Mercruser 3.0 engine and outdrive help

G

green1320

Cadet
Joined
Jun 21, 2010
Messages
6
I just bought a 1991 spectrum bluefin boat with a merc 3.0 engine with a alpha 1 outdrive. When the boat is running the trim keeps falling down without touching the trim button. I notice that while running the speed of the boat slows down then i trim up and the boat picks up to the spped it was running. What would cause the trim to keep falling on its own? Also the motor will not go completly down while on the trailer so how can I change the sterndrive oil if the anti-ventilation plate is not level as the manual states? thanks
 
Bondo

Bondo

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Staff member
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Apr 17, 2002
Messages
71,461
Re: Mercruser 3.0 engine and outdrive help

Ayuh,... Welcome Aboard,....
The trim dropping could be either the pump, or the rams leaking internally...

Lower the tongue of the trailer to clearance the outdrive....
 
G

green1320

Cadet
Joined
Jun 21, 2010
Messages
6
Re: Mercruser 3.0 engine and outdrive help

Will the boat be to heavey to pick back up if I lower the tounge to the ground? It is a 20.5 ft alum boat. It has a wheel in the front tounge area but when this is lowered all the way down it is still to high to let the engine down. Also what would be the approx cost to have the trim falling problem looked at and fixed by a marina? Thanks
 
fat fanny

fat fanny

Lieutenant Commander
Joined
Feb 9, 2006
Messages
1,935
Re: Mercruser 3.0 engine and outdrive help

Place a floor jack in the center of the back most cross bracw of the trailer and jack her up and place jack stands under it use wood blocks to help get the right hieght make sure you block the swivle wheel on ther jack stand!
 
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