Trim Adjustment

[monstock2012]

Greetings to all boat finatics, new poster here! Recently i bought a 1979 Campion with a 120hp Alpha one Merc. The boat has the 3 botton trim arrangement. Does anyone know the sequence to adjusting trim?

 

[series60]

Re: Trim Adjustment

Is this what you are talking about? Adjusting the trim limit switch is the only adjustment and that is done at the outdrive.

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[spdracr39]

Re: Trim Adjustment

one will be trim down from all positions

one will be trim up from all the way down to say mid way up it will not do anything from mid way or higher this prevents you from trimming up to far while running the engine. Don't ever run it, even on muffs, above this position.

The last will be trailer up and will function from midway up to full up for trailering. Always remember to use this BEFORE pulling out of the water

 

[NHGuy]

Re: Trim Adjustment

One button is down. The middle one is trim, it stops at a predetermined height which is the highest you should have it while underway. The trailer button raises it to the upper limit.
I don't even run mine above the trim limit, though I have seen it said that you can do that at very low rpms.
To use the trim: For takeoff and lower speeds have it all the way down. For higher speeds raise the trim to lift the boat's nose. Less wetted area needs less power so as you raise the drive you will feel the boat pick up speed to a point. You will find that the trim requires subtle corrections to keep things working right, but that's part of the fun of it.
If you trim too high the prop can lose bite. Don't allow that because overspeeding the motor can break it. Also on many boats trimming really high will induce porpoising, a rythmic bouncing. If you get those results lower the drive to get things back where you like it.

 

[NHGuy]

Re: Trim Adjustment

I second the remark about raising the drive before pulling the boat out of the water.

 

[monstock2012]

Re: Trim Adjustment

Got er all figured out, thanks for your responses

One button is down. The middle one is trim, it stops at a predetermined height which is the highest you should have it while underway. The trailer button raises it to the upper limit.
I don't even run mine above the trim limit, though I have seen it said that you can do that at very low rpms.
To use the trim: For takeoff and lower speeds have it all the way down. For higher speeds raise the trim to lift the boat's nose. Less wetted area needs less power so as you raise the drive you will feel the boat pick up speed to a point. You will find that the trim requires subtle corrections to keep things working right, but that's part of the fun of it.
If you trim too high the prop can lose bite. Don't allow that because overspeeding the motor can break it. Also on many boats trimming really high will induce porpoising, a rythmic bouncing. If you get those results lower the drive to get things back where you like it.