Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 128Get this manual

Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 128

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Camshaft 1 Inspect the camshaft for any of the following conditionsIf not within specification, or excessive wear, replace the camshaft Cam Lobe Length Cam Lobe Width Heat Discoloration Pitting Scratc