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Grease for repacking a new sealed bearing? #1633663 10/16/09 09:00 AM
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Blink7 Offline OP
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I will be installing new front wheel bearings on my car, and I would like to repack the new sealed bearing with a good grease to make them last longer. I was thinking Mystik high temp would be good for this. What do you suggest would be good?

Re: Grease for repacking a new sealed bearing? [Re: Blink7] #1633666 10/16/09 09:02 AM
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Steve S Offline
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No need to repack sealed bearings .

Re: Grease for repacking a new sealed bearing? [Re: Steve S] #1633673 10/16/09 09:11 AM
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Blink7 Offline OP
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Yes I know, but I want to make absolutely sure that the grease in the bearing is a really good one so that the bearing lasts for ev er.

Re: Grease for repacking a new sealed bearing? [Re: Blink7] #1633680 10/16/09 09:14 AM
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Steve S Offline
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It won't make a difference and the chance of messing up the seal is a big negative. There is a whole lot more to sealed bearing failure than just the grease.

Re: Grease for repacking a new sealed bearing? [Re: Steve S] #1633683 10/16/09 09:16 AM
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Familyguy Offline
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It really isn't worth the trouble.


2013 Kia Sorento EX
3.5L AWD
Re: Grease for repacking a new sealed bearing? [Re: Familyguy] #1633705 10/16/09 09:25 AM
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Quest Offline
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concur with what Familyguy and SteveS has to say: not worth the trouble, won't make a difference and you risk damaging the seal.

2 things that you should watchout for when it comes to sealed bearings:

(1) brand name: always go with the best possible bearing brands (NTK, SKF, Timken, etc.)

(2) be extremely careful when preloading the bearings. 90% of the bearing failures down the road are pretty much caused by improper loading/preloading of bearings during installation.

All others such as quality of grease, etc. are moot.


"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen
Re: Grease for repacking a new sealed bearing? [Re: Quest] #1633716 10/16/09 09:39 AM
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Kestas Offline
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Are you sure that you can easily take the bearing apart?... most don't come apart.

One big production issue we run into with some designs is that the seal doesn't always sit square in the assembly. The seal can easily get bumped. It may have been made that way, or it may have gotten bumped at the assembly plant. If the seal has any wobble to it, you can expect premature failue from water ingress.

Re: Grease for repacking a new sealed bearing? [Re: Kestas] #1633950 10/16/09 12:23 PM
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robshelton Offline
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Another problem is some greases don't play well with others. Mixing two greases may cause them to loose lubrication properties and your hopes of helping might even wind up hurting. I thought about doing exactly this on an old Accord I had but thought better of it. Good luck!


1993 Camry 2.2 AT 442k - How far will it go?
1999 F150 4.2
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Re: Grease for repacking a new sealed bearing? [Re: robshelton] #1634027 10/16/09 12:57 PM
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tom slick Offline
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you can overfill the bearings easily and the grease will pop out the seals. been there done that 'cause I knew better than the bearing manufacturer.

They come filled with a quality grease from the factory. I'd only think about repacking them if they had a lot of miles and you didn't have the $$ to buy new ones.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: Grease for repacking a new sealed bearing? [Re: tom slick] #1634090 10/16/09 01:49 PM
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Blink7 Offline OP
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Do you all really think they put in a grease as good as or better than something like Mobil synthetic, or Mystik High Temp in those bearings?

Re: Grease for repacking a new sealed bearing? [Re: Blink7] #1634110 10/16/09 02:06 PM
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tom slick Offline
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If its a quality bearing it has the proper grease in it. You'd be surprised how little grease is the proper amount.
I'll let Kestas give you the specifics, he's a bearing engineer.


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: Grease for repacking a new sealed bearing? [Re: Blink7] #1634115 10/16/09 02:11 PM
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Quest Offline
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Originally Posted By: Blink7
Do you all really think they put in a grease as good as or better than something like Mobil synthetic, or Mystik High Temp in those bearings?


LOL! You still not getting it, do you?

Truth to be told: properly manufactured/applied bearings with proper preloading, etc. can go a long way w/o the need of exotic grease. stock grease is designed to meet/exceed bearing manufacturer's designed/engineered specifics and never underestimate their ability to keep the bearings working.

Also something to note: unless you can pop the seals and wash out all the original grease packed in that bearing before pumping in some "exotic" grease of yours, otherwise, watchout for potential failures down the road due to grease incompatibility issues mixing original grease with wrong type of grease":

http://www.bobistheoilguy.com/greasechart.htm (thanks Molakule!)


For more info, consult Kestas for he is a bearing engineer.

Last edited by Quest; 10/16/09 02:12 PM.

"Internet discussion boards act as echo chambers for conspiracy dittoheads" A.Allen
Re: Grease for repacking a new sealed bearing? [Re: Quest] #1634129 10/16/09 02:24 PM
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lipadj46 Offline
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Leave it alone I bet you would do more harm than good.


2013 Honda Civic Si sedan 120k miles
Re: Grease for repacking a new sealed bearing? [Re: Blink7] #1634180 10/16/09 03:29 PM
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Ken2 Offline
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Originally Posted By: Blink7
Do you all really think they put in a grease as good as or better than something like Mobil synthetic, or Mystik High Temp in those bearings?
Better. Many sealed bearings use a polyurea base grease which is very long life, and also incompatible with all our usual greases. In addition, the chance of getting dirt into the bearing when you remove the seals is always present.

Leave sealed bearings alone.




Re: Grease for repacking a new sealed bearing? [Re: Ken2] #1636057 10/18/09 08:42 AM
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Kestas Offline
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Usually the greases packed in automotive bearings are adequate. For all the hundreds of warranty parts I've seen, not one has been returned because the grease per se was subpar or marginal. As long as you can keep the water and contaminants out of a bearing, the grease will do its job for the life of the vehicle. Grease is not the weakest link.

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