Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 220Get this manual
GEAR HOUSING
7Lubricate drive pin with 2-4-C wTeflon Marine Lubricant and place into flat of shaft as shownInstall water pump impeller over drive pin95
2-4-C With Teflon (92-825407A12)
aDrive PinWater Pump Impeller 8Apply light coat of 2-4-C wTeflon Marine Lubricant to the inside of the water pump impeller insert9While rotating drive shaft clockwise, push down on water pump housing to cover impeller guiding water pickup tube into seal10Secure water pump housing to gear housing with four bolts and washersTorque bolts to 70 lb-in(8 Nm)95