Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 207Get this manual
GEAR HOUSING
3Install water pump insert (a) into water pump housing making sure to position locating
tab (b) of insert into slot (c) of housing4Install water pickup tu be seal (d)Lubricate 1.0of seal with 2-4-C wfTefion Marine
Lubricant
2-4-C With Teflon (92-825407 12)