I came across your video while trying to replace bearings of my Bosch alternator. You were absolutely correct that the front steel shim is super hard to remove. I followed your instructions by shocking it, putting plenty of penetrating fluid and heating up the shim with a torch. Finally with two screw drivers and perseverance, the shim began to budge and came off eventually. The front bearing is relatively easy compared to the shim. Thanks for the tips.

In my old mechanic days, I used to put the bearings in the freezer for an hour or two. After they are frozen and shrunk, they just drop in with no resistance... Good video mate!

Really helpful video. Many thanks. I've been working today on a Valeo which was a pig because, as suggested, the inner retaining plate simply bends and tears when you try to press the shaft out. The bits of twisted metal are then wedged behind the bearing so you have to use a screwdriver through the front plate to bend the twisted metal out of the way so you can actually pull out the rotor shaft with the bearing still attached. I've done that but, as you can imagine, the bearing is well and truly corroded onto the shaft so tomorrow I'll be resorting to gas torch / vice / angle grinder. It's clear that Valeo do not want anyone to rebuild their alternators if they can help it. :-(

Fantastic set of tutorials! I've just ordered a repair set to replace brushes/sliprings/bearing(s) on my E60. Much cheaper than the £600 BMW want for a new alternator, plus I get to learn a new skill :) Cheers!

Very nice Video. Helped me plan my alternator repair (Audi Bosch). For those of You that have no press I choose a different approach. I warmed up the aluminum case of the alternator and then i was able to knock out the rotor together with the bearing :) I used a piece of wood and a standart hammer. Removing the shim was the biggest pain ;)

I got the front bearing off with a slide hammer. Great video you have done thanks.

Amazing inovation a lot of thought has gone in how to get around problems when the shaft has rusted on to the bearing centre 🖒

Worth mentioning here for the Bosch alternator, if the front bearing is not rusted or slightly rusted the main shaft could be removed just by tapping it out. Spray lots of penetrating oil before attempting this. Try this first before going through the lengths of grinding the front bearing out. As we can see during reinstallation of the bearing later the main shaft could just slide into the front bearing.

Excellent video, shows both WHAT TO DO and WHAT NOT TO DO and WHY TO DO IT.

Thanks for the idea with washers, I just broke my retaining plate and was wondering where to find it. Thank you very much for a detailed videos, you helped me a lot!

A perfect instructional video. Equal to the best on KZfaq. Very Good. Thanks

Thanks for all this advice , I,ll now attack the Valeo alternator I have , with educated confidence . Thanks a lot , I,ll get the bits from the online shop .

you are the man, I'm an alternator wizard now because of you mate

Hi mate, very good info. You were right about the Valeo bearing retention plate!

Master Mechanic. Thank you for teaching!

Found out how it is done. In my case i put the rotor into the freezer and the alternator housing in the oven at 80°C. After 20 minutes the rotor slided in like nothing :)

We all miss your great contributions on electrical repairs,good things don't last forever i guess

Elegancko dzieki ze sie podzieliles wiedza. Sub.

Cracking the bearing in the vise, are you serious?? that's *GENIUS* .

I like all your videos. Up to detail and as you say doable. Thanks.

If you change bearings in any alternator,you have to put a socket on the nut that holds the pulley,and give it a firm tap with a hammer. This is done to loosen the bearings in their casings after being assembled. If this is not done you are risking bearings seizing from the friction.

Cheers loads for sharing!! Really helpful and well presented/ explained!

Great tutorial and very informative. Thank you for sharing.

Thankyou, hopefully I can now cure my whiny Volvo!

I should have watched this video before attempting this !!! Tried hammering it out 😂

Hello! I am about changing bearings on Bosch alternator form BMW K series Motorcycle. It is small and all spaces are very tight. All ready the rear bearing while pulling it out, has destroyed the isolation of slip ring wires to rotor. I am going to fix it with epoxy. Your video has gave me a very precious insight how to remove the front bearing. Thanks a million, I am in the saddle back again!

..you are the bet mate! from now on, I'll buy from your shop to support you!!

damn good video, i was able the replace my volvo C70 Bosch alt because of you... it worked! awesome thank you!

I like this, very amazing. thank you so much for this brilliant skill

Great video Mark, thanks a bunch for all the video's and you got my business too.

Thanks for your attention to detail. Another great vid!

Great work WestronicsIrl, clear and very helpful.

Thank you very much for this very instructive video!!

You sir deserver an subscribe! :) Very good tutorials!

Great videos! It has helped me a lot with my Saab

very good video my friend thank you for sharing I am from Mexico..

Great video. Cheers from NZ.

Brilliant. Thank you !

Very good easy to follow

Awesome video! Thank you for taking the time to make it.

yea, 100% sure I'll never be able to do this. But nice video.

Got this done thanks to your helpful tutorials. Just wonder though why one of the replaced brushes is much more worn down than the other.

Why does the bottom slip ring wear more than the top one. Mine is the same as the one you are demonstrating. I expect that on my Yamaha as the brushes are in concentric circles so the outer one is travelling further per revolultion of the rotor.

Great work!!

