5. Oil in the axle housing travels out to the end of the axle housing spindle. The outer seal blocks this oil from getting
into the hub, except where the spindle keyway provides a handy channel under the outer bearing.
6. That's where the cork insert does its job. It plugs the keyway under the bearing and stops oil from getting into the
7. Cork insert, NSN 5330-00-348-8365, is used on 2 1/2-ton trucks, while insert NSN 5330-01-133-7262, is used on the
5-ton trucks. Here is where it goes.
The cork insert is jammed under the bearing by the seal keyway tang when pressure is applied to the nut.
8. An alcohol evaporator bottle is added to the brake system on some 2 1/2- and 5-ton trucks as part of the winterization
kit. Keep alcohol in the bottle or it will melt. Big diesel engines get hot enough to soften, bend or crack an empty plastic
bottle, even in cold weather. Eyeball the bottle each time you open the hood to make sure it's two-thirds full. When you
add alcohol, always use the filler plug. Unscrewing the jar ruins the gasket.