lithium vs. moly grease, u joints, BMW R100GS

Discussion in 'Motorbike Technical Discussion' started by Rob Kleinschmidt, Nov 26, 2008.

  1. I've seen conflicting opinions on the appropriate U joint
    grease for shaftys. Currently I'm using Mobil1 synthetic,
    which I gather is a lithium based NLGI (?) rating 2 grease.

    Recently I noticed one rebuilder reccomending moly based.

    Anybody have any opinions on this ?
    Rob Kleinschmidt, Nov 26, 2008
    1. Advertisements

  2. Rob Kleinschmidt

    the fly Guest

    Been a long time since I rode and maintained a Beemer, but I'd
    be inclined to use a moly grease. Its load-bearing capcity is greater
    than lithium grease. That's why it's specified for use in ball
    joints, universal joints, etc.
    the fly, Nov 26, 2008
    1. Advertisements

  3. Rob Kleinschmidt

    ian field Guest

    Moly is sold as car wheel bearing grease in the UK

    ian field, Nov 26, 2008
  4. I use Honda Moly 60 for splines, and this generally seems
    to be accepted as a good spline lubricant.

    What I'm actually worrying about is a grease gun type
    lube for an aftermarket driveshaft with zerk fittings.

    This is the place I've been using Mobil1 synthetic grease
    and where Bruno, legendary driveshaft rebuilder,
    seems to be recommending a moly based grease.
    Rob Kleinschmidt, Nov 26, 2008
  5. Rob Kleinschmidt

    frijoli Guest

    Not really an opinion on the subject, but a true statement of little value.

    The best grease to use is one that meets better than the minimum specs
    of the bearing and is the most readily available.

    frijoli, Nov 27, 2008
  6. Rob Kleinschmidt

    Mark Guest

    Believe it or not, I found an article on EP grease on Wikipedia the
    other day. Lithium grease is based on a lithium soap and petroleum,
    where 'regular' grease is a calcium based soap and petroleum. There are
    other types of grease too, but those seem to be the usual ones used

    'Moly', or molybdenum di-sulfide is a 'dry lubricant' additive, not
    really a kind of grease. When metal to metal contact happens due to
    high loads, the moly lubricates and takes the wear - at least up to a
    point. Graphite is sometimes also used,

    Also IIRC, moly was widely used during WWII in Allied aircraft engines.
    If the oil supply was lost it gave more time for the engine to run
    before it totally siezed.

    Glad to hear you used a moly grease, it's the right stuff.

    Mark, Nov 27, 2008
  7. Rob Kleinschmidt

    . Guest

    I would go for the moly grease, but graphite poses a special problem.
    It can actually *cause* wear, if the oil that it is suspended in
    departs the area
    you're trying to lubricate.
    ., Nov 27, 2008
  8. Rob Kleinschmidt

    Mark Guest

    Sorry, meant to also say that moly is preferred, but it got lost in the

    If a grease says EP on it, but not moly, I *suspect* that it's got
    graphite in it. For the relatively minor cost difference, why not use
    the best, especially if that's what's called for.

    Mark, Nov 27, 2008
  9. Rob Kleinschmidt

    . Guest

    Back in the late 1970's, there was a *black* motor oil called "Arco

    Owners found out the hard way what happens to engine parts when coated
    with graphite without an oil to keep it moving around.

    My problem with Arco Graphite came when the crankcase breather
    system got plugged up and the graphite bearing oil vapors came out the
    dipstick tube.

    It was aimed at the backside of the alternator wire harness plug where
    I couldn't see it, and it shorted out the field circuit so the battery
    was always dead...

    I replaced two voltage regulators and the alternator before I figured
    out that
    the Arco Graphite was causing the problem...
    ., Nov 28, 2008
  10. Rob Kleinschmidt

    frijoli Guest

    I had a car with cool stainless braided hoses. One of the hose came
    loose from the holder and slid up against the alternator fan causing a
    leak. I realized when the car burnt to the ground that gasoline was
    causing the problem. Nasty stuff!

    Apparently the plugged breather was the culprit?

    frijoli, Nov 28, 2008
  11. Rob Kleinschmidt

    S'mee Guest

    oh really...gee you hear all sorts of BS from old krusty every day. I
    must have been imagining it when I used to use spray on graphite
    lubricants for load bearing sliding parts. Yep straight graphite isn't
    a lying sack of slime.
    S'mee, Nov 28, 2008
  12. Rob Kleinschmidt

    ian field Guest

    oh really...gee you hear all sorts of BS from old krusty every day. I
    must have been imagining it when I used to use spray on graphite
    lubricants for load bearing sliding parts. Yep straight graphite isn't
    a lying sack of slime.
    ian field, Nov 28, 2008
  13. Rob Kleinschmidt

    . Guest

    Problem is, what is the purity of the graphite?

    I could show you where a vein of graphite is sandwiched between layers
    sedimentary rocks in Little Tujunga canyon...

    Graphite is naturally found in combination with much harder minerals,
    such as quartz and silica, and it's very hard to separate the grit
    from the graphite.

    The very soft graphite actually "marks" the grit. But there are
    processes for
    refining graphite.

    Lubricating a lock with low-grit graphite isn't going to hurt it, but
    running an
    engine with low-grit graphite after the carrier oil is gone will grind
    metal away.
    ., Nov 29, 2008
  14. Rob Kleinschmidt

    frijoli Guest

    Fact is LOCKS have that written on them for a completely different
    reason. If oil in an open environment didn't hold dirt, AND didn't get
    "thick" in cold weather it would say 7IO here. :)

    Ask a locksmith.

    Graphite can be used as a lubricant, but is NOT a GOOD lubricant. Hell
    water can be, and is used a lubricant in some applications, but I
    wouldn't use it in an engine. or my wheel bearings.

    frijoli, Nov 29, 2008
  15. Found a tube of RedLine CV 2 synthetic moly grease
    that I plan on using.
    Rob Kleinschmidt, Nov 29, 2008
  16. Rob Kleinschmidt

    CBXXX Guest

    CBXXX, Nov 29, 2008
  17. Dood stuff. Doesn't fit into a grease gun.
    Rob Kleinschmidt, Nov 30, 2008
  18. Rob Kleinschmidt

    S'mee Guest

    If it's grease it can be packed into a grease gun. How to you think it
    got into grease guns before the grease cartrdiges became available?
    Grease fairies?
    p.s. loaded more grease guns manually than most people have with
    S'mee, Nov 30, 2008
  19. I wouldn't be real optimistic about good results
    trying to squeeze moly paste through a zerk fitting.
    Great stuff for splines. Doesn't seem real appropriate
    for needle bearings.
    Rob Kleinschmidt, Nov 30, 2008
  20. Oh, so now it's not just 'graphite' that causes problems, bit 'a
    particular type of graphite'.

    The Older Gentleman, Nov 30, 2008
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.