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  #11  
Old 08-11-2017, 06:55 AM
tim2542 tim2542 is offline
 
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Location: Redding,Ca
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Quote:
Originally Posted by Steve Melton View Post
I've never cleaned mine. I inspect the race. If it's good, I inspect the bearing looking for any shiny flakes. Then I use a bearing grease packing tool and inspect the old grease that is forced out. If all is good, back in they go.

update: I'm Mike's shadow from above.
In my experience with tapered Timkens it's more likely the inner race that will fail first. The roller contact patch is smaller here, (convex/convex) and the speeds are higher (smaller dia.). This is the hardest one to clean and inspect also.
That said, it seems most of us are in there looking and repacking pretty often and things won't get too bad before you catch it on the rollers or outer race.
Tim Andres
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  #12  
Old 08-11-2017, 07:31 AM
BillL BillL is offline
 
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Location: Central IL
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Quote:
Originally Posted by Michael Burbidge View Post
I've read here that you shouldn't use a solvent. Simply pack with new grease until all the dirty grease is pushed out.

That's what I've done for three years now.

Michael
You are probably right, if there is no dust to get pushed in, that is a good way to just replenish the grease. If they were sealed, the synthetic grease would probably last the life of the plane anyway, so it is not grease, just cleaner grease we need.

If contaminated with brake dust or other dust, full on cleaning is in order. No use in making a grinding slurry.
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  #13  
Old 08-11-2017, 07:33 AM
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Plummit Plummit is online now
 
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Quote:
Originally Posted by Jrskygod View Post
100LL. Works great, readily available, dries fast, it's the all purpose cleaner. Probably not a good idea to smoke while using it tho.
Years ago when I was stationed at Ft. Polk, LA, I was rebuilding a VW engine using leaded gas as a solvent. My friend walked in the room smoking a cigarette, and I asked him to leave due to the fire danger. He laughed and bet me that I couldn't ignite gas with a cig. I lost that bet. A cig does not burn hot enough to ignite gasoline.

I have won several similar bets since then, but the down turn in smoking has seriously cut into my lunch money fund.

-Marc
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  #14  
Old 08-11-2017, 07:49 AM
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Mel Mel is offline
 
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Quote:
Originally Posted by Plummit View Post
Years ago when I was stationed at Ft. Polk, LA, I was rebuilding a VW engine using leaded gas as a solvent. My friend walked in the room smoking a cigarette, and I asked him to leave due to the fire danger. He laughed and bet me that I couldn't ignite gas with a cig. I lost that bet. A cig does not burn hot enough to ignite gasoline.
I have won several similar bets since then, but the down turn in smoking has seriously cut into my lunch money fund.
-Marc
BE CAREFUL!!!! While gasoline will not burn, even with an open flame, the fumes directly above the gasoline WILL!!!!
This is NOT something to play around with.
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  #15  
Old 08-11-2017, 07:52 AM
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Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
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Default Bearings and working with flammable liquids

I like to think I'm a pretty conscientious person when it comes to fire and chemical exposure after worked in petrochem mfg for 15 years and working on cars and planes for the last 35 or so years with no injuries requiring more than a band aid and a few choice expletives. But last winter I was doing some cold weather maintenance - wheel bearing inspection and grease, brake inspections, etc.

After removing the wheel and bearings, I tossed all the greasy parts in a plastic bucket and sumped some 100ll out of the plane in with it. Began sloshing it around to clean the parts. I think I got up to go get a brush and almost stumbled over the propane heater I had running next to me. Not sure how that didn't flash. Guess the cold temps kept the fuel vapors to a minimum, along with a little divine protection. Ironically/stupidly, I have a working parts washer about 30 ft away.

