1971 Johnson 40HP outboards Service Manual, Page 64Get this manual
Figure 6-25Tilting Friction
Figure 6-24Shift Lever Adjustment shift handle as required, tighten screws, and recheck adjustmentTIL TING FRICTION
The tilting friction must be enough to maintain motor in tilted position for beaching, rowing in shallow waters, etc but not enough to prevent the motor from tilting up in the event the lower unit strikes submerged objectTo adjust friction, tilt motor up as far as it will goThen tighten the friction nut on the stern bracket just enough so that the motor will remain in tilted pOSition, but can be returned to an upright pOSition with very little pressureSee Figure 6-25