Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 118Get this manual

Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 118

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Valve Clearance Adjustment The valve clearance must be adjusted when the engine in cool to the touchAdjust the valve clearance when the corresponding piston is at the Top Dead Center (TDC) on compress

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