Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 210Get this manual
Trailering Engine 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 runningOperating "Up" circuit will first move the two trim cylinders; see "Trimming Engine 'Up'," preceding When trim cylinders are fully extended, the tilt ram will continue to tilt engine to the full "up" position for trailering
Trim "In" Angle Adjustment
AWARNING