцев назад

Thanks for the feedback we are glad you enjoyed the video. On this particular diff it only had 121K and the breakaway torque was around 25-27 ft. lbs. We decided to keep it as is for now but we may record another video that covers the bearings and clutches along with setting the lash. Thanks again for hanging out, Cheers!

@apitochelli 2 года назад

Nice resto! How is that sand blasting cabinet working out? Are there any mods or issues after the fact of the upgrade video for the cabinet?

@BradleysGarage 2 года назад

Hey Ashlin, thanks for the comments, glad you enjoyed the video. We have been very happy with the upgrades to the blast cabinet. Everything is working out well and functioning good. I think the next upgrades for us will be a foot pedal for those longer projects and a larger compressor so we can take fewer air recharge breaks. The rear subframe and trailing arms will be next on the to do list, so stay tuned for those, Cheers!

@samjohnson4994 Год назад

Fantastic video, thanks so much. I just got myself this exact diff. Not sure if I want to do a full rebuild on it. Could you just take off the cover and clean out the internals and re-oil?

@samjohnson4994 Год назад

Oh, also, what oil did you fill it with afterwards?

@BradleysGarage Год назад

Hey Sam, thanks for the questions. I would recommend cleaning the exterior of the diff first if that's important to you then you can definitely remove the rear cover and drain it completely. You can use brake cleaner to remove the majority of the left over residue as gear oil is pretty nasty stuff (stinky too). Just make sure you are ready to reassemble after cleaning as you don't want any bare metal surfaces to be left to start corroding. In regards to the oil, you can use any quality 75W-90 gear oil. Redline, Royal Purple, Torco and Motul are all great choices. You will need about 1.2 quarts for the diff so you will need 2 quarts. Gear Oil - www.fcpeuro.com/products/75w90-gear-oil-quart-oil-57904 Diff gasket - www.fcpeuro.com/products/bmw-differential-cover-gasket-33113604117 After the refill, if it's removed from the car, i would spin it around to properly coat all the internal components. Or if it's still in the car, take it for a spin around the block to coat everything. You can also service the manual transmission while you are under there as well. You will need around 1.5 quarts for the trans so you will also need to purchase 2 quarts. Trans Oil - www.fcpeuro.com/products/manual-transmission-gear-oil-redline-83522-50204 Good luck on your E21 project, Cheers!

@samjohnson4994 Год назад

@@BradleysGarage why are you so helpful! Haha thankyou 🙏 have ordered the redline oils, managed to find them in Australia. It's currently auto, but I've got a manual box ready to get installed so I'll do the oil before I install it. Thanks again

@BradleysGarage Год назад

No worries Sam, glad you were able to source the Redline oil locally. Enjoy working on your E21, Cheers!

@n7slc 9 месяцев назад

Wow...just, wow. I'm bringing my '83 320i with the sport package back to life and I need to go through the rear diff. I don't know where you're located, but if you were close to SLC, I'd pay you to do mine.

@BradleysGarage 9 месяцев назад

Thanks Dan, it's definitely a process to bring these back to life. We are located in Southern California, so a bit far from SLC. Not sure if you saw our other E21 video where we did the paint correction? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hpP4fP4HGFo.htmlsi=Du750HiG3y2l10AJ Ours has been in the garage for the past 20 years. So we are in the process of refreshing everything. Stay tuned for more E21 content in the future. Thanks again for hanging out and good luck on your E21 restoration. Cheers!

@n7slc 9 месяцев назад

@@BradleysGarage Thanks for the reply! I see that you used what looks like a torque wrench with a needle on the input shaft. Is that for checking the correct preload on the bearing? I haven't watched the paint correction vid, but I will. I'll look forward to more E21 content. Sub'd. 👊

@BradleysGarage 9 месяцев назад

Hey Dan, yes that is an small old school torque wrench so we can test the drag on the bearing. That will need to be done if you remove the nut. On another diff we left that in place and just pulled the shafts out and replaced the seals. As long as you put them back on the same side with the same shims, you shouldn't have any issues. Thanks again for the sub, appreciate you hanging out. Cheers!

@XiseTK 2 года назад

About to do the same for my e21, so glad to find out my non 320is car has an LSD. Any reason for the "S" stamp at the end?

@BradleysGarage 2 года назад

All the E21 factory LSD's had an "S" ink stamp on them, as most of the 80's BMW's diffs did. Some of them had a thin square around the S as well. They also have a hard stamped "S" in the case itself. I added a few images so you can see what the OEM ink stamp looked like: ibb.co/album/TD8Xwq Since these are 40+ years old now, most of them have worn off or like this diff, are covered in rust and grim and are no longer legible. My goal was to try to replicate the OEM ink stamp the best I could. Good luck with restoring your LSD unit. Cheers!

@xatzmike 4 месяца назад

Hello, could you share torque specs for the 6-bolt side bearing caps? 13:55

@BradleysGarage 4 месяца назад

Thanks for the question, the side bolts should be torqued to 25 ft. lbs. Good luck on your diff project, Cheers!

@Exekutioncro 5 месяцев назад

14:00 you put in the gasket dry or with oil?=

@BradleysGarage 5 месяцев назад

Thanks for the question. We didn't show it on the video but it was a quick wipe with a wet finger on the metal flange. Just enough to help the new seal slide right in and not "hang up" on anything. Cheers!

@Exekutioncro 5 месяцев назад

@@BradleysGarage Thank you!

@fredrikrapp 11 месяцев назад

Were can I get that S-stamp?

@BradleysGarage 11 месяцев назад

Hey Fred, we purchased the rubber ink stamp from TheStampMaker.com. Here is the item number direct link - www.thestampmaker.com/Products/Wood-Rubber-Stamp-L1-x-H2__I-WH1X2.aspx We also have 1-2 extra stamps that we made up for some other guys so they might still be here on a shelf if you just want to purchase one from us directly ready to go. I know we had to create the custom font "S" image to replicate the design from BMW. Shoot us a message over on our Instagram page and we can work out the details. Cheers!

@typhoon320i 2 года назад

What was the torque spec for the fill and drain plug?

@BradleysGarage 2 года назад

Hey Typhoon, thanks for the question. The manual states around 35 ft/lbs for the crush washer style (I used this on my my full plug). The newer style with an o-ring (I used this on my rear fill plug) is the silver plug only needs about 25 ft/lbs. Just remember that you can always tighten them a little more if you have seepage. If you crank them down too much initially, you run the risk of cracking the rear cover, since it's only aluminum. Good luck on your project, Cheers!

@typhoon320i 2 года назад

@@BradleysGarage Thanks for the help. Mine is the washer style. almost ready to reinstall in the car.