If you click on this image and blow it up you'll notice some red paint. This paint is the weep hole. The oil seal is just slightly proud of the weep hole so when the water seal and spacer are installed on top it gets seated to the precise depth needed without impinging upon the bearings.


Before sliding the seal over the shaft it's a good idea to pre-lube it with some motor oil. I usually just tip a bottle of oil over, there right side up again, quickly and with the cap on, and this leaves enough oil on the underside of the cap to dip your finger into.


Before installing the pump on the motor it would be a good idea to squirt a little oil into the bearings with the pump sitting on its face. Gravity will bring the oil to the seal. Doing this will pre-lube it prior to installation. I would advise draining this oil though before installing it. This will prevent getting oil on the gasket. All you need is a surface film of oil to prevent a dry start.