FRONT BEARING : It is recommended that one of the shields be removed and that the bearing is installed with the shielded side facing the outside of the engine. For Boca Bearing's rubber sealed engine bearings however, it is recommended that you leave both seals on. The bearing is already filled with grease so it does not need the fuel to lubricate it. This also allows more fuel to get to the rear bearing and to help stop leakage through the front bearing.
REAR BEARING : For maximum lubrication, both shields may be removed from the rear (large) bearing. However, removing one shield will still allow the fuel/lubricant to flow through the bearing and this method offers the added advantage of providing protection to the chamber area by eliminating the possibility of any foreign matter or contaminants passing through. Either method is acceptable, it's really a matter of preference. If one shield is left in place, the bearing should be installed with the open part of the bearing facing the small bearing in front....more
