Originally Posted by stuartbull2
BTW and for general info to any one thinking about wheel bearings!. have previously fitted Bearing Savers to my wheel hubs having gone thro a number of sets of bearings (mainly due I believe to the amount of time the trailer can be in the water when I launch/recover as I tend to do it alone) These seem to be great,used them for a few launches last season and NO water entered the bearings,have popped a little grease in them once over the winter to re-presurise and seem fine so far.
The bearing savers purpose is to create something of a reservoir for contracting grease. You are *not* trying to pressurize the grease in the bearings.
General tips: 1) Do not pump the bearing savers completely full. Near-full is about perfect. Any more and you risk inverting the rear grease seal, which will cause leaks. 2) Allow your hubs to cool for at least 15 minutes or so after you trailer to the ramp. Dunking warm bearings will cause a lot of grease contraction, which is what sucks water into the bearings (discounting the bearings and seals that are falling apart from lack of maintenance.) 3) Make sure your bearings are adjusted properly. Bearings that are too tight will run hot, causing similar problems to #2 above.
Bearings that are in good shape should be able to be dunkable for quite a while longer than it takes to launch a boat, without water ingress.