Section 8 - Cooling System - Group 08 Water Pump Assembly - General Information M11 Page 8-7 Water Pump Assembly - General Information The M11 engine water pump is a centrifugal type pump with a phenolic impeller. The water pump is gear driven from an idler gear in the front gear train. The water pump contains an oil seal and a unitized water seal. The water pump bearing, gear and shaft receive lubrication from engine oil in the front gear train. The M11 engine uses both metric and U.S. Customary capscrews. In some cases, capscrews in metric and U.S. Customary threads are almost identical in appearance. Be sure to install the capscrews in the same location they were removed from.
Pipe plugs used in the cooling system are U.S. Customary dimensions. Fan Hub and Fan Idler Pulley - General Information The fan belt tension is adjusted by an adjusting screw and idler pulley in the fan hub support. The fan idler pulley contains two anti-friction tapered roller type bearings. The idler pulley end clearance is set properly by two bearing race spacers. Always replace the complete bearing set if any one piece requires replacement.