Originally Posted by
MechEngr
I generally don't like these very much as the failure mode of grease is for the oil fraction to be exhausted leaving the thickener behind, potentially plugging the inner grooves and the hole in the bushing that leads to it. Some perform the "push until some comes out" method but that new grease may cut a channel from the hole in the bushing to the outside, leaving the oil-starved thickener every where else. Notice that there are two, diametrically opposite holes in the Morgan advertisement. If one plugs then the grease thickener will prevent new grease from being distributed over roughly half the bearing.
This is a bushing failure mode I am familiar with and was what piqued my interest in the bushing in the photo.
Thanks all.