Alb
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- May 11, 2021
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- MG5 SR PFL
As my MG5 is only a couple of months old I was quite surprised to see how much corrosion there was when I removed the rear wheels (it's nowhere near as bad on the fronts for some reason). This isn't oxidisation of the hub but galvanic corrosion caused by contact between the steel hub and alloy wheel.
Because I've caught it early, it cleaned up reasonably well using a soft metal brush.
If this were left unchecked you could well find future difficulty in removing the wheel and you might also experience run out problems if the wheel was unable to sit flat against the hub. The faying surfaces should have an insulating coating to prevent electrical interaction but that doesn't seem to have been adopted by MG (The wheels on my other car have this).
To prevent recurrence I applied a smear of copper grease to the hub:
and also to the wheel contact points:
This should be done sparingly as you don't want to get any on the friction surfaces.
I'd be interested to know whether others have seen the same thing.
Because I've caught it early, it cleaned up reasonably well using a soft metal brush.
If this were left unchecked you could well find future difficulty in removing the wheel and you might also experience run out problems if the wheel was unable to sit flat against the hub. The faying surfaces should have an insulating coating to prevent electrical interaction but that doesn't seem to have been adopted by MG (The wheels on my other car have this).
To prevent recurrence I applied a smear of copper grease to the hub:
and also to the wheel contact points:
This should be done sparingly as you don't want to get any on the friction surfaces.
I'd be interested to know whether others have seen the same thing.