Alternator repair : Noisy Bearings replacement 

Clear explanatory video without need for silly loud music and unnecessary chat. Well done.

That was the best "how-to" video I have ever seen. You deserve some kind of award for doing it w/o words. Loved the smiley face when the hot-cold to shrink and expand worked.

heat up the case, freeze the shaft... Dude, you're a genius!!!

This is the best how-to video I've seen. Very informative, with no blabbering, bad music, or cussing. Thank you very much!

This has to be my absolute most favorite RU-vid video on replacing bearings

Hey, Bro- I just finished a *full rebuild* of my 1989 CS144, and I used your "freezer trick" for the Rotor and *outer* bearing. It worked perfectly! *Thank you so much!* I will be posting a slideshow of my work to my channel in a couple of days.

Nicely compressed into video without sacrificing any details of the job. Thanks!

Congratulations! You've got serious skills. Ingenuity, skills and patience. A great mix for a successful mechanic.

Great mechanical skills. Thank you for making the video. I will try rebuilding mine.

Loved it! Seriously, this was a great how to. Even though it made me cringe when I saw the angle grinder I have to hand it to ya, we work with what we have. I LOVE IT! Well done dude.

Gracias por el tutorial hermano! Pensaba que era difícil cambiar los rulemanes. Me ahorre AR$2000!!! Genioooo!!!

awesome video,i have a noisy alternator that i bought bearings for and hadn't got inspired to do anything about. i especially love the components heating and freezing with the bearing essentially falling in place.thank you!

Great video. One tip: a small two or three jaw puller would have made short work of that bearing. They can be rented at most auto parts stores. A lot easier then using a grinder to cut the bearing off, and less chance of damaging the shaft or cooling fins.

My alternators just gone and I don't see why I can't do what he's just done, great video!

AWESOME VIDEO, No yapping and right to the point.

Best quality, HD video camera views I have seen. A tripod-mounted camera cannot be used everywhere, but certainly helped here. Your removal of the bearing with an angle grinder shows both care and practice, especially the inner race of the bearing. Continuous sound and screen captions for important points helped orient us, but more caption detail on some parts might help-- especially on the heating and cooling of the aluminum housing. Or, perhaps something as simple and direct as your voice, describing the process in general terms and adding detail, as you go..

For those people, who happen to not have an angle grinder: *Use a bearing puller.* Also it is much easier to remove the pulley nut, if you pull the alternator apart, then put the rotor into a vice.

it was very easy to understand the explanation about how rebuilt the alternator bearing without damage other parts. Thanks.

Thanks for the great video.

Wow Ive been a mechanic for 20 years, Ive seen all sorts of tricks to remove bearing from shafts, but never has an angle grinder been involed lol. Ur freakin awesome to not have caused any damage thats hectic. Nice one mate 👌 I'll stuck with my pullers haha.

Not sure why people are hating on this, it's a fun little video (even though I don't plan to do this because it's not worth my time). As far as melting the winding varnish or deforming the housing....right now you have a bad alternator and if it's doesn't work out then you have a bad alternator. Lol

how do you know what bearings you need to buy?

I've done qite a few like this and never had a problem,some of the old tricks are the best,you just need some common sense, if you bought every pissy ass tool they make for this and that you would go broke real fast,good technicians know how to do things with less. ,good high speed vid man. 😊

A good and well executed video. As the title states, it doesn't require any fancy tools, although you could run the risk of damage from that grinder. I would personally use pullers and press tools. But, a very good video.

I've repaired a good few alternators and I've never known a rear bearing to require replacement. Front bearings can usually be levered off with a pair of small pry bars as they are only pressed on, not shrunk-on. A Chinese generic bearing used to only cost 50p so even after paying for Loctite for the screws there is a huge saving over buying a Service Exchange unit. Allegedly some of those Chinese bearings are made on the same production line as the top brands but they don't put a trademark on them.

Excellent video and has saved me the cost of a new alternator, many thanks!

what is the logic by putting those parts in deep freezer and oven.

Your video is helps will save a lot of money to the car owners by doing itself. thank's a lot Michael.

how about when you spark and burn the varnish of the windings with that grinder. we have a bearing puller. as for the freezer and heating up the bearings thats a given.

