1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 776Get this manual
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MERCRU ISER POWER TRIM HYDRAU LIC CIRCUIT EXPLANATION HYDRAULIC upCIRCUIT (Figure S) When wer Trim contTolUp- utbu tton is pus hed, hydraulic pressure (indicated in dark had area)which is cr ated inUp