Quote:
Originally Posted by szymanski2oo1
To grease lubricant bearings properly do we have to remove the sheilds ... I've tried but not had any luck doing it ... Am hesitant to give the car a spray with either wd40 or gt incase the bearings have a different type of grease in them like a silicone based stuff ... My bro told me that wd40 can dissolve some greases and turn them into a sludge ...
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Bearings can only be cleaned out if at least one shield is removed. Your brother is right - WD40 will dissolve most greases and if that solution (sludge!) is not flushed right out of the bearing it will cause problems, not solve them.
Although dirt and debris gets into bearings seemingly easily, there's no guarantee it will get out just by pointing some jet of cleaner into the gaps in the seals. Always take the shields out to clean bearings.
Welshy, neither of them repel grime. The grime is fine anywhere except in the ball cage or between the balls and the races. Neither of these products possess the ability to stop grime getting into the ball cage or races - how can a film of oil a couple of microns thick made of hydrocarbons repel a piece of dirt tens of microns thick made of a hard material when it gets into a space too small for the dirt particle? It breaks through that thin film in an instant and does the damage.
As I said earlier, use GT85 in a clean bearing for lubrication and for the film of PTFE that will try to stop water sitting on the metal. Use WD40 to clean it out (although I like the Muc-Off idea for that - original!) and then dry it, lube it and use it. If the water comes down get the GT85 in there before racing.
You'll have your pet theories and carry on using them, so I hope some background is helpful. I don't bother with any of this - racing indoors means it doesn't rain!!
