1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 16Get this manual
Trim Angle Adjustments TRIM "IN" ANGLE ADJUSTMENT
AWARNING
Operating lome boats with engine trimmed to the tull "'n" trim angle (not ullng trim adlustment boll) at planing speed will caulundesirable and or unsafe It.erlng conditionsEach boaMUST BE water tested for handling characteri,tlci att.r engine Installation and after
IThe trim adjustmen bolt is installed when the engine is shippedWater test the boat not using the trim adjustmen bolt If undesirable and or unsafe steering condit ions are ex perienced (boat runs with nose down)install trim adjustment bolt in proper holes to preven unsafe handling characteristics2If trim adjustment bolt is to be installedinstall thru determined holes and se:ure with locknutas shown in Figure 12DO NOT over tighten locknu tTighten just enough to remove play