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4th Sep 2019, 01:21 PM #1
Oilite bearings in Electric floor fan
Hi guys,
I would like to explore the collective knowledge regarding oilite bearings.
My electric floor fan is a ROK 450mm 3 speed 3 blade model about 2 years old.
When this fan is switched on it sometimes emits a shuddering grinding noise which says to me- Ok! bearing problem.
I have disassembled the fan and found no visible damage to bearings or shaft and lightly oiled it, assembled it and ran it for a while but the noise returned.
I have checked the other obvious things like the balance of the fan, checked for bent blades and cleaned it
Also we have a free flying cockatiel- the flying fluff bomb who generates large quantities of fluff and dust, some of which ends up in the internals of the fan.
Would cockatiel fluff and dust affect the bearings?
I might add we have 2 other exact same fans in the house which the bird is not around much and they are fine.
Since the noise keeps coming back I drilled a hole in the back cover cap that encapsulates the rear bearing. This hole is just big enough to accept the straw on a WD-40 lubricant spray can. A squirt of this and the fan is good for a week. What do you say, can an oilite bearing lose its oil?
Thanks
Grahame
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4th Sep 2019, 01:38 PM #2Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
Hi Graham, at a guess it is a sintered bronze bush, if so I would remove and clean it.
Then sit it on your index finger and fill the bore of the bush with engine oil, then press your thumb onto the oil at the top and use pressure between your finger and thumb to compress the oil, this will push the oil into the pores of the sintered bronze and should be able to see the oil start to appear on the outside of the bush.
Cheers, shed
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5th Sep 2019, 08:34 PM #3
I'm using some cheap ebay 8x12x12mm suposibly sintered bronze self lubricating bushes at the moment for a real low speed job.
I left one in accidently when welding close by, then seen the oil running from it.
Was a bit surprised as they where only $5 odd for 16pcs and thought they would just be bronze of brass.
I will probably just chuck it out, but didn't know you could repregnate then with oil.
I'll give it a try just for curiosity sake.Using Tapatalk
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5th Sep 2019, 10:21 PM #4
Thanks Dave I will have a look for those bearings as I recall the bearing is 8mm bore.
Grahame
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5th Sep 2019, 11:32 PM #5
https://rover.ebay.com/rover/0/0/0?m...2F293009181787
You get 16 bushes, I've bought 2 lots so far, highly recommendUsing Tapatalk
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5th Sep 2019, 11:34 PM #6
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6th Sep 2019, 09:23 PM #7Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
Hi Dave, sintered bronze bushes don't always come pre lubed, years ago sintered bronze was often used in preference to bearings as they were/are cheaper than brgs and also a bush requires less space than a brg. Also be aware that if you buy sintered bronze rod and turn up your own bushes you will have to charge them with oil.
Most cars (and a few trucks) in the past used sintered bronze spigot bushes in the end of the crankshaft, the input shaft of the gearbox ran in it, so whenever you replaced the clutch you also replaced the bush while you were there.
Before installing a new bush they had to be charged with oil, the bushes that were too large to compress with your fingers were placed in a tin with a neoprene mat in the bottom, the tin was half filled with oil, when the bush was submerged in the oil and sitting on the mat you would press a sliding fit shaft into the bush (usually an old input shaft) and you could see the air expelled from the bush as its pores were filled with oil, then you would turn the bush over and repeat the process from the other end.
shed
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6th Sep 2019, 09:41 PM #8
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6th Sep 2019, 09:55 PM #9Most Valued Member
- Join Date
- Apr 2012
- Location
- Healesville
- Posts
- 2,129
You might might get away with not lubing them but the oil on a new bush might only be a packing oil, best to play it safe and lube them.
You always knew when you put your foot on a clutch and the spigot bush squealed that the bloke who replaced the bush last time didn't charge it with oil.
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6th Sep 2019, 10:26 PM #10
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8th Sep 2019, 12:25 AM #11
Hi Guys,
I was told that you soaked them in hot oil and then let them cool before taking them out of the oil. The idea was that the hot oil drove out the air and sucked in oil as they cooled.Best Regards:
Baron J.
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8th Sep 2019, 12:38 AM #12
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