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-   -   Rear wheel bearings - Moly Grease? (http://www.risingsun4x4club.org/forum2/showthread.php?t=18728)

Corbet 11-03-2012 08:52 PM

Rear wheel bearings - Moly Grease?
 
Anyone know of a reason why I definitely should not use moly grease in my rear hubs/wheel bearings? The old grease poured out like water :eek: 157K and the first service on the rear axle.

Don't really want to make a trip to town tomorrow. I generally use the moly on the front wheel bearings without issue.

azcromntic 11-03-2012 11:05 PM

I thought the rear bearings are lubricated with the gear oil in the axle; no grease required...??? I could easily be wrong.

Corbet 11-03-2012 11:08 PM

Quote:

Originally Posted by azcromntic (Post 221413)
I thought the rear bearings are lubricated with the gear oil in the axle; no grease required...??? I could easily be wrong.

I could be too. I am yet to read the manual on the rebuild. I'm just assuming grease. But it would explain the low viscosity drain out.

coax 11-04-2012 12:02 AM

This happens when the inner seal fails and the bearings get washed out with gear oil. From my reading on mud it sounds like the gear oil is a better lubricant than the grease, so as long as it was sufficient quantity should be ok. Not sure about the use of moly on the bearings:confused: I just used regular wheel bearing grease on mine.

Quote:

Originally Posted by azcromntic (Post 221413)
I thought the rear bearings are lubricated with the gear oil in the axle; no grease required...??? I could easily be wrong.


powderpig 11-04-2012 05:57 AM

No it is not gear lube for the rear bearing, it is as Corey state. As for moly or not. If the grease is rated for wheel bearings it should be OK. You have tested it out on the front wheel bearing, and it should be all OK. Many Moly fortified greases are rated for Wheel bearing these days.
In the past, the moly was not small enough in the formulas and it could cause the roller bearing to seize on the race for just a moment. Then over time, the roller would get a flat spot and take out the race.

Corbet 11-04-2012 07:18 PM

Thanks Robbie, according to Valvoline the grease is rated for disc brake wheel bearings, chassis, suspension, and u-joints.:) http://www.valvoline.com/products/co...-oil/grease/65

Rzeppa 11-06-2012 06:03 PM

Quote:

Originally Posted by azcromntic (Post 221413)
I thought the rear bearings are lubricated with the gear oil in the axle; no grease required...??? I could easily be wrong.

That is true for Semi Floaters. Full floating rears like on FZJ80s and non-USA cruisers have a seal like the front that keeps the 90wt in the diff side and grease on the bearings. Full floaters use a pair of tapered bearings that are preloaded with a big nut just like the front, semi floaters like our USA-spec 40, 55s and 60 series (and FJ80s) use roller bearings which ride inside the seal and are lubricated with the same 90wt as the diff.

As far as Corbet's question, I have always used regular Valvoline red grease on my rear full floater bearings.

Corbet 11-06-2012 09:15 PM

I should have posted full float originally.

I ended up using my moly grease on the rear too.

coax 11-07-2012 09:22 AM

Quote:

Originally Posted by powderpig (Post 221418)
No it is not gear lube for the rear bearing, it is as Corey state. As for moly or not. If the grease is rated for wheel bearings it should be OK. You have tested it out on the front wheel bearing, and it should be all OK. Many Moly fortified greases are rated for Wheel bearing these days.
In the past, the moly was not small enough in the formulas and it could cause the roller bearing to seize on the race for just a moment. Then over time, the roller would get a flat spot and take out the race.

Does this extend to ujoints as well? I'd love to just be able to buy just molly grease and not worry about running out of one or the other.

Corbet 11-07-2012 11:39 AM

The Valvoline product I use is also rated for U-joint applications. I posted the link above. I have been using in in u-joints and the driveshaft slip joint.

I also prefer to just buy one product if possible.


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