lithium vs. moly grease, u joints, BMW R100GS
in [Tech]
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From: Rob Kleinschmidt on 26 Nov 2008 18:04 On Nov 26, 2:18 pm, Mark Olson <ols...(a)tiny.invalid> wrote: > Rob Kleinschmidt wrote: > > 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 ? > > My own totally unscientific take on this, is I am starting to > favor a high quality grease with some Moly added. I used to believe > in the Honda Moly 60% Paste but if it's too dry it doesn't seem > to work as well as a grease which tends to flow a little better. > > http://www.hondapartsworld.com/moly60paste.aspxhttp://www.lubriplate.com/pdf/pds/3_21%203000%20Series.pdf 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.
From: frijoli on 26 Nov 2008 21:37 Claude Hopper wrote: > Rob Kleinschmidt wrote: >> >> Anybody have any opinions on this ? > > > grease is grease. > 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. Clay
From: Mark on 26 Nov 2008 22:47 In article <19adc0b8-8f39-4d3f-a5ff-6223f611a573 @r40g2000yqj.googlegroups.com>, Rkleinsch1216128(a)aol.com says... > 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 ? 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 here. '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, http://en.wikipedia.org/wiki/Grease_(lubricant) http://en.wikipedia.org/wiki/Molybdenum_disulfide 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
From: . on 27 Nov 2008 08:28 On Nov 26, 7:47 pm, Mark <bo...(a)devnul.net> wrote: > '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, 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.
From: Claude Hopper on 27 Nov 2008 08:36
Claude Hopper wrote: > Rob Kleinschmidt wrote: >> 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 ? > > > grease is grease. > Actually graphite grease has the best friction resistance. -- Claude Hopper :) ? ? � |