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Thread: When to use Moly grease

  1. #1
    HOPS! Diesel Dave's Avatar
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    When to use Moly grease

    Is there a rule of thumb as when to use Moly grease instead of normal or when NOT to use it?

    Same with white lithium grease?

    Can any of you gurus put the explanation of these greases into words someone unskilled in the industry like me can understand?

    e.g. drive shaft lube is Moly grease - why?

    Ta. Dave
    Last edited by Diesel Dave; 03-28-2010 at 05:00 AM. Reason: typo
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    One Track Mind dduelin's Avatar
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    Re: When to use Moly grease

    Moly grease is for high pressure metal sliding against metal situations hence its use on splines and pinion gears. In bearings where there are rollers or balls under the load regular fiber or lithium grease is used.

    Dave
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  3. #3
    Time for spring cleaning . . . BakerBoy's Avatar
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    Re: When to use Moly grease

    Dave, not a lot of good explanation online. Some info can be found here:
    [ame="http://en.wikipedia.org/wiki/Molybdenum_disulfide"]Molybdenum disulfide - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:MoS2chips.jpg" class="image" title="Molybdenum disulfide"><img alt="" src="http://upload.wikimedia.org/wikipedia/commons/thumb/0/0b/MoS2chips.jpg/200px-MoS2chips.jpg"@@AMEPARAM@@commons/thumb/0/0b/MoS2chips.jpg/200px-MoS2chips.jpg
    http://en.wikipedia.org/wiki/Lithium-based_grease
    http://www.allthingsmoto.com/forums/...question-4282/

    FYI, some dealers & mechanics assume that moly assembly lube (having only a few % moly disulfied, and a low temperature carrier 'grease') is equivalent to moly paste. Not true. Moly paste does not lose any appreciable amount of it's properties up to maybe 600 deg F because of both the moly disulfide properties and its relatively low fraction of the carrier 'grease'. Lithium doesn't provide the same properties as moly...it is has a lower temperature and lower load rating, and generally degrades quicker IIRC.

    There is a difference between a CV joint (like splines) and a roller bearing. Specifically a CV joint or spline does not have flow or relative movement of parts, but a bearing does. In a spline, the same mating surfaces always stay together. In a bearing, the balls & races move relative to each other and there is continuous flow and blending of lubricant and air. So a little grease haphazardly applied in a bearing gets spread to the friction surfaces. But in a spline the initial lubrication of each mating surface is all that the mating surface ever sees. Hence, the flowing properties of the grease or paste matters--when using a paste it is assumed that it is properly lubricated on every friction surface during assembly, and that the lubrication (paste) stays in place during the entire service life.

    So, no simple / clear answer.

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    John - 2004 ST1300A

  4. #4
    Natural Rider Enhancement Blrfl's Avatar
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    Re: When to use Moly grease

    (Everybody beat me to it, but here's more...)

    Quote Originally Posted by Schmoop View Post
    Is there a rule of thumb as when to use Moly grease instead of normal or when NOT to use it?
    The rule of thumb is that you use whatever kind of grease is called for in the assembly diagram in the service manual. Anything requiring grease will have a symbol that looks like a grease gun with one of the following in it:

    • GREASE - Multi-purpose lithium-based grease
    • M -Molybdenum disulfide grease with at least 3% moly content
    • MP - Molybdenum disulfide paste with at least 40% moly content
    • S - Silicone grease


    These are all described in the front of the service manual, just behind the table of contents.

    Can any of you gurus put the explanation of these greases into words someone unskilled in the industry like me can understand?
    Grease is a lot like paint: there are different formulations for different applications. For example, the latex paint you use on the walls of your living room would look very nice on the hull of your boat but wouldn't last an hour once you put it in the water. For boats, they have special epoxy paints that would look hideous in your living room.

    Multi-purpose grease is called for on sliding surfaces like axles. Moly grease and paste are used when the surfaces are under pressure; which you use depends on how much. You'll find silicone grease on the disc brake pins and the clutch master cylinder piston because it won't destroy the rubber boots that cover them.

    Needless to say, they're not interchangeable. If you put a general-purpose grease on the rear wheel or drive splines, the pressure will destroy it, the splines will have no lubrication and will wear out. Similarly, moly paste is very thick and gloppy and probably wouldn't do a good job keeping itself nicely spread out on a sliding surface like an axle.

    HTH.

    --Mark
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    Tor's Avatar
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    Re: When to use Moly grease

    To sum it up,,,if the service manual calls for Molybdenum Paste (rear wheel splines comes to mind) that's what you need to use, not some off the wall marine grease some dealers use.......on splines. I bought my jug here. 70% instead of 60%, but still good


  6. #6
    Your Humble Scribe Bones's Avatar
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    Re: When to use Moly grease

    When to use Moly grease? When she squeaks.
    Ride. Good.


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    1100 degrees is hot juddspaintballs's Avatar
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    Re: When to use Moly grease

    I lightly moly anything that looks like it needs lubrication with Honda moly, except for packing bearings. My SSMST is among some of the oldest STs on the site and it hasn't fallen apart yet using that rule of thumb. YMMV, but don't overcomplicate things.
    Jed Gregory
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  8. #8
    Tor's Avatar
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    Re: When to use Moly grease

    Quote Originally Posted by Bones View Post
    When to use Moly grease? When she squeaks.
    Might be a little on the late side by then.......

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