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To bleed out a Mercury 90 power trim, first, ensure the engine is off and the trim is in the full up position. Locate the bleed screw on the trim unit, usually found on the side or top of the trim cylinder. Using a wrench, loosen the bleed screw slightly and operate the trim up and down until all air bubbles escape from the fluid. Once the fluid runs clear without bubbles, tighten the bleed screw and check the fluid level, adding more if necessary.

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