Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 4Get this manual
Cleanliness and Care of Outboard Motor A marine power product is combination of many machinedhonedpolished and lapped su rfaces with tolerances that are measured in the ten thousands of an inchWhen any product component is serviced, care and cleanliness are importantThroughout this manua lit should be understood that proper cleaningand protection of machined surfaces and friction areas is part of the repai procedureThis is considered standard shop practice even if not specifically statedWhenever components are removed for service, they should be retained in orderAt the time of installation, they should be in stalled in the same locations and with the same mating surfaces as when removed