Monday, Jun 14, 2004 at 01:10
Leroy wrote:
"You then pumpem full of wheel bearing grease and you can see the spring compress that makes sure the grease is always pushing into the hub/bearings."
That might be a little misleading. You don't pump the whole hub cavity full of grease, just the area behind the bearing buddy diaphrame until the spring compresses a little.
The idea behind this contraption is this: should the warm hub be rapidly cooled, as when immersed into water, there would be a lower pressure formed inside which could suck water past the seal.
What the spring and diaphrame does is to compensate for this pressure drop so no pressure difference happens and, consequently, no water gets sucked in.
This assumes the rear seal is in good condition and the buddy diaphrame can move readily ( they can get stuck with grit but there is a special plastic cap available to prevent that)
All one does before dunking the hub is to
check if the spring is still compressed so it can do its job, if not pump in a little more grease.
Klaus
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