Just thought I'd share. Be careful, and think.
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Last edited by Low Pass : 08-11-2017 at 06:37 PM.
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  #16  
Old 08-11-2017, 07:58 AM
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Vern Vern is offline
 
Join Date: Jan 2005
Location: Peachtree City, Ga
Posts: 909
Exclamation Gasoline

In college I worked 40-60 hrs a week at the local FBO. One day I commented to the boss that the fueler had a cigarette dangling from his mouth as he fueled our newest C150. Boss said it would not ignite and bet a coke that he could put his cig out in the now-full fuel tank. I fell for the coke bet but stayed well back as boss poked his cig into the full tank.

But,even so, it's not for me!

Friend's garage and half a house burned up while he was changing out a car fuel pump.

My own hangar almost burned up when a resident RV was calibrating his fuel gages.

Static can be more of an ignition source than a lit cigarette ..

Ground wires, outside hangars only, proper containers, fire extinguishers handy, and great care when dealing with gasoline!
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  #17  
Old 08-11-2017, 08:28 AM
Gisnar Gisnar is offline
 
Join Date: Nov 2012
Location: Northern Nevada
Posts: 121
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Back to bearing cleaning:
WD 40 works well.
Really like Hoppe #9, like the smell also.
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  #18  
Old 08-11-2017, 08:36 AM
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DaleB DaleB is online now
 
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Quote:
Originally Posted by Plummit View Post
Years ago when I was stationed at Ft. Polk, LA, I was rebuilding a VW engine using leaded gas as a solvent. My friend walked in the room smoking a cigarette, and I asked him to leave due to the fire danger. He laughed and bet me that I couldn't ignite gas with a cig. I lost that bet. A cig does not burn hot enough to ignite gasoline.

I have won several similar bets since then, but the down turn in smoking has seriously cut into my lunch money fund.

-Marc
Dad told me about his first engineering job after finishing college. He was getting the shop tour from the foreman. The foreman had a tin of gasoline sitting on the floor of the shop, and every time they walked past it he'd light a match and flick it into the tin of gasoline. Every time he did that, the match hit the gasoline and was immediately extinguished. That happened several times... until the last time, when there was a whoosh and an impressive fireball.

The shop foreman's point was, just because you might get away with doing something unsafe for a while, it's still not safe and eventually it will blow up on you.

I cleaned wheel bearings with gasoline swirled in the bottom of a can or jar for years. These days I wipe out as much as I can with paper towels, and use mineral spirits instead. I just don't like the gasoline stink, and I don't use avgas.
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  #19  
Old 08-11-2017, 08:38 AM
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Plummit Plummit is online now
 
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Quote:
Originally Posted by Mel View Post
BE CAREFUL!!!! While gasoline will not burn, even with an open flame, the fumes directly above the gasoline WILL!!!!
This is NOT something to play around with.
I agree that's it's not something to play with - BUT - the way my friend proved it to me was he took a 1 gallon plastic bottle with gas in it, put the end over his lit cigarette, then proceeded to smoke the cig to the point that I could see the cherry glow through the plastic bottle! I stood on the other side of the room, but no fuel or vapor ignition occurred.....

In welding school after my Army stint I won a similar bet with a guy who tried to ignite gas in a cup and on a welding table with a cig. He even discharged 02 on the gas from an Oxy bottle! Something about the flash point of gas being above the temp of a burning cigarette.

So I asked my friend that originally taught me this why there are "no smoking" signs in gas stations? He smiled and reminded me that the object used to light a cigarette (lighter or match) would ignite gas. Duh! ;-)

~Marc
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  #20  
Old 08-11-2017, 04:55 PM
Christopher Murphy Christopher Murphy is offline
 
Join Date: Feb 2007
Location: colorado
Posts: 725
Default No gasoline gas fumes fan out on the floor accident waiting to happenp

In a previous life I worked in the wheel and tire shop at Ohare airport for my airline ( a big one) and I spent weeks cleaning and inspecting wheel bearings and we always cleaned, inspected, repacked the bearings. I did this for the 747 dc 10s , dc 8s 767, 727 ,737..

Side note..

I have over 22,000 hrs and Im betting Im the only guy who has changed a tire on all of those planes and been a Capt on some of them too..😁

Cm
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