eTorque Bearing Replacement, Fixed Grinding Noise

[PurpleRT]

^ I think the issue is the availability of replacement alternator/generator thing from what I’ve read.. backordered for months leaving some people screwed.


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[Trooper4]

The Ram powertrain warranty covers the engine, transmission, and drivetrain for 5 years or 60,000 miles (whichever comes first), providing peace of mind against costly repairs due to defects in materials or workmanship.

 

[Driver]

MGU covered under 8/80 emissions warranty. Many dealers are unaware.

 

[Trooper4]

Isn't this covered under the emissions/hybred system, for 8yrs?

And 80k. He is at 88k

 

[TimKG]

I will say, the MGU is REALLY on there, probably because the long bolts were torqued pretty good and likely squeezed the aluminum snug.

Before anyone takes whacks at it, here's what I did because pounding at this thing probably isn't the best idea.
The following is MUCH safer and went really smoothly.

With all the bolts out, put some WD-40 on the hinge points where the long torqued bolts came out of.
Then with a curved pry bar, (see photo below) place it in the gap and push down to lift the side closest to you.
Mine pivoted on the opposite hinge point pretty easily with that kind of leverage and would only go so far with the air intake in place on the throttle body. If this happens to you, simply disconnect the intake from the throttle body and shift it out of the way.

The MGU has a friction fit threaded sleeve for the bolt threads that will back out but it's not necessary to do that for removal.
Mine came out when I was using the space as a way to separate the halves.
I had to then rock the unit back to it's original position a few times by reaching across the top and pulling it back toward me. The WD helped A LOT for that. I pryed and reset it a good 20+ times before that first circular alignment part came totally free (the part that wants to trick you into thinking it's a sleeve)
It got easy after that.
Take it easy be mindful of your pry bar position and you should have good success.

The MGU has to weigh a good 20 lbs so don't be surprised.

 

[TimKG]

Everything UpNorthEngineer documented in the original post is spot on! Particularly the resolver and reluctor damage.
The tolerances in there are tight. With that amount of failed bearing movement, this damage is totally logical. Hopefully it doesn't create significant issue down the road.

 

[TimKG]

I just want to thank UpNorthEngineer for being the trail blazer and posting this. Life saver!
I just finished my truck tonight and it's so smooth. A little patience and research goes a long way.
Thermal expansion and contraction with my carefully used heat gun and a $10 can of air duster to chill the shaft helped the bearing go on relatively easily.
Those of you out of warranty don't be afraid to give this a shot. Besides time, I'm only $30 invested.
I went with a Timken 6003-2RS-C3. Well see how long it lasts.
Best of luck everybody.

 

[1791]

Ford has and had i issue with the duel clutch trans in the focus. they knew it and sold the cars anyway thinking a fix would be found but a fix never happened internal documents were found in discovery for the class action reviled they knew all about the issue and pushed the cars out anyway. EXPOSED
kia's have main bearing issues they replace motors left and right turns out the bearing supplier was the issue.
i bet a combination or something similar is going on here.
till the cost of repair exceeds the cost of a legal battle nothing will be fixed. they will just throw a Band-Aid on it till you are out of warrantee then you are SOL.
it would be nice if they admitted some fault or found something to blame it on and had a updated MGU that has a better bearing or something. not everyone has problems so i imagine they have more than 1 supplier for the bearings that have issues and 1 of them suc or it's just a pis poor design.

 

[TimKG]

W

Ford has and had i issue with the duel clutch trans in the focus. they knew it and sold the cars anyway thinking a fix would be found but a fix never happened internal documents were found in discovery for the class action reviled they knew all about the issue and pushed the cars out anyway. EXPOSED
kia's have main bearing issues they replace motors left and right turns out the bearing supplier was the issue.
i bet a combination or something similar is going on here.
till the cost of repair exceeds the cost of a legal battle nothing will be fixed. they will just throw a Band-Aid on it till you are out of warrantee then you are SOL.
it would be nice if they admitted some fault or found something to blame it on and had a updated MGU that has a better bearing or something. not everyone has problems so i imagine they have more than 1 supplier for the bearings that have issues and 1 of them suc or it's just a pis poor design.

With all the bearing failure's it's made me wonder if bad bearing supply is the issue or the bearing is the weak link / sacrificial lamb of engineering that failed due to stresses of the unique system and odd tensioner setup.
We'll never know. I'm just glad bearing replacement was a task that was doable. Not that challenging after all. Take that Stellantis, who needs you!