This couldn't be a better video. I really appreciate it.

Thank you for great lesson.

I have made the same thing with 2 alteranators, but i have change also the colector and the brushes. Works like new. Nice job.

Great work man!

When you don't have an inductive bearing heater cook one up,lol. I am an industrial maintenance technician and we have an inductive bearing heater. It is for putting the inner race of the bearing back on the shaft. You only have about 30 seconds once you remove the bearing from the heater to get it on the shaft in the right place before it cools and locks on the shaft. If it cools on the shaft in the wrong place its do over time. Nice job on that alternator!! Improvising at its finest! Another way to heat a bearing is get cooking/automotive oil and a thermometer and heat the oil with the bearing submerged in the oil.

To all of you saying "this isn't the right way".....It worked, didn't it? It doesn't have to be done your way.

While a Work bench & more tools are NICE,.... It's VERY NICE, seeing someone show things being done in the Simplest way, with the Simplest basic tools. (the way I had to for many yrs. lol)

Very good man!

Thanks bro, now i know how many bearings i can change :D cheers!

Nice! Makes it look like a simple enough job. Going to save me the cost of a new BMW alternator. Thank you, sir.

after watching this i think i will just buy a reconditioned alternator

So I am guessing... say about couple thousand bolts and screws..:) But what an Amazing video... No Bs and showed every thing in clear detail. Good Job Sir.

LOL! How about using a bearing puller?

Great video! Fixed the bearings in my 2010 Mercedes-Benz Bosch alternator. Thanks for posting!

Hard work.... Great job buddy !!!!

If only the government and media approached their work like this.... Amazing lesson in working to get the job done

this is what true mechanic looks like. he fix the problem not just throw away parts that actually still working fine, usually a lazy mechanic just throw away this alternator and charge costumer to pay the new one. i respect this guy so much

There's just something about BRAND...NEW...BEARINGS!!!! Nice work!!! : ) Don W.,Ohio, USA!

awesome video buddy.

Very informative video on what bearings look like in the alternator and how to replace it. I think the bearings in my alternator were causing squeaky sound and one of reasons alternator is weak and draining the battery. I don't have all the tools that you have to change it and ordered a re manufactured Bosch alternator for 85 bucks with free shipping from California shipped to New York and should arrive today or Monday. I get updated text messages to let me know where along the way the alternator is on route with USPS. Although your videos are very informative, it is like watching a silent movie and any narration you make before and after the procedure would help as viewers can hear your reasoning. You obviously know a real lot! The stuff in between when you fast forward because takes time to remove so understood not to talk. Thanks.

awsome job!

Unlikely you're still reading comments, but, thank you for this video. Commentators speak of the ease of buying a new/rebuilt alternator. But, not so easy when your 'alternator' is a 1959 Mercedes dc generator, .... with no electric/machine shop within reach to press off seized bearings. ..... & said refurbished generator online at premium $$$.

this is confirmation, they can have my blasted 168 dollars

I have seen geat jobs of this kind made in your country !!! While in my country they tend to change the whole alternator without hesitations.

omg I make these for a living and I lost tract of the things that will cause your repair to fail prematurely. use lube on black bearings, don't beat on the rotor etc etc. Sorry I'm so used to making them it erks me to see certain things.

Great video, my favorite part was the end🐶🐾

by the time you do all that, basically you just bought yourself a new alternator from autozone with 2 or 3 year warranty labor wise. i dont think its worth nearly cutting off you fingers with a cutting tool.

Great video. I might have to do this one day at sea so I am glad to see what it takes to accomplish the task. I do have a gear pullers and a rebuild kit but this video showed me that it can be done. Thank you.

this is not the right way to do it

vary professional work plus i love the way you marked the clock position good work

I'll just buy a new one. Way too much work to fix. Not worth time

Nothing better that a nice cold alternator on a hot summer day

ovo je smešno..

Nice Job! I'd say a nice editing job. Quick and efficient without all the talking or hype! Thanks! ;)

or you can just buy a new alternator

There were a time when Parts were so scarce in some places that everything had to be fixed not changed, now most ppl will just buy a new one and that's it, but recycling nowadays due to pollution it's the way to go, reuse and renew your stuff , plus it's cheaper, and all you need is some time, and some tools. Reuse, renew, and recycle!.

