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#4755466 - 05/12/18 11:08 PM Re-packing wheel bearings by age?
JHZR2 Offline



Registered: 12/14/02
Posts: 41891
Loc: New Jersey
My 81 240D will be coming back out for family weekend use (beach trips) as soon as the rains pass.

It is all original. Original brakes (not hoses), and the car is set up so rotor replacement requires removal of the axle nut and re packing the bearings.

So the grease in there is original too...

It's a fairly closed environment, I guess. Not sure how badly the grease could oxidize over time without any real air exchange.

But should I consider re packing st least the front wheel bearings? How much is time a factor here?

Thanks!

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#4755488 - 05/12/18 11:56 PM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Reddy45 Offline


Registered: 08/15/08
Posts: 3025
Loc: USA
Original grease pack on a 1981 vehicle? Yeah I'd put in some fresh grease.

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#4755497 - 05/13/18 12:41 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
maxdustington Offline


Registered: 01/21/17
Posts: 868
Loc: Toronna
Keep it all original, baby.
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#4755508 - 05/13/18 01:32 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Nick1994 Offline


Registered: 02/19/13
Posts: 10285
Loc: Phoenix, AZ
Definitely repack them. Wear good disposable rubber gloves to repack the bearings, or get a bearing packer, either way wear gloves, it's messy. Watch a video on how to do it and get new seals, it's an easy job. Once you do one side, the other side will be twice as fast. Maybe 1-2 hours to do both sides?

Also learn how to tighten the axle but. Usually you don't have to tighten them down much, just a little snug until the wheel has some drag, then loosen and put in the cotter pin.
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2015 Hyundai Sonata 2.4L 80k Mobil 1 AFE 0w30 & OEM
2000 Toyota Camry 2.2L 228k Mobil 1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k Mobil 1 HM 10w40 & Fram Ultra

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#4755511 - 05/13/18 01:39 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Kibitoshin Offline


Registered: 04/19/16
Posts: 708
Loc: Oahu, HI
Seeing unitized hubs fail because of no way to service or lube them I wish for the old-school hub and spindle design.

Definitely repack them and change out the seals too.
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#4755575 - 05/13/18 05:54 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
About an hour each if all goes well. While you can adjust the hub nut by feel and it works its a little Mickey Mouse. hide MB has a spec for that you check with a dial indicator. It was set that way almost 40 years ago so I guess it works.

If time permits pull it apart and check everything out like caliper seals and splash shields and take care of anything not up to snuff. I would clean and repack with new seals at this age. USE MB green 2989005110 or a 265.1 approved grease, the yellow from back then has long been discontinued AFAIK.
Before anyone chimes in with just use valvoline or this or that one, MB has a spec and a short approved list, there maybe something to it or maybe not but its always safe to use approved products.
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ASE L1, Master. Deutsch Meisterbrief.

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#4755620 - 05/13/18 07:45 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
barkingspider Offline


Registered: 12/22/13
Posts: 2064
Loc: socal
Yes, repack w new grease
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#4755662 - 05/13/18 08:26 AM Re: Re-packing wheel bearings by age? [Re: Nick1994]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: Nick1994

Also learn how to tighten the axle but. Usually you don't have to tighten them down much, just a little snug until the wheel has some drag, then loosen and put in the cotter pin.


That would end up being a tiny bit loose.
You should see how we torque roller wheel bearings on large aircraft where the tire/wheel assembly is several hundred pounds. You would never believe they would be torqued so tight!

Too loose destroys rollers bearings FASTER than too tight.
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#4755664 - 05/13/18 08:27 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
OH, always always always always always tighten roller bearings while in motion.
_________________________
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4755710 - 05/13/18 09:33 AM Re: Re-packing wheel bearings by age? [Re: Linctex]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
Originally Posted By: Linctex
Originally Posted By: Nick1994

Also learn how to tighten the axle but. Usually you don't have to tighten them down much, just a little snug until the wheel has some drag, then loosen and put in the cotter pin.


That would end up being a tiny bit loose.
You should see how we torque roller wheel bearings on large aircraft where the tire/wheel assembly is several hundred pounds. You would never believe they would be torqued so tight!

Too loose destroys rollers bearings FASTER than too tight.


