2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 122Get this manual

2003+ Mercury Mariner 225 HP EFI 4-Stroke Service Manual, Page 122

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IGNITION
WARNING
Do NOT rotate the drive sprocket counterclockwise3 Using hexagon wrench, turn the timing belt tensioner clockwise to release timing belt tensionIncrease the force graduall