Rebuilt Torque Tubes Survey
02-01-2005, 06:47 AM
#1
Rebuilt Torque Tubes Survey
Here is a quick survey.
Please all owners with rebuilt torque tubes in their cars respond.
1) What bearings clearances were used for the rebuild : C3, C4 or C5 ? (or other ? Please mention even if you don't know the bearings type)
2) How many miles have you driven since the rebuild ?
3) How fine/bad has your torque tube been sounding/vibrating since the rebuild ?
Many thanks in advance for the feedback.
Please all owners with rebuilt torque tubes in their cars respond.
1) What bearings clearances were used for the rebuild : C3, C4 or C5 ? (or other ? Please mention even if you don't know the bearings type)
2) How many miles have you driven since the rebuild ?
3) How fine/bad has your torque tube been sounding/vibrating since the rebuild ?
Many thanks in advance for the feedback.
Last edited by Thom; 02-01-2005 at 03:59 PM.
02-01-2005, 07:18 AM
#2
Hi Thom I like the beer from Strasbourg, anyway I have had one rebuilt and the I rebuilt one myself. The one I had rebuilt has sealed bearings and was repacked my more high temp grease. I believe the clearance was c3.
The Porsche bearings as you know are sheilded, and I thought that was not the best until I spoke to a bearing specialist. He said if there is no danger of foreign matter getting in, like a torque tube I suppose then go for the sheilded ones. I said but they will run hotter. No in fact the opposite, the sheilded ones have less friction because the seal is not in contact with the race.
So when I rebuilt my other tube I used C3 sheilded bearings, I'm also rebuilding the gearbox, so I can't tell you what it is like, but the other has done 5 thousand ks and is fine. Hope this helps.
P.S the repairer who did mine gave me a two year warranty. No limit on the kms.
The Porsche bearings as you know are sheilded, and I thought that was not the best until I spoke to a bearing specialist. He said if there is no danger of foreign matter getting in, like a torque tube I suppose then go for the sheilded ones. I said but they will run hotter. No in fact the opposite, the sheilded ones have less friction because the seal is not in contact with the race.
So when I rebuilt my other tube I used C3 sheilded bearings, I'm also rebuilding the gearbox, so I can't tell you what it is like, but the other has done 5 thousand ks and is fine. Hope this helps.
P.S the repairer who did mine gave me a two year warranty. No limit on the kms.
02-01-2005, 07:52 AM
#3
Rennlist Member
Quick question if I may: what defines clearances in C3, C4, .. terms? When sourcing bearings for things like tensioner idlers, it is simply, for example, 6905DS (double shielded), etc. Clearance specification varience escaped me. TIA.
Sorry Thom, no TT experience .... yet!
Sorry Thom, no TT experience .... yet!
02-01-2005, 09:27 AM
#4
Greg - Hi, I like very much the beer brewed by Foster.
Anyway, you make an interesting point about shielded bearings.
As you say shielded bearings won't run hotter than a sealed one, but as far as I know the main issue with TT bearings is that they run out of grease with use. I understand that using sealed bearings with high temp grease (say up to 150°C) will have a longer duration than shielded bearings with which the grease can find its way out of the bearings when it goes fluid with heat.
I agree that bearings spinning "very" hot is an issue, but IMHO it is less of an issue than if they run out of grease, especially if the grease can stand high temperature levels.
Garth - Here is some info about bearings clearances.
Anyway, you make an interesting point about shielded bearings.
As you say shielded bearings won't run hotter than a sealed one, but as far as I know the main issue with TT bearings is that they run out of grease with use. I understand that using sealed bearings with high temp grease (say up to 150°C) will have a longer duration than shielded bearings with which the grease can find its way out of the bearings when it goes fluid with heat.
I agree that bearings spinning "very" hot is an issue, but IMHO it is less of an issue than if they run out of grease, especially if the grease can stand high temperature levels.
Garth - Here is some info about bearings clearances.
02-01-2005, 02:08 PM
#5
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Thom;
I used C5 bearings and have about 8,000km on the rebuilt TT. The TT has been perfect ever since the rebuild. Absolutely no issues...and I expect it will outlive the rest of the car.
Regards,
SteveCo in St. John's
I used C5 bearings and have about 8,000km on the rebuilt TT. The TT has been perfect ever since the rebuild. Absolutely no issues...and I expect it will outlive the rest of the car.
Regards,
SteveCo in St. John's
02-01-2005, 11:45 PM
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I used (shielded) C3 bearings when I rebuilt my tube. I've gone about 2,000 miles, including 3 DE's, since the rebuild. The tube was smooth and nice as soon as I rebuilt it, and has remained so.