You cant compare aircraft to the type used on this car, the ones on aircraft are not adjusted by the center nut. Tightening the center nut does not alter the bearing preload.
A tight bearing will fail much faster than a slightly loose one.
MB cars spec .01 mm - .02 mm play at the hub.
Yes you can do it by feel but done right the bearings will go a very long time without service,
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#4755765 - 05/13/18 10:31 AM Re: Re-packing wheel bearings by age? [Re: Nick1994]
JHZR2 Offline



Registered: 12/14/02
Posts: 41891
Loc: New Jersey
Originally Posted By: Nick1994
Definitely repack them. Wear good disposable rubber gloves to repack the bearings, or get a bearing packer, either way wear gloves, it's messy. Watch a video on how to do it and get new seals, it's an easy job. Once you do one side, the other side will be twice as fast. Maybe 1-2 hours to do both sides?

Also learn how to tighten the axle but. Usually you don't have to tighten them down much, just a little snug until the wheel has some drag, then loosen and put in the cotter pin.


Ive done it before on other MB cars that Ive owned. MB has a decently rigorous procedure that doses grease by mass and sets the axle nut via dial indicator.

It works.

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#4755772 - 05/13/18 10:35 AM Re: Re-packing wheel bearings by age? [Re: Trav]
JHZR2 Offline



Registered: 12/14/02
Posts: 41891
Loc: New Jersey
Originally Posted By: Trav
About an hour each if all goes well. While you can adjust the hub nut by feel and it works its a little Mickey Mouse. hide MB has a spec for that you check with a dial indicator. It was set that way almost 40 years ago so I guess it works.

If time permits pull it apart and check everything out like caliper seals and splash shields and take care of anything not up to snuff. I would clean and repack with new seals at this age. USE MB green 2989005110 or a 265.1 approved grease, the yellow from back then has long been discontinued AFAIK.
Before anyone chimes in with just use valvoline or this or that one, MB has a spec and a short approved list, there maybe something to it or maybe not but its always safe to use approved products.


Agree to all.

So your standard recommendation of Mobil 1 for wheel bearings doesnt apply to MBs?

I was likely going to buy the packs of MB green unless there's something notably better...

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#4755805 - 05/13/18 11:06 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Kestas Offline



Registered: 06/04/02
Posts: 12392
Loc: The Motor City
I don't think there's anything special about the MB wheel bearing or the MB grease. This is just a wheel bearing, like any other double taper. Use you favorite wheel bearing grease and call it good. I use Mobil Infinitec. It's superior to Mobil 1 and readily available to me. Infinitec is specially made for wheel bearings but not popular in the industry because it isn't easily pumpable at manufacturing lines.

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#4755811 - 05/13/18 11:13 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Yah-Tah-Hey Offline


Registered: 05/26/14
Posts: 3478
Loc: Columbus,Nebraska
In power generation, we followed the procedures for mounting bearings found in the manufacturer of the equipment and/or the manufacturer of the bearing.

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#4755841 - 05/13/18 11:56 AM Re: Re-packing wheel bearings by age? [Re: JHZR2]
Trav Offline


Registered: 11/20/06
Posts: 19304
Loc: MA, Mittelfranken.de
Originally Posted By: JHZR2
Originally Posted By: Trav
About an hour each if all goes well. While you can adjust the hub nut by feel and it works its a little Mickey Mouse. hide MB has a spec for that you check with a dial indicator. It was set that way almost 40 years ago so I guess it works.

If time permits pull it apart and check everything out like caliper seals and splash shields and take care of anything not up to snuff. I would clean and repack with new seals at this age. USE MB green 2989005110 or a 265.1 approved grease, the yellow from back then has long been discontinued AFAIK.
Before anyone chimes in with just use valvoline or this or that one, MB has a spec and a short approved list, there maybe something to it or maybe not but its always safe to use approved products.


Agree to all.

So your standard recommendation of Mobil 1 for wheel bearings doesnt apply to MBs?

I was likely going to buy the packs of MB green unless there's something notably better...


I realize its like any other Timken style tapered roller bearing but like many German vehicles they have a lube spec. Like engine oil specs if we are to treat them as meaningless and say oil is just oil then sure you can use anything.
If it has no spec just has GL 2 I use Mobil 1 but I rather follow the spec if it has one than not if they are available.
Not for nothing but the original went almost 40 years so...

BTW Fuchs has a approved grease in tubes but I am not sure of the number. I will see if I can find it.
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