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#1
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Pilot shaft bushing wearing fast and often!!
Hey Group,
My 84 CJ7, 258, T5, Dana 300 is about to get it's 3rd pilot shaft bushing in 15,000 miles. Seems like every 5000 miles or so, I start getting a weird grinding sound as I'm down-shifting and slowing down. I yank the tranny and the pilot shaft bushing is worn and allowing the input shaft excessive movement side to side, probably .015" to .020". I've placed a thick felt pad behind the pilot bushing soaked in 90 wt gear lube, I've put wheel bearing grease in, on and behind the bushing, I've replaced the input shaft on the tranny, I've looked for any obvious signs of mis-alignment in the drive train (no body or suspension lift). It's not a huge job to change the bushing out but I'm getting tired of doing it. I really just don't need the practice if you get my drift. Does anyone have any idea what may be causing this? Is there a pilot bearing made for 4.2 jeeps to replace the bushing? If so, who sells them? Any and all input appreciated, Thanks, Charles E. 81 DJ5L 79 CJ7 84 CJ7 92 Cherokee Yeah, they're all old and wore out! |
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#2
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Pilot shaft bushing wearing fast and often!!
Input shaft bearing? Bearings between the back of the input shaft and the
front of the mainshaft? Transmission to bell housing alignment? Bell housing to engine block alignment pins? How are you installing the bushings? If you hit them wrong they can be damaged. If this is a sintered brass bushing, then it is supposed to have something like engine oil soaked into it, probably the felt pad too. The only likely thing I can think of, is that you are getting new old stock bushings that have dried out in storage. Earle "Ervin Charles" > wrote in message ... > Hey Group, > My 84 CJ7, 258, T5, Dana 300 is about to get it's 3rd pilot shaft bushing > in 15,000 miles. Seems like every 5000 miles or so, I start getting a weird > grinding sound as I'm down-shifting and slowing down. I yank the tranny and > the pilot shaft bushing is worn and allowing the input shaft excessive > movement side to side, probably .015" to .020". I've placed a thick felt > pad behind the pilot bushing soaked in 90 wt gear lube, I've put wheel > bearing grease in, on and behind the bushing, I've replaced the input shaft > on the tranny, I've looked for any obvious signs of mis-alignment in the > drive train (no body or suspension lift). It's not a huge job to change the > bushing out but I'm getting tired of doing it. I really just don't need the > practice if you get my drift. Does anyone have any idea what may be causing > this? Is there a pilot bearing made for 4.2 jeeps to replace the bushing? If > so, who sells them? > Any and all input appreciated, > Thanks, > Charles E. > > 81 DJ5L > 79 CJ7 > 84 CJ7 > 92 Cherokee > Yeah, they're all old and wore out! > > |
#3
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Pilot shaft bushing wearing fast and often!!
The YJ comes with a bearing instead of a bushing. The bearing can be
made to fit, but the inside would need to be machined slightly to take the different tranny shaft diameter. Not a lot mind you, but it could be a bitch with a rat tail file.... The stock bushing uses 10W30 engine oil on a felt pad and should be soaked. I think the OP is maybe running them dry by using gear lube and grease. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Earle Horton wrote: > > Input shaft bearing? Bearings between the back of the input shaft and the > front of the mainshaft? Transmission to bell housing alignment? Bell > housing to engine block alignment pins? How are you installing the > bushings? If you hit them wrong they can be damaged. If this is a sintered > brass bushing, then it is supposed to have something like engine oil soaked > into it, probably the felt pad too. The only likely thing I can think of, > is that you are getting new old stock bushings that have dried out in > storage. > > Earle > > "Ervin Charles" > wrote in message > ... > > Hey Group, > > My 84 CJ7, 258, T5, Dana 300 is about to get it's 3rd pilot shaft > bushing > > in 15,000 miles. Seems like every 5000 miles or so, I start getting a > weird > > grinding sound as I'm down-shifting and slowing down. I yank the tranny > and > > the pilot shaft bushing is worn and allowing the input shaft excessive > > movement side to side, probably .015" to .020". I've placed a thick felt > > pad behind the pilot bushing soaked in 90 wt gear lube, I've put wheel > > bearing grease in, on and behind the bushing, I've replaced the input > shaft > > on the tranny, I've looked for any obvious signs of mis-alignment in the > > drive train (no body or suspension lift). It's not a huge job to change > the > > bushing out but I'm getting tired of doing it. I really just don't need > the > > practice if you get my drift. Does anyone have any idea what may be > causing > > this? Is there a pilot bearing made for 4.2 jeeps to replace the bushing? > If > > so, who sells them? > > Any and all input appreciated, > > Thanks, > > Charles E. > > > > 81 DJ5L > > 79 CJ7 > > 84 CJ7 > > 92 Cherokee > > Yeah, they're all old and wore out! > > > > |
#4
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Pilot shaft bushing wearing fast and often!!
