1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 354Get this manual
2Check trim tab position as follows: aOperate boat at normal cruise throttle setting and adjust trim to optimum settingTurn steering wheel to left and right, noting in which direction wheel turns more easilybIf wheel turns more easily to left, then the trailing edge of trim tab must be turned to left (when viewing motor from behind)Reverse procedure if boat turns more easily to right WARNING
Core of each steering cable (transom end) must be fully retracted into cable housing before lubricating cableIf cable is lubricated while extended, hydraulic lock of cable could occur3With core of Ride-Guide steering cables (transom end) fully retracted, lubricate transom end of steering cables thru grease fittings (Figure 12) with Quicksilver 2-4-C wTeflonLubricate exposed portion of cable end with 2-4-C wTeflon4Lubricate pivot points and ball joints in link rods and coupler steering eyes with Quicksilver AntiCorrosion Grease or Corrosion Guard5Inspection and lubrication of steering head assembly (rotary or straight rack) should be performed once each year (by your Authorized Dealer) or whenever steering mount andor steering head are disassembled, or if steering effort has increasedLubricate with Quicksilver 2-4-C wTeflon