re-packing motor fan motor bearings

I deal with old fractional HP fans and pump where the life must be
extended beyond what you'd usually do when replacements are still
available. Ages go from 15 to 30 years.
Around bronze and even steel sleeve bearings there's usually conical cup
of sorts to hold the bearing and, originally in some motors a type of
grease that over time dries up and leaves a brown powder that cannot be
reconstituted, even with fresh oil. It looks like old sawdust and turns to
powder when prodded at. I can pack oiled felt in place of this stuff, but
what is this material? Is there something better than scraps of felt to
keep those olive-shaped bearings oiled for as long as possible? The amount
of wear they suffer by the time they cook out and seize up is not good, so
they need even more oil than when they were new.
Reply to
Cydrome Leader
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Felt and 10W oil is the best I ever came up with. Used to use 3 in 1 now it's whatever full synthethic I have on hand.
Randy
Reply to
randy333
Just curious about 3 in 1. Does that stuff still gum up like old cooking oil? I haven't used it in years and warn people to not use any version of it on motors. My personal favorite over-engineered oil is Lubit-8. It's really good on small motors, and even works fine in small radial ball bearings with no issues. It does not gum up or dry out.
Reply to
Cydrome Leader
"3 in 1" is a brand name with different products. They sell an oil specifically for electric motors:
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They also sell the generic oil you're thinking of...
I've been using the electric motor version on my furnace blower motor and its belt driven squirrel cage for many years now without issue. Also in a big 20 inch fan I place in a window for overnight cooling. My can is very old, maybe 30 years. So I don't know how it compares to the stuff sold nowadays...
Reply to
Leon Fisk
lol, 20" box fans are sort of my test of oil. The problem is the new fans are so terribly made the plastic falls apart in about a year and the fan blades slip and fall off the motor shafts as they're so thin and poorly made.
Is your 3 in 1 in a blue can?
Reply to
Cydrome Leader
Yes, it is. Date in some info on back of can is 1994. Couple pictures, front and back here:
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I recently tried using some generic Hydraulic Oil in a small turbo fan. Similar to this:
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It worked well for a couple weeks and then seized up while in use. It is SAE 10 oil. Caught it before melt down. Back apart, used 3in1 from blue can and back running again. Needs a lighter oil or maybe a bit more play in the sleeve bearings. Pulled from neighbors trash bin a few years ago and was too stiff to rotate. Used 3in1 back then too, ran for maybe 5 years before needing attention again...
Reply to
Leon Fisk
Have had good luck with some stuff I have labelled as Duratrode as well asSyon TufOil. I also have a little tube of Chevron Handy Oil ISO15.
They are both very thin and I have used them on computer fans and all kinds of other small fractional HPmotors (and other fine apparatus)
Reply to
Clare Snyder
Thanks! Might have some TufOil around. I have some old Shell Handy Oil but was reluctant to try it. That little fan is actually pretty quick to take apart. Might be worth the effort to just experiment on it. Fan season will be winding down pretty soon though...
Was going to try some SAE 5w Synthetic motor oil when I get some. Randy already mentioned having good luck with Synthetic oils...
Reply to
Leon Fisk
On Tue, 14 Sep 2021 17:43:27 -0400, Leon Fisk wrote as underneath :
I also saw Randy's post, I never thought of using fully synthetic for thin instrument type oil! Has anyone tried any heat stress tests on FSynth in comparison to 3 in 1 type oil? 3 in 1 smells quite a bit so I would imagine would just disappear over time when it gets warm / hot in a motor bearing. C+
Reply to
Charlie+
I've been baffled by the Syon tufoil and lubit vs. what's sold by Fluoramics. I spoke with the fluoramics people and they claim the Syon stuff was counterfeit, which didn't really make too much sense as it was sold for years and years. I buy direct from the flouramics people in NJ. They moved to MN a few years back. I suspect they had a fallout with a custom packager at one point, but that's all just a guess. The old MSDS sheets on tufoil and lubit-8 are all over the place with what's really in the stuff.
Here's a syon MSDS for lubit-8
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And a more recent fluoramics one that's highly obscured, and 100% worthless like all SDSs these days
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I sort of what to know what sort of toxic anti-rusting agents I'm touching.
I can't locate the chevron handy oil stuff anymore. It used to come in those ridiculous pocket oilers with the shirt clip. It was a really nice, thin oil. It was perfect for small bearings, like you mentioned.
Reply to
Cydrome Leader
DCepends WHICH 3 in 1 you use. Saying 3 in 1 is almost like saying Shell or PenzOil (orwd40) these days.
Reply to
Clare Snyder

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