04-10-2024, 04:29 AM | #1 |
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SPACERS
Hi,
I have bought some spacers, Would it best to put some copper grease on the back of the spacers so they don't get stuck onto the hub?? Any other advice wold be welcome.. Many Thanks |
04-10-2024, 04:30 AM | #2 |
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04-10-2024, 04:42 AM | #3 |
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As above no - keep them clean/all mating surfaces clean
This ensures they're flush and you don't end up with wheel wobble etc... By all means put something like ceramic paste on the hub lip, to help things not to stick as much But absolutely nothing on the mating faces
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04-10-2024, 06:11 AM | #6 | |
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So you'll need to clean it all off thoroughly
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04-10-2024, 02:02 PM | #8 |
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This is interesting. Always thought bolts play crucial role in torque transfer.
And yes, no grease on mating face it needs to be super mated and parallel, concentric ridge is only where you can apply a bit of grease.
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Last edited by Allworth; 04-10-2024 at 02:08 PM.. |
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04-10-2024, 03:26 PM | #9 |
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The bolts merely hold the two surfaces together that transfer the torque.
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04-11-2024, 12:22 AM | #10 | |
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As I understand mating surface primary purpose is to give a wheel proper plane orientation.
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04-11-2024, 02:41 AM | #11 |
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It's 50/50. If the wheel bolts come loose, they don't all snap in half suddenly because the clamping force has disappeared. To say the bolts merely hold the surfaces together is too simplistic.
If you consider the huge shaft torque from the transmission's lowest gears being transmitted through a 82mm CV flange to a 18"+ wheel. That is nowhere near enough 'clamping force' to not slip. It's the bolts that do the majority of the work. |
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04-11-2024, 03:08 AM | #12 |
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To throw a spanner in the works...
While I have always subscribed to the current thinking of dry mating faces, having removed the wheels from my G31 540 the other week I noticed that there was a extremely light film of lubricant on the hub mating faces to wheel, you couldn't really see it but could feel it. Was a bit like the old treatment on brake discs when they came wrapped in paper to stop them rusting but less of it. The car was originally a BMW car and I'm the second owner, given the mileage when I got it at 10K and the service history, I would say that the wheels are unlikey to have been removed until I took them off. So having never had a brand new car myself, is this how they all come? If it is kind of throws the thinking out of the window? |
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04-11-2024, 03:26 AM | #13 |
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Maybe some kind of modern PTFE type dry lubricant? They stopped using that cosmoline stuff years ago, in favour of zinc primer. Probably due to skin health reasons.
Another train of thought is HGV and tractor wheel hubs. Very small actual hub mating surfaces, but lots of large diameter wheel bolts. |
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04-11-2024, 04:48 AM | #14 | |
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I know a few folk that use something similar that is liquid but doesn't go on thick like ceramic paste/copper grease etc https://www.amazon.co.uk/dp/B00295EF...v_ov_lig_dp_it
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04-11-2024, 05:12 AM | #15 |
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It's probably just post machining lubricant to protect the hubs whilst awaiting fitment to a car at the factory. If you buy a new bearing hub from BMW, it comes sealed in a bag with similar fluid on it.
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04-11-2024, 05:53 AM | #16 |
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Yup; same with the F.A.G. bearings for E39s etc - but generally that gets cleaned off unless BMW now leave it on
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04-11-2024, 11:38 AM | #17 |
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It can be preservative oil or an oily residue from some sort of coolant used when processing metal. Although regular brake discs are being cooked to a shape, there may still be some cutting where the oily coolant is used. Having it oily from a factory suggests that there is no direct harm in having an oily film coat, nor does it mean that it is any good, as oil can burn, attract dirt, and get into unwanted areas. But still a big no to a copper grease for this application, as it contains copper particles that may create an uneven surface.
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04-15-2024, 08:34 AM | #18 |
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I’ll come clean on this one. I used ceramic grease on my hubs to prevent seizing after ( the garage) struggled to remove them in order to adjust the handbrake. I did ask the question then and was told on the forum this was a no no.
However after several years I’ve not noticed an issue.
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04-15-2024, 09:42 AM | #19 |
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9 times in 10 you don't get an issue. Some people are just very petty/anal about it and always have to bring it up.
I've lubed up my wheels and bolts for over 30 years and never had an issue. I don't fancy salt welded wheels thanks. |
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04-15-2024, 10:12 AM | #20 | |
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Ceramic paste on the hub etc - but not the mating faces Been there/done that/chased the wobble
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04-15-2024, 12:04 PM | #21 | |
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As said before there is a method to make wheel non sticky without touching mating faces.
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04-19-2024, 04:51 PM | #22 | |
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