Hi Mike,
I've never heard of using a "The stock bushing uses 10W30 engine oil on a felt pad and should be soaked." seems like you would be asking for a heck of a chatter. A disk is like brake shoes, we can't even leave body oil on them. God Bless America, Bill O|||||||O http://www.billhughes.com/ Mike Romain wrote: > > The YJ comes with a bearing instead of a bushing. The bearing can be > made to fit, but the inside would need to be machined slightly to take > the different tranny shaft diameter. Not a lot mind you, but it could > be a bitch with a rat tail file.... > > The stock bushing uses 10W30 engine oil on a felt pad and should be > soaked. > > I think the OP is maybe running them dry by using gear lube and grease. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > (More Off Road album links at bottom of the view page) |
#5
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Pilot shaft bushing wearing fast and often!!
The way I understand it, sintered brass bushings are meant to be
"impregnated" with oil, but as you say there should be no surplus. Earle "L.W.(Bill) Hughes III" > wrote in message ... > Hi Mike, > I've never heard of using a "The stock bushing uses 10W30 engine > oil on a felt pad and should be > soaked." seems like you would be asking for a heck of a chatter. A disk > is like brake shoes, we can't even leave body oil on them. > God Bless America, Bill O|||||||O > http://www.billhughes.com/ > > Mike Romain wrote: > > > > The YJ comes with a bearing instead of a bushing. The bearing can be > > made to fit, but the inside would need to be machined slightly to take > > the different tranny shaft diameter. Not a lot mind you, but it could > > be a bitch with a rat tail file.... > > > > The stock bushing uses 10W30 engine oil on a felt pad and should be > > soaked. > > > > I think the OP is maybe running them dry by using gear lube and grease. > > > > Mike > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > > 88 Cherokee 235 BFG AT's > > Canadian Off Road Trips Photos: Non members can still view! > > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > > (More Off Road album links at bottom of the view page) |
#6
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Pilot shaft bushing wearing fast and often!!
Oilite type bearings in an auto engine? They worked reasonably well in low rpm computer gear where the side load wasn't very high and the rpm range was low. Excess oil was never good news. Earle Horton proclaimed: > The way I understand it, sintered brass bushings are meant to be > "impregnated" with oil, but as you say there should be no surplus. > > Earle > > "L.W.(Bill) Hughes III" > wrote in message > ... > >>Hi Mike, >> I've never heard of using a "The stock bushing uses 10W30 engine >>oil on a felt pad and should be >>soaked." seems like you would be asking for a heck of a chatter. A disk >>is like brake shoes, we can't even leave body oil on them. >> God Bless America, Bill O|||||||O http://www.billhughes.com/ >> >>Mike Romain wrote: >> >>>The YJ comes with a bearing instead of a bushing. The bearing can be >>>made to fit, but the inside would need to be machined slightly to take >>>the different tranny shaft diameter. Not a lot mind you, but it could >>>be a bitch with a rat tail file.... >>> >>>The stock bushing uses 10W30 engine oil on a felt pad and should be >>>soaked. >>> >>>I think the OP is maybe running them dry by using gear lube and grease. >>> >>>Mike >>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 >>>88 Cherokee 235 BFG AT's >>>Canadian Off Road Trips Photos: Non members can still view! >>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 >>>(More Off Road album links at bottom of the view page) > > > |
#7
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Pilot shaft bushing wearing fast and often!!