Thanks Michael, kind regards from South East England.👍

I was thinking,oh just somebody how change the bearings on the alternator, untill i saw that the guy is really smart, put the metal case into the oven and the bearing into the freezer,that's awsome. I will try that.

love the video ... shows you can still rebuilt the old alternator...

Very inteligent and tech savvy technician, excellent वर्क done without any hassles

Before the video was over, I had purchased a rebuilt alternator and had it installed. MUCH less trouble!

Great video just what i needed to sort my alternator. Cheers

What are you doing for the first few seconds starting at 04:08 ? It appears you're cutting into the bearing to get it off easier but a few seconds in around 04:14 it appears you might be sharpening or polishing the rotors on the unit? Or is that just an optical illusion

Nicely done, thanks.

One of these days I'll have to take mine apart, I think the brushes have seen better days.

Thanks! You helped me with this project, thanks again!

Thanks for sharing pal, ingenious problem solving. Very impressed!

Awesome Video man... Every thing in detail and no BS. And I can't believe how fast you work its like Bionic man. lol

good video, only concerns are why not use a bearing puller for the little bearing? and grinding next to the copper wires can create a contact between them and cause problems when u fire it up,possibly

An excellent demonstration

Excellent demonstration, thanks for the video.

Smart putting bearing housing in oven and putting the armature in freezer. An good way to get the other bearing easily on the armature shaft is get a pot and put cooking oil in it and put it on a stove burner, drop the bearing in it and heat the oil so the inner bearing race will expand and then remove it and it will slide right on to the shaft.

Thank you for sharing your skill now im gona go and fix mine😊

What did this alternator come off? Looks exactly like my Bosch on my mercedes. And where did you find the bearing specs? My alternator doesn't whine, but it feels scratchy when you spin it with or without the regulator attached. W203 Chassis.

It looks not too hard to do the job. However, the alternator bearings are too expensive. I checked amazon, advance auto parts, and ebay. The bigger one is cost about 25. Nowhere to find the smaller one. How much did you pay for the two bearings and where did you get them from? Thank you!

thank you for your sharing video, i have the same noise problem on my BMW E36,

Also, how did you determine the size you needed etc? Did you do this before taking off the alternator, or did you take it off, disassemble it, measure and then order?

Thanks for that video! It helped me immensely. I just replaced my bearings and there is the slightest grind noise when spinning the pulley by hand. Its so slight that its more of a grindy whisper noise really. Is that normal or should the new bearings be silent?

Do you really need to change both bearings? Only the first one is on significant load (the belt tension). The back bearing just rides along.

I have a question, "When you see white Sparks coming out from your alternator, what does that mean??! And I'm hearing a screeching noise from that area too. I have a new belt already and one new pulley for the belt

Hehe the Hoven-and-fridge technic again ! Good video, learnt something with it !

شكرا على المجهود المعتبر

i am Michael too............Bravo!!! Excellent work!!! Thank you Michaelovitch...... ;-)

Wagnor 2014 model h alternator me se noise ate h jyada repairing ke. Charge Kitna aa jyga

Great tutorial michaelovitch !! Many thank from Italy. Ciao.

Probably a dumb question but how do you know which replacement bearings to buy if you trash the original with an angle grinder?

What kind of oil is used at 7:00 mark, between the shaft and the bearing? Can a non detergent SAE 30 lubricating oil be used?

I would be too chicken to cut that bearing off! But the heat cold parts worked great nicely done thanks cheers! 😎💨

I like your bearing puller.

Nice, just did mine, all for angle grinding the inner bearing ring off, have used pullers before where you could only get to the outer ring and ended up having to do this anyway as they left it behind! Also all for changing the rear bearing, why would you risk having to do it all again and mine looked worse than the front! Thank You! Happy 2019

That alternator looks just like the one I have, the only problem is, I wish my back bearing stayed in the house like yours did. What’s your recommendation for getting it off the shaft without using a cutting tool? I have a small bearing puller and pulled the front one off with absolutely no problem at all, but the back one, it won’t fit inside enough to grab it. Everything always goes easy until that one thing. I’m sure that speaks for everyone else.