1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 400Get this manual
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EXHAUST WATER SHUTTER 1 equipp with xh aus shut ter in exhau st tu be, it may make attl noise at idl eedThis nois is caused by loose fi between sh utt er shaft an suppo rt br acke an can be corr ecte