Mercury - MerCruiser Alpha One 300 Hour Maintenance Kit Precision Sterndrive Service Kit Marine-Ready Components 8M0147072. Overview. If you've spent any amount of time with an older MerCruiser Alpha One, you know the kind of loyalty those drives inspire. They're tough, familiar and surprisingly steady when you give them the care they deserve. There's a quiet confidence that comes from maintaining a drive that has carried families, fishing crews and weekend wanderers across the water for decades