Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 252Get this manual
Trailering Outboard AWARNING
Excessive engine trim angle will result in insufficient water supply to water pump causing water pump andor powerhead overheating damageMake sure that water level is above gear housing water intake holes whenever engine is runningWhile operating "up" circuit, tilt ram will continue to tilt outboard to full up position for trailering
Trim "In" Angle Adjustment
AWARNING
Operating some boats with engine trimmed to the full "in" trim angle [not using trim adjustment pin (a)] at planing speed will cause undesirable andor unsafe steering conditionsEach boat must be water tested for handling characteristics after engine installation and after any trim adjustmentsIMPORTANT: Some boatmotor combinations, that do not use the trim adjustment pin (a) and are trimmed to the full "in" trim angle, will not experience any undesirable andor unsafe steering conditions during planing speedThus, not using trim adjustment pin may be desiredHowever, some boats with engine trimmed to the full "in" trim angle at planing speeds will cause undesirable andor unsafe steering conditionsIf these steering conditions are experienced, under no circumstances should the engine be operated without the trim adjustment pin and without the pin adjusted in the proper holes to prevent unsafe handling characteristicsWater test the boat not using the trim adjustment pinIf undesirable andor unsafe steering conditions are experienced (boat runs with nose down), install trim adjustment pin in proper hole to prevent unsafe handling characteristics