Re: 100 HP Evinrude 2 stroke 4 CYL trim motor wont raise or lower
I'm not exactly familiar with 1980 year but probably similar to most others....First check each and every connection. Clean up any that look suspicious or the wires have corrosion under the insulation. Make sure all are clean and shiny and tight. Typical stuff.
Next you can run the motor wires directly to a battery, momentarily, to see if it moves, bypassing the relays and everything upstream from the actual motor. Reversing polarity at the battery should move the motor in the other direction. If this works, your issue lies in the relay box wiring, switch etc.....
If going directly to the battery yeilds no movement, no movement in one direction, erratic movement, your issue is down in the motor or pivot points.... or its binding on the tilt tube.
Yes, you should be able to lift it up and down by hand to see how smooth it is and if its able to actually tilt. You mentioned the "bleed" screw...Are you sure you are opening the "manual" release valve and not some other screw? That release valve only screws/unscrews a small amount, and are easily damaged. A small snap ring holds it in with an o-ring.