Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 20Get this manual
9Place propeller nut retainer over pin (a).Place block of wood between gear case and propeller and tighten propeller nut to 55 Ib.ft(75 Nm)aligning flat sides of the propeller nut with tabs on the propeller nut retainer10Secure propeller nut by bending tabs (b) up and against the flats on the propeller nut 4Before reinstalling spark plugs, clean away dirt on the spark plug seatsInstall plugs finger tightand tighten 14 turn or torque to 20 lbft(27 Nm)
Battery Inspection
The battery should be inspected at periodic intervals to ensure proper engine starting capabilityIMPORTANT: Read the safety and maintenance instructions which accompany your battery1Turn off the engine before servicing the battery2Add water as necessary to keep the battery full3Make sure the battery is secure against movement4Battery cable terminals should be clean, tight, and correctly installedPositive to positive and negative to negative5Make sure th battery is equipped with nonconductive shield to prevent accidental shorting of battery terminalsaRetainer PinsTabs