Got Silicone Grease???, Do you lube your wheel lugs? |
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Got Silicone Grease???, Do you lube your wheel lugs? |
JeffBowlsby |
Jan 2 2004, 10:38 PM
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#21
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914 Wiring Harnesses Group: Members Posts: 8,524 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
Volume 6, page 4.1-2/1 (where did these germans ever learn to number pages (IMG:style_emoticons/default/laugh.gif) ?) of the factory manual says under 'Wheel Change':
"Observe the following: 1. Coat ball surfaces of wheel bolts with an MoS(sub2) paste. (Type 914/6 has wheel nuts.)" What is this paste? I have heard previously it is silicone grease. Is that correct...I am not a chemistry guy... Not that I would ever buy any, much less look for any in the stores... (IMG:style_emoticons/default/wink.gif) but just on a whim...I went looking for 'silicone grease' at FLAPS. They had wheel bearing grease, synthetic grease, white (lithium) grease, red grease...but no silicone grease. When ever I have removed wheel lug bolts from my alloy Fuchs or Mahles, the bearing surfaces of the bolt and wheel are shiney...so there must be movement there. Does anyone else use a wheel lug lube like the factory manual commands? What kind, brand name, why, and where to get it...? Woulnt the lube prevent a necessary binding action (torque) between the bolt(nut) and wheel, potentially causing wheel loss? I know the lube goes on the bearing surfaces...not on the threads... Your thoughts...esteemed colleagues... |
TimT |
Jan 3 2004, 02:01 PM
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#22
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Dry threads allow galling, friction scatter and imprecise torque indications. Most procedures call for bolts with a coating of light machine oil, this of course is open for debate, just what is a "light coating" I dont have my ASTM procedures on this PC, but did find some info on bolted connections on the net, here and here. is some good reading if your trying to take a nap.
To really get precise torque/tension readings, you have to select a sample ( 3 or so) of the fasteners your using, and calibrate the wrench to them, using a tension indicating device. We dont have that luxury, or need that level of precison when tightening our lug nuts. A little extra oil, or a booger sized blob of anit-sieze wont change the friction between the nut and the bolt enough to affect the tension of the bolt that greatly. The fasteners on our cars arent stressed enough that a little extra tension would be harmful, and tighter is always better than looser. I doubt you could even tell the difference between dry threads and lubricated threads with a clicker style torque wrench calibrated in 5lb increments. (IMG:style_emoticons/default/beerchug.gif) |
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