Tapered Roller Bearing Hubs--IT'S HAPPENING
#244
Hub Update:
2 weeks ago installed new bearings and seal packed with Mobil 1 460 monolith grease as recommended by the manufacturer. Adjusted as per instructed. Drove around a bit and checked for play. None found.
Ran a race day at Hallett (CCW) consisting of 2 practice sessions, 1 qualifying session, 1 6 lap race an 1 12 lap race. The 2 practice sessions were dry and the rest were wet.
After the 1st practice session, adjusted the drivers front about 1 mark. no play detected in the passenger front and it felt good. Checked for play after each session. Both sides felt good with no play.
This last weekend raced at Barber (CW) in a 9 hour and 7 hour endurance race. Ran most of the day on Saturday ~8 hours but had an issue near the end with an unrelated mechanical. Came in and checked hubs and they felt fine but the car was hot off the track. Went ahead and prepped brakes for the next day.
Started the race Sunday morning and on the pace lap felt the slightest of buzz coming from the left front hub. Ran it for a couple of laps to confirm that it was in fact the hub. Had to bring the car in and swap out the hub. 28 minutes in the pits Grrrrr.
Here is my question to the rest of you running these hubs, Are you supposed to disassemble the hubs after each session and reset them to zero play after each session or just check to see if they have any play?
2 weeks ago installed new bearings and seal packed with Mobil 1 460 monolith grease as recommended by the manufacturer. Adjusted as per instructed. Drove around a bit and checked for play. None found.
Ran a race day at Hallett (CCW) consisting of 2 practice sessions, 1 qualifying session, 1 6 lap race an 1 12 lap race. The 2 practice sessions were dry and the rest were wet.
After the 1st practice session, adjusted the drivers front about 1 mark. no play detected in the passenger front and it felt good. Checked for play after each session. Both sides felt good with no play.
This last weekend raced at Barber (CW) in a 9 hour and 7 hour endurance race. Ran most of the day on Saturday ~8 hours but had an issue near the end with an unrelated mechanical. Came in and checked hubs and they felt fine but the car was hot off the track. Went ahead and prepped brakes for the next day.
Started the race Sunday morning and on the pace lap felt the slightest of buzz coming from the left front hub. Ran it for a couple of laps to confirm that it was in fact the hub. Had to bring the car in and swap out the hub. 28 minutes in the pits Grrrrr.
Here is my question to the rest of you running these hubs, Are you supposed to disassemble the hubs after each session and reset them to zero play after each session or just check to see if they have any play?
#245
Tapered roller brgs should have a little play, don't keep adjusting it out. Pack your brgs, smear some grease on the races and add a little around the spindle in between. Adjust just to where the slack is gone then go 1 line tighter. Run the car and you should have a few thousands of play, leave alone as tapered rollers like a little play. My Dodge diesel manual wanted .008" on the rears. I wouldn't go that much, but need say .002 to .006 roughly, just so you have some. I've been doing it this way for 40 plus years and never lost a tapered brg yet.
#246
Tapered roller brgs should have a little play, don't keep adjusting it out. Pack your brgs, smear some grease on the races and add a little around the spindle in between. Adjust just to where the slack is gone then go 1 line tighter. Run the car and you should have a few thousands of play, leave alone as tapered rollers like a little play. My Dodge diesel manual wanted .008" on the rears. I wouldn't go that much, but need say .002 to .006 roughly, just so you have some. I've been doing it this way for 40 plus years and never lost a tapered brg yet.
Oh, not trying to sound like an *** or anything but your statement doesn't make sense to me..."Adjust just to where the slack is gone then go 1 line tighter" and "you should have a few thousands of play, leave alone as tapered rollers like a little play" don't really go together unless you are assuming that they will loosen up after you tighten them.
Thanks
#248
Hub Update:
We think we have found the reason for the bearing failures. We have constructed what we believe might be a solution.
Tested for approx. 4 hours today. Bearings appear good. Going to clean, inspect and repack.
We have a double 8 hour race in 3 weeks so should be a good test to see if we have a solution.
We think we have found the reason for the bearing failures. We have constructed what we believe might be a solution.
Tested for approx. 4 hours today. Bearings appear good. Going to clean, inspect and repack.
We have a double 8 hour race in 3 weeks so should be a good test to see if we have a solution.
#251
I would guess around 10 hours so far. Now that I'm 74 I do mostly track days, some open track ones where they see 40 to 50 mins. at a time, but have been racing since 16 yrs old. I mentioned Thunder Hill as one of your above post mentioned these are probably fine for track day guys, but not endurance racing, I would say 25 hrs qualifies as endurance.
#252
I would guess around 10 hours so far. Now that I'm 74 I do mostly track days, some open track ones where they see 40 to 50 mins. at a time, but have been racing since 16 yrs old. I mentioned Thunder Hill as one of your above post mentioned these are probably fine for track day guys, but not endurance racing, I would say 25 hrs qualifies as endurance.
Also, to your point on tapered bearings liking a little play I submit the following chart showing that actually just the opposite is true, courtesy of General Bearing Corp.
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#253
Do what you want. I have ran long races in hot weather many years with tapered roller brgs. You found one chart on the ole inter webb that states such, keep running them with no clearance and you well keep having the same issues. I well take my many years of actually doing it. It's funny that there is several hundred of these being run with no problems. I was just trying to help you but it seems you know better so have at it.
#254
Do what you want. I have ran long races in hot weather many years with tapered roller brgs. You found one chart on the ole inter webb that states such, keep running them with no clearance and you well keep having the same issues. I well take my many years of actually doing it. It's funny that there is several hundred of these being run with no problems. I was just trying to help you but it seems you know better so have at it.
Oh, there are a number of folks having issues with these hubs. My guys are in Indy right now talking with them at the runoffs. It's not like we are the only ones having issues. We are just trying to find a solution.
#257
Tapered roller bearing is composed of an inner ring, outer ring, and tapered rolling elements. Thanks to the geometry of their design, tapered roller bearings can withstand combined loads. The rollers are guided by contact between the large end of the roller and a rib on the inner ring. It duplicates the original part in outside dimensions and appearance, but has added the reliability of tapered roller bearings.
#259
Tapered roller bearing is composed of an inner ring, outer ring, and tapered rolling elements. Thanks to the geometry of their design, tapered roller bearings can withstand combined loads. The rollers are guided by contact between the large end of the roller and a rib on the inner ring. It duplicates the original part in outside dimensions and appearance, but has added the reliability of tapered roller bearings.
Tapered roller bearings have tapered inner and outer ring raceways as well as tapered rollers. They are designed to accommodate combined loads, i.e. simultaneously acting radial and axial loads. The projection lines of the raceways meet at a common point on the bearing axis (apex point A, fig. 1) to provide a true rolling action and therefore low frictional moments during operation. The axial load carrying capacity of tapered roller bearings increases with increasing contact angle α. The size of the contact angle, which is usually between 10° and 30°, is related to the calculation factor e (→ product tables): the larger the value of e, the larger the contact angle
Last edited by bahurd; 02-15-2018 at 11:14 AM.