Thankyou for your brilliant tutorials :-) You make it look so easy :-)

Care not to clamp stator in vice unless jaws are protected. Good ideas in removing bearings so as to prevent case stressing.

perfect explanation...

Good Job on this video!

Thank for this video.

Great Tipps

Hi very good video same question what do you mean by tap bearings at the end ??????

Classic example of alternator not being tapped after bearing change. Bearing will seize after so long,situations like that are the cause of the"bad quality bearing myth",over 20 years of my work and thousands of bearings I have changed Ive never seen a "bad quality bearing",just bad fitment. All what it needs is a slight tap in the shaft that the nut holding the pulley goes (put socket over it),and that's it,it frees the tension. P.S.:After being assembled ofc.

Thanks for the good explanation

Thank You for tutorial video .

thank you for the video, its very very helpful!

Would have liked to have seen the valeo done.

thank you for the video. amazing !

I wonder if cold and heat could help with the shim and the bearing.

Fantastic set of videos. This is why KZfaq is so good for the DIY mechanic. One question: I can't quite place your accent - is it Irish/German?

The best way to do that is to use a gas torch even you haven't removed your retaining washer. Heat up shaft and retaing washer to 2-3 minutes than cool it down with water immediately and you're good. Grinding process is the last thing to do...

good job and learning. thanks

Hi, great video, do you have one for the pulley removal for a Bosch alternator?

Great job! Thanks for uploading! Keep it up!

Шумахер вернулся.

Good job

best vid broo

Thanks man a lot!

Why didnt uou put the retainer ring back in, is it not needed ? Because Im doing the same version but i did not see you put that ring back in, i thought it serves a purpose ?

Hello. I have a vw golf mk3 1.6 petrol AEK motor with 101hp. Alternator model Bosch. I need to know what dimensions have those bearings inside because I need to change them, they failed and make a loud whining noise

I have a denso alternator 27060 (or 28120) and I need to replace the bearings. I found the 17mm ID x 47mm OD x 14mmDepth bearing but I don't know which end is it for? what's the bearing dimension for front and back for my alternator? 2009 camry 2.4L (non hybrid)

Bravo

SPECIAL PERFECT !

What would you do if you find out the bearing slips into the axis free,in and out...worn axis,any way to repair that or you need new rotor ? Or perhaps new alternator? Thnx

Good work man🖒

great video

Very helpful video. You know what you're talking about. However i have a problem and nobody can give me an answer. My valeo alternator (BMW E34) made a whistling noise at low rpm or high load. However, with alternator cables disconnected, the sound disappeared completely. I bought a rebuilt bosch but it makes the exact same sound! Hope you could give your opinion

Thank you

Thanks Martin! I was completely in the dark with removing the bearing on a Bosch KCB1 (0124325058), looking alot like the one you showed. I will attempt now...if I can get around working without a press and vice...

very good

I like a lot your videos, you could do someday the Ford Focus 2.0 tdci? thanks

Good

Nice vid thanks for sharing but i would like to say fee things about your bearing installation method if u don't mind. 1. The Grinded side of shaft that u remove old bearing seat will reduce seating of the bearing thrust. As the component is damage. The surface is not even and equal to each other. 2. Bearing Installation. U dont push bearing always within inner race as u said as if u fit wrong way u will reduce the thrust. Thrust should be installed chamfer way do drive shaft. If thrust is on inner race thats they the way u will push and it should direct upwards if its on outer thats the way u will push. Chamfer will be slightly different on each side almost not noticable be the right one is with thrust side. To avoid PRESS u can put bearing in FREZZER for about 30 min at -35 and cover to oven at 105o or so to 20 - 1 h. After that it will go on smoothly.

Really nice video but where can I buy parts for a MagnetiMarelli A127-45 or Lucas A127 alternator . I can't find parts anywhere in the US. The link to your eBay store is not working . Thanks !

hi this video was very educational , but my problem is i have a renault megane11to remove the clutch pulley is it left hand thread or right hand please can you tell me

cool ... well done

Good job.

Thank you, great video. (y)

v nice

Thank you. Thank you thank you thank you. :)

Sir shaft is so loose ..it is easily seen when you fit bearing and plate..does it affect it working ..

I have a problem doing this. The bearing doesn't slide off the shaft, instead the retaining plate starts bending. What would you do? Just keep pressing or are there other ways to do this? I don't see any..

Thankyou sir.

my brand new bosch 12 v alternator (vw bug) is charging erratic. jumps between 13, 10, 15, 8 volts. etc. could i suspect my regulator? the alternator gives current and spins during poli test aswell.

Thanks for the vid would this be the same on a 2003 vw polo 1.2?

At 12:49, I noticed that there is no longer a bearing spacer...what happened to it? Is the new replacement bearing wider to the point where no spacer is needed?

Thankyou.

Can you help i have a 2001 chevy tahoe 5.3 and im not sure what to do i am experiencing things were the battery gauge neddle will move when im in red light as well the oil gauge neddle and the digital odometer will dimmed and light up to original bright and back and forth also my emergency lights will get dimmed after a while and then my truck wont start. What could it be battery or alternator or something else?

thanks

SUPER

Interessante !