That's what was used in pilot bushings for as long as I can remember. Low
duty cycle, heat, inaccessibility, and undesirability of excess lubricant were probably the main design factors. Maybe Volkswagen Bug was the first large scale production car to use a roller bearing type. First one I saw anyway. Earle "Lon" > wrote in message . .. > > Oilite type bearings in an auto engine? They worked reasonably well in > low rpm computer gear where the side load wasn't very high and the rpm > range was low. Excess oil was never good news. > > Earle Horton proclaimed: > > The way I understand it, sintered brass bushings are meant to be > > "impregnated" with oil, but as you say there should be no surplus. > > > > Earle > > > > "L.W.(Bill) Hughes III" > wrote in message > > ... > > > >>Hi Mike, > >> I've never heard of using a "The stock bushing uses 10W30 engine > >>oil on a felt pad and should be > >>soaked." seems like you would be asking for a heck of a chatter. A disk > >>is like brake shoes, we can't even leave body oil on them. > >> God Bless America, Bill O|||||||O > http://www.billhughes.com/ > >> > >>Mike Romain wrote: > >> > >>>The YJ comes with a bearing instead of a bushing. The bearing can be > >>>made to fit, but the inside would need to be machined slightly to take > >>>the different tranny shaft diameter. Not a lot mind you, but it could > >>>be a bitch with a rat tail file.... > >>> > >>>The stock bushing uses 10W30 engine oil on a felt pad and should be > >>>soaked. > >>> > >>>I think the OP is maybe running them dry by using gear lube and grease. > >>> > >>>Mike > >>>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > >>>88 Cherokee 235 BFG AT's > >>>Canadian Off Road Trips Photos: Non members can still view! > >>>Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > >>>(More Off Road album links at bottom of the view page) > > > > > > |
#8
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Pilot shaft bushing wearing fast and often!!
They call it a 'bushing oil wick' in my book. This wick gets stuffed
into the end of the crank, then the 'bronze' bushing gets pressed in. Once the tranny nose is inserted there isn't much room for oil to pass. It isn't like you fill the end of the crank with oil or something.... Mike "L.W.(Bill) Hughes III" wrote: > > Hi Mike, > I've never heard of using a "The stock bushing uses 10W30 engine > oil on a felt pad and should be > soaked." seems like you would be asking for a heck of a chatter. A disk > is like brake shoes, we can't even leave body oil on them. > God Bless America, Bill O|||||||O > http://www.billhughes.com/ > > Mike Romain wrote: > > > > The YJ comes with a bearing instead of a bushing. The bearing can be > > made to fit, but the inside would need to be machined slightly to take > > the different tranny shaft diameter. Not a lot mind you, but it could > > be a bitch with a rat tail file.... > > > > The stock bushing uses 10W30 engine oil on a felt pad and should be > > soaked. > > > > I think the OP is maybe running them dry by using gear lube and grease. > > > > Mike > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > > 88 Cherokee 235 BFG AT's > > Canadian Off Road Trips Photos: Non members can still view! > > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > > (More Off Road album links at bottom of the view page) |
#9
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Pilot shaft bushing wearing fast and often!!
Well, I'm going to continue to just stick a grease film into it
with my finger: http://www.billhughes.com/temp/clutch.pdf http://www.billhughes.com/temp/pilotBearingHaynes.jpg God Bless America, Bill O|||||||O Mike Romain wrote: > > They call it a 'bushing oil wick' in my book. This wick gets stuffed > into the end of the crank, then the 'bronze' bushing gets pressed in. > Once the tranny nose is inserted there isn't much room for oil to pass. > > It isn't like you fill the end of the crank with oil or something.... > > Mike |
#10
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Pilot shaft bushing wearing fast and often!!
Mine was still full of grease from using the grease method to pop the
old one out - figured that should liquify an/or get wicked in by the nose of the pilot shaft. 60K miles and no obvious problem. On Tue, 15 Aug 2006 00:07:51 UTC "L.W.(Bill) Hughes III" > wrote: > Well, I'm going to continue to just stick a grease film into it > with my finger: http://www.billhughes.com/temp/clutch.pdf > http://www.billhughes.com/temp/pilotBearingHaynes.jpg > God Bless America, Bill O|||||||O > > > Mike Romain wrote: > > > > They call it a 'bushing oil wick' in my book. This wick gets stuffed > > into the end of the crank, then the 'bronze' bushing gets pressed in. > > Once the tranny nose is inserted there isn't much room for oil to pass. > > > > It isn't like you fill the end of the crank with oil or something.... > > > > Mike -- Will Honea |
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