 

[Cruzer60]

I honestly have no idea. I did try getting the front pulley off to take a look, but it didn’t want to budge. Since I had already found the issue I didn’t pursue getting to the front bearings. I would suspect it is larger due to the shaft size. I only replaced the rear bearing.

UpNorthEngineer, thanks to you I was able to take the MGU apart and I took it a step further and removed the front bearing also, I just ordered them from MCMASTER.
I got the same one you did for the rear #6661K86.
For the front I bought #4668K327 and they will be here in 3 days.
Again a Big Thank You!

 

[1791]

UpNorthEngineer, thanks to you I was able to take the MGU apart and I took it a step further and removed the front bearing also, I just ordered them from MCMASTER.
I got the same one you did for the rear #6661K86.
For the front I bought #4668K327 and they will be here in 3 days.
Again a Big Thank You!

they are asking alot from those bearings. i see why they fail. regular alternators are similar but they are under no where near the stress. still a proper QUALITY part should do the job.

 

[Huffz]

Thank you for the write up. I'll be doing it this week, and will be following it step by step. Much appreciated.

 

[frisby5]

Thank you for the write up. I'll be doing it this week, and will be following it step by step. Much appreciated.

How many miles on your truck ?

 

[Cruzer60]

How many miles on your truck ?

My truck is a 2020 and it has 95000 miles, I just finished the install and started it up with no issues or codes. I did not disconnect the battery for this fix. I spend a couple hundred plus my time and some banged knuckles. A lot better than tge $1600 that the dealer wanted for the parr alone.

 

[Driver]

I just read online where a late model ram owner with no mgu trouble yet, bought a new mgu for $900. He said he likes access to spare parts, especially ones that can ground your truck for 4 months. Plus you can always resell it later. Some on ebay asking $2000.

 

[chuckkortuem]

Thank you UpNorthEngineer!

I took my truck in last week due to the same humming/ grinding noise. They tried to tell me it was the belt tensioner so I told them to fix it. Three hours later the tech comes out and says he replaced the tensioner and belt but it made the noise worse! He put all the old parts back on and told me that it was the MGU after all. They told me it would be at least two months before they could get one in. He warned me not to go on any long drives because if the MGU fails totally I would be stranded. They will call me when it comes in. It’s the start of summer and I use my truck all the time to pull my boat. They refused to give me a loaner truck since my truck was still “drivable.” Apparently they are ok sending people out with a ticking time bomb.

I found this forum and it seemed straight forward enough to replace the bearing on my own. I tackled the job this morning and it went smooth. My bearing was still intact but was for sure on its last leg and was bound to fail any day. Took me about 2 hours total. I also broke one of the black plastic clip that holds the top electrical plug. They are super thin. The other side seems to hold it in fine. Put everything back together and started the truck and was happy to hear the noise is gone!

If you are having this issue and have a general level of mechanical skill don’t hesitate to give this a shot. This is just a temporary fix until my new MGU comes in, whenever that is. Again, thank you UpNorthEngineer!

 

[jkumm1]

I have a 2019 and just opened mine up today. Both bearings are different than any listed anywhere online. The front is a standard 25x62x17mm bearing with snap rings on both sides. The rear is weird. It's 17mm ID, 40mm OD, but the outer race is 13 mm wide, and the inner race is 10mm wide offset, flush with the outer race on one side. This one has a snap ring as well.

 

[Duece670]

Been having a noise on my 2020 and just pulled the belt hoping it would be a pulley or idler but those all sounded fine when spun by hand. The MGU was rough and noisey spun by hand so I believe I have the same issue. Bearing has been ordered and on the way as I need this truck for work and personal use. Question for those that have done it... Any issues since replacing the bearing and how long has it been? Since I use it for work, wondering if this is a temporary fix and I should just get a new MGU on order or if this seems to be a longer term fix?

Thanks to UpNorthEngineer for all your work documenting this for others!!!!

 

[Duece670]

Completed the process today and now its nice and quiet again. If I was to do it again, I would try find out what size the front bearing is and replace that too since your already that far. But, I was in need of the truck immediately.

Added: I must have caught mine early enough that I did not see any damage to the resolver and reluctor.

 

[Trooper4]

Completed the process today and now its nice and quiet again. If I was to do it again, I would try find out what size the front bearing is and replace that too since your already that far. But, I was in need of the truck immediately.

Added: I must have caught mine early enough that I did not see any damage to the resolver and reluctor.

Cruzer60​

got the #6661K86 for the rear
For the front the #4668K327