Pilot Bearing / Solid or ballbearing type"whats best to use" - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-05-2007, 09:13 PM
X711
 
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Pilot Bearing / Solid or ballbearing type"whats best to use"

Hi Guys, I am replacing a clutch anyway I removed the pilot Bearing
from the crank shaft but notice that its of a solid type as opposed to the new
Timken one I purchased, so my question is which one is better.

1 Timken ball bearing type
2 Original Solid Type "Non bearing type"

I could see the bearing type possibly causing a problem due to moving
parts, but the solid one has no moving parts so I am leaning to it instead.

Both are the same size.. I attach a pic so you can see what I mean.

btw the hack marks on the Original was before I got a bearing puller which is
a real handy tool for this type of job !

Thanks for your time.

X711
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Old 01-05-2007, 10:03 PM
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pilot bearing

My first choice is always the bearing.I have resolved noise issues in 4wd applications so I have been sold ever since .Some people have concerns if the bearing fails it damages the input shaft.In 30 years I have never seen a pilot bearing or bushing fail .Go with the bearing .Good luck
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Old 01-05-2007, 10:03 PM
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I would lean toward the solid one, only because I have never used the bearing type. Either way, make sure they are greased.
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Old 01-05-2007, 10:42 PM
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Poncho, I believe your right on this.. The Original one looked ok prior to my hacking. I think the bearing type is a weak link and would just hate for it to go out !

Over time the grease in the bearing type will disappear due to heat. a little bit
of grit could get in there and puff games up !, bearings get destroyed ..

Thanks...X711
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Old 01-06-2007, 06:54 AM
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Quote:
Originally Posted by x711
Poncho, I believe your right on this.. The Original one looked ok prior to my hacking. I think the bearing type is a weak link and would just hate for it to go out !

Over time the grease in the bearing type will disappear due to heat. a little bit
of grit could get in there and puff games up !, bearings get destroyed ..

Thanks...X711
personally i take the bearing over the bushing everytime... the bearing has a lip seal on 1 end to keep the grease in if installed correctly, and 2nd, i never grease a bushing, ull be pulling it back out in months if u do... the bushing needs to be impregnated with atf. ( u can actually see the fluid come out the sides. use ur finger to plug the center, take a cup with fluid and pour in hole till at top, then use ur thumb to press..) it will last either way with good install practices.
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Old 01-08-2007, 03:10 PM
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I bought a pilot bearing once and fit it to the trans input shaft just to make sure it was the right size and fit then proceeded to install it. About 3 days later and several missed races due to clutch failures, the bearing was found to be a one way bearing. I've used those kinds of bearing before but apparently this one was misslabled or something. I kept sticking my finger in the bearing and turning it and making sure it was still smooth and it always felt free. By mistake I found it. My headach was relived right then an there. 7 or 8 tranmission and clutch removals in two days! messing with a rather tempemental triple disk clutch at that. Bushing are good for me now. Just to stay away from that mess.
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Old 01-08-2007, 03:33 PM
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Bushings work just fine for most applications. To use the bearings properly, you MUST index the bell housing to insure the bearing and shaft are running true.

If you have any slight diflection, the bearing will be loaded wrong and will fail. Usually when they fail, they keep the pilot shaft turning so you have to get the tranny into neutral or you will stay in motion even with the pedal floored.
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Old 01-08-2007, 03:43 PM
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I have used only the solid bushings for over 40 years....and I never put any grease or lubricant on them and I have never had a problem.
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Old 01-08-2007, 04:45 PM
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Pontiacs and Chevy trucks had bearings from the factory. I've never had a bearing failure but I've replaced lots of bushings.
Bob
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Old 01-08-2007, 05:04 PM
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Bushings have provided millions of miles of trouble free operations. Lubricating is not an issue since all that I know of are made from a material I think is called oilite that has lubricant impregnated in it. My Bud, the master tool and die maker, made one for my old Bronco and it has been trouble free for years.

Trees
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Old 01-08-2007, 05:32 PM
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I think for most Applications the Bushings work just fine, but in almost all Trucks and Tractors you'll find a Bearing, and they usually provide hundreds of thousands (or hours) of trouble free miles-must be something good about 'em-
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Old 01-08-2007, 05:43 PM
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I have only seen 1 bearing break. Never have seen a bushing completly fail but they do wear and should be replaced when the clutch is replaced. I have never lubricated one as I beleive as above they are self lubricating. Always be sure the baring/bushing fits on the input shaft before re-assembly.
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Old 01-08-2007, 09:55 PM
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I've seen many bearings fail/sieze up... this wears out the pilot shaft of the transmission input shaft.

There were some repair kits out for certain applications...... I don't work on manual trannys as a rule though.

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Old 01-09-2007, 03:55 PM
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Remember that anytime the clutch is in or engaged with the tranny in neutral, the shaft and and crank are turning the same rpm. same goes for clutch out and in gear, that leaves the tranny in gear and the clutch in, would be the only time that bearing is doing anything but being a support. Basicly street light and stop signs. You can get alot of miles out of a car with few revolutions on that bearing or bushing.
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Old 01-10-2007, 08:20 AM
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I had purchased an autogear m22 from George (He manufactures them) and talking with him about the pilot bearing issue. He said the pilot bushing is fine. But! make sure it is not impregnated with steel. And how to tell the difference is if it sticks to a magnet, the bronze one won't. So I checked my replacement one and sure enough it stuck to the magnet and checked my old one and that one was bronze. So I had to do some hunting to find a new one. Hope this helps.
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